Your "my way isn't the best way... try it your way.... try it a different way" advice is some of the best I've heard on any electronics channel ever.

Thank you so much. A very good and instructive lesson. You are the only one who made a linear power supply and tested it. I apologize for the translation, I use google translator. Himself from Russia.

Very detailed and informative comparison for Linear and Switching Power Supply. I was just confused in the same issue and now fixed by your video. Thank You so much my friend.

I ordered that power supply have not built it yet. It looks like I will not be using the switching power supply. I build linear power supplies for my CLASS A audio amplifiers so now it looks like I will be building a linear Power supply for my RIDEN RD6006 DC Power supply. 👍 Thank you that was the absolutely best in-depth review teardown and modification of this power supply I have seen to date. I just subscribed to your channel.

@JerryWalker001

4 жыл бұрын

Thanks, I have to say that the SMPS version works fine but on the occasions I have needed one of these supplies since I built them I have always reached for the linear version.

For those who are interested, here is my experience of building a linear version of this power supply from off-the-shelf components: I used a 230V / 2x24V, 500VA toroidal transformer from RS Online (which fits in the standard case snugly, but with enough room); 25A / 200V bridge rectifier on a 6 x 6cm heatsink and 4 x 4700uf 80V smoothing capacitors (in parallel). I was expecting an output voltage of about 68V DC, but after connecting everything up initially using croc-clip cables, I saw that the voltage from this setup was occasionally too high at up to 71V, causing an over-voltage error on the RD6006 (fortunately, it didn’t blow up). I’m in the UK and my meter was reading up to 250 volts from the mains, so I suppose that was the reason. Thanks to Jerry's video, and also because the secondaries on the transformer are on the outside, I took the plunge and unwrapped the transformer, unwound a few turns of the secondaries, re-soldered the output wires and then re-wrapped the tape (a right PITA but worked OK after I’d got the hang of it). Then I tried again and was getting consistently 67 - 69 volts DC. In the finished unit this is working fine, although surprisingly, in spite of the power overhead from the transformer, the unit can’t supply 6 amps at 60 volts. It can do 57 volts at 6 amps or around 5.5 amps at 60 volts, but the input voltage drops to a little over 60 volts so evidently it hasn’t quite got the ‘oomph’ required. On a sustained load near maximum power, the rectifier heatsink reaches 50 degrees C, which I think is reasonable. The transformer gets quite warm, but nowhere near too hot to touch. I don't have the tech to evaluate things like ripple and noise, but I'm assuming these shouldn't be too different from Jerry's results, so I'm pretty happy with the end result.

@JerryWalker001

3 жыл бұрын

Nice work, One reason I used 2 transformers instead of one was to reduce the droop under load as it effectively gives me a much lower source impedance. Also it sounds like your rectifier may be dropping quite a lot. I find that off the shelf transformers can be quite 'optimistically rated' and they do tend to have a fair amount of droop. This is another reason I prefer to wind my own. It still sounds like you are getting close to the max output. Note that I left my RD6006 connected to a 75V supply for several hours when I carried out initial tested. It shut down due to over voltage but was not damaged. If you are interested I will be posting a video on the 12A 60V version shortly.

@gman76utube

3 жыл бұрын

@@JerryWalker001 Hi Jerry, did you happen to measure the linear supply's Vout under load? I have a 200VA toroid (2x20V) that I was thinking about using, just to try it but the secondary windings will need to wired in series (measures 43Vrms, 60V DC) and the output Z measures 0.5 ohm. I'm fine with RD6006 output up to 50V and 3A or so. After running a sim, it seems that under load the output will droop quite a bit. I see that you used two xfmr, wired in series?

Incredibly useful series. Thank you! Informative and thought-provoking - perfect!

Love your work Jerry. Thank you for taking it slow so I can digest what you are trying to say. I am jealous of your mains voltage. I saw 248v on your Variac at one stage.The best I ever got here in my neck of the woods in Queensland Australia was around 243vac but recently my power company decided to drop the voltage (at our local substation) for everyone by 10volts. The reasoning is beyond me with my level of electrical knowledge but I was told it was to do with so many solar installations pumping power into the system. This is their way of reducing the effects. I do know that dropping consumer voltage helps the power company make more money - lower voltage - more current - more power used so that's a good incentive right there to drop the voltage. My voltage is down to 233vac and drops to 228v when I boil the kettle. My concern is that I am first off a largish transformer so the voltage I see at the power point is the best one can expect and customers toward the end of the LV run and further would suffer even more voltage drop, thus pay even more dead money. This is our country's way of dealing with renewable energy; charge more for it. We may be the lucky country but not in the top 50 for smart countries.

Great series. I've ordered one of the modules and case now. Thanks for your hard work.

It would be nice to see the new RD6006P with a linear back. It has two stages of conversion: switching and linear.

This was an excellent series, very informative, very well presented and very clear. This is really beneficial. Thanks so much.

I spent almost all day watching this series and did not even notice how quickly time passed. Thank you very much for the effort put into preparing this video because they are just great. Now I'm starting to watch your next video recordings (first electronic load) Best wishes

@JerryWalker001

4 жыл бұрын

Thanks, Pleased that you enjoyed the videos.

Brilliant series! Thank you so much for sharing your knowledge and ideas. Wow!

Really interesting series.....great work.

You really don't need to state that again and again, that you're not affiliated with the maker etc. Your whole viewpoint, approach, and the things you're highlighting simply screams honest objectiveness.

@JerryWalker001

4 жыл бұрын

This is a youtube requirement and it avoids any community strikes against my channel. You would be surprised how careful you need to be these days.

Well done!

I ordered a RD6006 a while ago. Initially, I wanted to use a switching power supply, but I think I will start looking for a linear supply now :)

@JerryWalker001

4 жыл бұрын

For a general supply I would certainly suggest that a linear version would be best but please note that a switching version still has it uses (just not as many in my opinion).

Awesome series, thanks for taking the time to do this and share it. I have an RD6012 and when I feed it with a 30V 10A switching supply the 6012 actually reduces the peak to peak noise that my power supply produces. I was wondering how much better it could be with a linear supply and you've shown this wonderfully! Have you done a side by side of the switching supply before and after the RD6006 to see how the 6006 effects the noise in your system? Better, worse, or the same?

i have a nice 2kva transformer i could repurpose for this conversion...ive got a RD6024 coming.... Jerry any ideas on the following: 1) Inrush current limiting 2) Using an emitter follower to limit the power supply voltage 70V so that we can run a slightly higher secondary voltage (say 50V) to ensure we can get the full 60V out of the RIDEN Btw I like your manner of teaching. I envy your patience with the transformer rewinding too.

Hi Jerry, thank you for this quite nice and very instructive series. Please, would you mind sharing the full schematics (even drawn by hand) of your linear backend?

Do you see and AC voltage between the 2 bolts used for the hold down plates? You will definitely see a voltage difference between the head of the bolt and the nut.

You should make a playlist for all the parts

eevBlog did a video on this test. The noise went down after *removing* the *balun!* from the ground lead to the scope!

Fascinating series! I wonder what the result would be like if you used the switching back-end AND the capacitor bank? Also, you removed the lid from the switching back-end if I recall. Leaving that in place may provide internal screening between it and the Riden PCB.

@JerryWalker001

4 жыл бұрын

It would most likely destroy the SM supply due to the very high peak currents. It would not make much difference to the noise and could even make it worse due to the higher impulse currents. The high capacity bank is only needed on the linear version because the supply is effectively 100Hz pulses but the SM supply runs at a much higher frequency so does not need large caps. I calculated the required capacity of the smoothing caps based on using a full wave rectifier on a 50Hz supply. Out of interest if you watch the series on the Ferroreasonant transformer you will see that you can use much smaller smoothing caps with this type of transformer because the supply waveform is closer to a squarewave rather than a sinewave even though it is still on a 50Hz supply. The important things are load and frequency. At high frequency large caps have little effect.

@john_hind

4 жыл бұрын

@@JerryWalker001 OK, how about other methods of noise suppression in the SM version? I was puzzled in that video by the fault you had with 65 volts shorted to the case without damage which implies that the metal outer case was not grounded, and also why you removed the metal lid from the SM module which should have provided some internal screening. Ferrites on the power wires between the SM and Riden would also be worth experimenting with. For the linear version you discussed using the capacitor bank as a screen between the two units. Might be worth trying this on the SM version with a sheet of grounded aluminium or a piece of unetched PCB material. Finally a filter on the mains inlet is always worth having!

I have a transformer that puts out 55VAC. What is the best way to drop it to 50VAC for a 70VDC RMS? I do have a handful of W26NM60 Mosfets handy. [26A, 600V NPN] The DC voltage drop only needs to be 7V @12A max for 84W dissipation [Waste] when done linearly, The RMS should be 77V. I have the RD6012 and it does have 80V input caps. The long story part is I have a transformer based 3000W power conditioner [30Lbs] that regulates the voltage by an extra shunt winding on the primary side that connects to a regulator board. It has both 110V and 220V outputs, but if you switch a mechanical switch on the back to 220V but still only feed it with 117V. The 110V outlet now puts out 55V and the 220V outlet puts out 110V. This would give me isolated from the mains 55V to use for the Riden and a 110V outlet to plugin what ever I happen to be working on, again all isolated from the mains. I still have to try adjusting potentiometers on the regulator board to see how low it will go. I was hoping that if I can get it to the low 70's the Riden wouldn't care while I don't like running Caps higher than 10% under their rated capacity.

Hi Jerry. Great series so thanks for that. I'm waiting for my Riden to arrive on the slow boat and this series has encouraged me to look at building a linear version. Are you able to link to the capacitor kit you found? I've searched many ways to find something similar but came up with nothing close. If not the same kit, then would you be able to outline what would be required to replicate that kit if I were to buy components separately. I see the 68 caps and PCB but is there anything else much? Thanks.

@JerryWalker001

4 жыл бұрын

I cannot remember where I purchased it from but something like this should work www.ebay.co.uk/itm/68PCS-75V-220UF-Power-Supply-Board-PSU-Module-DIY-Kit-for-HiFi-Power-Amplifier-/251531020520?hash=item3a906ac8e8Note that I did not assemble it as intended (see video) as I wanted a single capacitor bank but the board was designed for a +/- supply.

@andydix6243

4 жыл бұрын

@@JerryWalker001 many thanks. I've just gone back and watched that section of the previous part and you linked to it in those comments so got it now. Thanks again.

Good video, thank you. What is your gut feel for noise if we powered the Riden with four or five 12V lead-acid batteries in series?

@JerryWalker001

3 жыл бұрын

Should be similar to the linear version although I would advise adding some current limiting. If you try it then please let me know what you find.

Tx for yet another video! I would like to know where the noise from the smps is coming from and if there is anything one can do to mitigate it. Adding a ferrite core to one of the leads? Installing the smps with the leads close to the front in stead of to the back end? You’ve already mentioned that adding capacitors wouldn’t help. Would a bimodal inductor do any good? Please like if you’re interested too so it’s clear if there are more people interested in this subject. Tx.

@JerryWalker001

4 жыл бұрын

The noise is not coming from a single cause and so would be very difficult to eliminate. It may be possible to mitigate it to a certain point but as it will vary for different SMPS and at different loads then there is no single solution. The noise is also not all comming 'out' of the supply terminals and some is also coming via mains loops and as can be seen in the PF issue there will be mains noise that would also need to be addressed. You could try things such as LC networks but these may only work for certain conditions and may actually make things worse. I also suspect that there is interaction betweent the Riden and the SMPS which will also vary under different loads and for different SMPS. All this is why linear supplies are the way to go if you are looking for low noise.

@Conservator.

4 жыл бұрын

Jerry Walker Thank you! I thought I was complex but now I know it’s even worse than that. 😢😉

@Conservator.

4 жыл бұрын

Jerry Walker I know the basics of inductance in the sense of how inductors and transformers work. I can identify the components of an SMPS and could explain there function in the circuit. I understand that when the raising current in the primary winding is interrupted and the magnetic field collapses, that a reversed current in the secondary winding is induced. Snubber networks, optocouplers, (zener, Schottky) diodes, mosfets, etc have little mysteries for me anymore. But I wouldn’t even have thought of at least half of the things you mentioned above. I’ve searched for video’s on inductance but they all relate to regular use of it inductors and transformers. Maybe these unwanted phenomena you described are trivial to you but I suspect that they are a complete mystery to many. I don’t know if you would want to make a video on this subject but if you would you’d have at least one very interest viewer;) I am aware that even a 15 minute video will take many hours to produce so this is not a request, just me saying that now that I’m aware of these things I’d like to learn more about it.

Wouldn't a switching power supply with PFC improve things like the apparent power and thus the total efficiency?

@JerryWalker001

4 жыл бұрын

Yes it should do. As I said you can get more expensive supplies which may be better although I very much doubt that the final result would approach the linear version. A comment on one of my videos asked about the use of inductors to smoothe supplies and if you think about it my supply has two huge inductors which are very effective in controlling the PF and reducing noise. This is why just about every top end supply is linear. There are many ways to approach it of course and an interesting project would be to see how low you can get the noise. A major difficulty is in actually measuring the noise so that you can see how well you are doing.

Where did you get the linear powersupply?

I wonder what would happen if you added the capacitor bank to the switch mode supply, how much would that help?

@JerryWalker001

4 жыл бұрын

It would not make much difference and can even make it worse under certain conditions depending on the supply used. The noise is not coming through the conductors to the RD6006. The testing I carried out actually went way beyond what I showed in the video, I only showed the relevant bits. I tried capacitors and inductors between the SMPS and the RD6006. An LC network certainly reduced conducted noise into the RD6006 but as this was mostly not getting to the output then it did not make much difference. You may notice in the video that the PF dropped significantly for the SMPS version after the initial PF test and this was due to trying an LC network for PF correction on the mains input. I did not show this in the video although I did test wuite a few configurarions. This did make a difference although it was still not even close to the Linear version. One advantage of transformers in linear supplies is that they effectively put a very large inductor in the 'current path' and this really helps to reduce noise.

What is the ripple under load? I am building something similar for my RD6012 and getting about 3V pk-pk at 10A. I used the same capacitor bank, what can I expect if I connect a second one. Is there any way to calculate this?

@JerryWalker001

2 жыл бұрын

Many factors affect ripple such as capacitor value and ESR, Bridge rectifier drop, Transformer secondary resistance and transformer core losses so you will need to calculate the required capacitance to achieve your target ripple. My design target was 200mV pk/pk and I ended up with 180mV but that was using a 6006 so maximum was 6A. You also need to consider that the switching frequency of the 6012 is very high compared to the 50/60Hz (100/120Hz) ripple so it is not critical except for preventing the 6012 going into shutdown and providing acceptable regulation.

Hi, nice series about this excelent PSU. I have two 850 and 1000Va toroidal transformers with 55v and 60v. Do you know if the Riden supports voltages between 76v and 83v. I have in my hands the new version RD6018W.

@JerryWalker001

3 жыл бұрын

The Riden controllers will shut down if the supply voltage exceeds approx 70V.

@fmlopes

3 жыл бұрын

@@JerryWalker001 Many thanks Jerry.

could I use a faraday cage, inside the main case but outside the switcher case, "around the switcher" and ferrite beads on the power leads into the switcher and out of the switcher to reduce the electromagnetic noise substantially (say by half or 2/3 ??)

@JerryWalker001

4 жыл бұрын

It would not make much difference but you could try. The EMC is referenced to the 'ground plane' so it would need to be addressed by reducing the impulse noise relative to the plane. You would need to do what you are suggesting but for the entire supply.

@alex34alex34

3 жыл бұрын

@@JerryWalker001 Seems, common mode choke could help?

Soo, what is the price difference, if We buy a good switching power supply price would be at least $32. What would be a 2x toroid transformer with some caps and diodes?

@JerryWalker001

4 жыл бұрын

I have no idea as I rewound my own transformers and cost would depend on where you purchased them from. I think I paid a total of around £28.00 for the parts but it is hard to say as I only used part of wire reels. If you were to purchase two similar transformers then as an estimate it would cost around £100.00. However as I say in the video this is not the only way or even the best way. The video is intended to give ideas that there are alternative methods. Also the two resulting power supplies are very different in terms of performance and the linear version is (in my opinion) far more useful in a lab environment so direct price comparisons are not really relevant. It depends on what youa re looking for and what you have to hand.

Great series of videos! I have a question. Could you instead make 2 transformers „in series” but in the way that secondary of the first becomes primary of the second? Will that have any advantages? Cheers

@JerryWalker001

4 жыл бұрын

Connecting them the way I show connects them effectively in parallel as far as the power handling is concerned. COnnecting the output of the first into the input of the second would put the power handling in series so would halve the power handling capability.

@pfabiszewski

4 жыл бұрын

Jerry Walker great, thanks. Never thought of this way of connecting transformers. Very interesting. Dave said in his video that capacitance of the output is too big. Is it worthy to change those caps for smaller?

@JerryWalker001

4 жыл бұрын

Yes the output capacitance is way too big and it causes the output to change too slowly. I would not recommend changing them as most likely this would negatively impact on the supply performance. I do however agree with a comment made on one of these videos where fitting a relay between the RD6006 and the output terminals would be a very good option. This could be driven by the 'ON' LED ourput from the controller so that it disconnected the terminals immediately the supply output is turned off. Unfortunately this would require quite some work because of the way the supply is constructed. The high capacitance is rarely going to cause any problems as long as you are aware of it.

@pfabiszewski

4 жыл бұрын

Jerry Walker by performance you mean increased noise?

@JerryWalker001

4 жыл бұрын

The linear version has much lower 'noise' but also better step response. The RD6006 is of course still switching so there is still switching noise. I tested 5 SMPS including the recommended one and they were all worse than the linear version in terms of noise but that is not really a surprise.

Hi. As i noticed, I'm french. I have two identical torroidal transformer. it's strange. It's written on them (300VA, one and really only one secondary 22v at 6,8A) It must be an error I presume. (Indications are "IDDM-SEM T300/1-1307) The two are similars. Imagine they are combined in series. 44v vith diodes = 62.04 (without 0.7v per diode). Do you agree it's insuffisant to obtain the output max ?. Is there a way for me to send these strange indications about these infos to you ? It seems it's divided by 2. What do you think about that and what would be the best advise for a french beggine Ike me? best regards (and sorry for my engligh and.... using a smartphone...). Laurent

@JerryWalker001

4 жыл бұрын

The rating and voltage will depend on many things. The core rating does not always match the windings. I wound my transformers to get maximum use of the core sizes but this is not always the case. Two 22v RMS windings in series will provide an unloaded DC output of around 60V but this will drop under load. If they are rated as you say then they are likely to give around 55V when supplying 6A

@dlaurent67

4 жыл бұрын

@@JerryWalker001 Thanks a lot for your useful answer.

@allahasan6631

4 жыл бұрын

@@JerryWalker001 witch VA rating should use in that sit-up i saw in a store its starts from 50va up to 3000va for one trasformer

@JerryWalker001

4 жыл бұрын

You need a total power handling capacity of around 450VA depending on the power factor that you acheive.

@allahasan6631

4 жыл бұрын

@@JerryWalker001 i have only one transformer at these moments that used for led strip's light i can match up another one to it or must buy new exact pair

A hybrid solution could be interesting - adding the same capacitor between the switcher and the control head. Wonder if it would get a lot better?

@JerryWalker001

2 жыл бұрын

It is worth a try although most of the 'noise' is not conducted through the switching front end. It is loop noise but it would be interesting to try it. I suspect it would make little difference to the HF noise.

@SixWildKids

2 жыл бұрын

@@JerryWalker001 Are there any ceramic caps on the cap card? Would some ceramic caps help with the loop noise?

@JerryWalker001

2 жыл бұрын

@@SixWildKids The loop noise does not pass through the board so nothing you do to it would make much difference. Most of the noise present in the video is actually coming out of the mains socket rather than the DC power connection. The entire system including scope would need to be put into a proper test setup to get a clear picture what is really going on but I suspect that a significant amount of work would be needed to make much of an impact. That is really why I built the linear version. The front end is still switching of course but it is more of a pwm controller than a SMPS so it has lower impulse noise. It will also vary a lot depending on the type of switching supply, loading etc. Having said all that some ceramic caps on the smoothing board may help to reduce the front end switching noise but as that is only around 5% of the total noise then the return would be small.

@JerryWalker001

2 жыл бұрын

@@SixWildKids I forgot to say that I will be posting a video soon showing Power factor etc for the different supplies I have including the Riden units.

Thanks for this video series. I am also building a similar power supply(buck converter output) on my channel and it helped me in the way that you proved my decision to be right making the back end linear will save some noise on the output later :) Makes it heavier but oh well you can´t have everything right ? ;)

@JerryWalker001

3 жыл бұрын

I agree, Linear supplies may be heavy but they do have a lot of advantages. The Riden is of course a switching unit but the vast majority of switching noise when using a switching back end was coming from the power supply. The linear back end also prevents lots of noise going back into the mains and making its way around the lab. This could be minimised by filtering but there is no need when using a linear back end. I don't intend to do much hiking with the supplies so the weight should not matter. In fact a small benefit which is probably underestimated is that the linear supply does not slide around when I am trying to use it like the switching versions do.

@Telectronics

3 жыл бұрын

You are absolutely right in every point ! Maybe you can give me your oppinion for my buck power supply design what do you think ? I wanted to design it for 5V and 20A but I have problems to find a single diode rated for 20A. I found a double diode in my parts bin that is rated for 2X16A so what I thought is making two buck coils that are switched interleaved with 180° out of phase so that way I should be getting away with 20A every half cycle and can use both diodes in the package. I have often read that it´s not a good idea to use two diodes in parallel for higher current so that is my next best solution for it. It also should reduce the ripple interleaving two coils as I did read about it.

@JerryWalker001

3 жыл бұрын

@@Telectronics You are aiming for an 'average' DC current output so using multiple 'inputs' will work well. You have several options for this such as parallel diodes but this is not a good idea as they will not share the loads equally due to differences in forward voltage drop, switching characteristics etc although there are methods to minimise the problem. A better option is to either use multiple windings on a single coil and feed it from multiple drivers or use multiple phased stages (as you suggest) or combine the outputs from multiple stages after the DC has been produced. Each has pros and cons. It also depends on your switching method as many power diodes will tolerate switching currents many times the continuous limit.

@Telectronics

3 жыл бұрын

Thank you for your fast reply. My switching method I aim for continuous current mode and current mode control because I think it should be the best for a stable short circuit protection or constant current usage. My input is from a 12V 150VA toroidal transformer and I estimated 30000µF filtering should be enough for a 5V stable output.

@JerryWalker001

3 жыл бұрын

@@Telectronics Yes 30000uF will easily be enough as long as you have a reasonable switching speed. It is also better to use multiple capacitors rather than one or 2 very large ones as you will get a lower ESR. (I am sure you already know all this but I thought I would just mention it so you knew I was paying attention :) ).

Hello Jarry. I also converted the RD6006 into a complete linear power supply. Rippel and Noise is very small at 29mVpp at maximum load. Link: www.eevblog.com/forum/testgear/ruideng-riden-rd6006-dc-power-supply/new/?topicseen#new Greetings from germany. Rolf

@xXTehPacoXx

2 жыл бұрын

was about to share this with him , cool method!

Jerry, can a person also build a Linear for the Riden RD6012W?

@JerryWalker001

3 жыл бұрын

There is no reason why not although it would need a big transformer and so be very heavy.

@bernardmartin7709

3 жыл бұрын

@@JerryWalker001 I'm thinking of finding a way to DIN mount the transformers inside a cabinet and hanging it on the wall, weight should not be an issue. any idea how big of a transformer i would need to look for to do the 12 amp linear?

well VA for switcher was 430VA before next test...

@JerryWalker001

4 жыл бұрын

The video was taken over approx 7 hours and originally I showed how to correct the PF but I edited that part out as it was not really relivant to the video as it was not something that could be included in the supply itself. The same applied to the linear version gave 390VA.

Hi Jerry, That concludes in a great manner your very interesting series about the Riden PSU. As I already told you, I've been looking for a good cheap lab supply for a while now, and thanks to you and to your work, it seems like I found it! I'm about to order the RD6006 and its case now, and of course, to give the whole thing a linear flavour. About the transformer, TME sells (and has in stock) a product, the Talema 58-0500-048-S , which seems to meet the specs we need for our unit: 230V in, 500VA, 48V out, 140mm diameter and 64mm height. Here is the link : www.tme.eu/fr/details/58-0500-048-s/transformateurs-toroidaux/talema/ Would you mind giving me your opinion about this model? I intend to use a Schottky rectifier to minimise the voltage drop and the heat. Then, for smoothing, I am note sure about the capacitors. I'd like to use a few number of capacitors for repairability reasons: 2 or 4 like in many audio amplifiers seems adequate to me.What would you suggest as a good capacitance value? Thank you sooooo much for your help, and for having shared with us all this great work! Sam

@JerryWalker001

4 жыл бұрын

I am already aware of the TME units and they should work OK but I have not tried one (you could always rewind it if you needed to :) ) be sure to note that the VA is not the same for 50 and 60Hz. Around 20,000uF @ 80V minimum should be OK but you need a very low ESR as you are feeding a switching convertor. By using 68 capacitors each with 0.2R I end up with a combined ESR of about 0.003R (in theory). As I say in the video the approach I took is not the only approach so you can experiment with whatever you can find.

@daLittleBossSam

4 жыл бұрын

@@JerryWalker001 Wow I'm starting to understand why you used the board of capacitors... I'm trying to find capacitors to make a 20.000F network at 80v, and it is actually very hard to find or very expensive, when you want to use only 2 or 4 of them: 5.000F capacitors rated at 80V or above seems to only exist using snap-in connectors, and cost tens of Euros each! This is even worse with 10.000F So I might stick to what you used: a large array of smaller capacitors, easily rated at 80V and above, and with a low total ESR (low esr seems not to be that hard to find though: low impedance big capacitors with about 0.02R are common, thus 4 of them would make a descent 0.005 theoretical esr)

@JerryWalker001

4 жыл бұрын

Correct. I am trying to show different ways to do things so that alternative ideas can be tried. I only paid £16.00 for the board, delivered. I think I mentioned in one of the videos that I was surprised that the kit had 68 genuine Rubycon caps. These are normally in excess of £1.00 each so getting 68 of them plus a board, plus connectors plus a rectifier for £16.00 is a good alternative to cheap large value caps. If you shop around you may be able to find some larger caps at a reasonable price but as I say you have alternatives.

@Giovanni2862

4 жыл бұрын

Sorry for my interference. Could the following transformer also be sufficient? TALEMA 58-0400-048-S 400VA; 230VAC; 48V; 8,333A; 3,2kg; H: 54mm www.tme.eu/it/details/58-0400-048-s/trasformatori-toroidali/talema/

Great work. I have a suggestion, you should use a NTC thermistor in series to the primary coils. Without this the full bridge rectifier recive a very big current at the start up.

@JerryWalker001

4 жыл бұрын

Actually is doesn't because the transformer is a highly inductive load and so it limits the initial current. If you measure the inrush current in a supply like this then you would see a relatively low initial current. Also the transformer limits the peak current that can be transferred without core saturation so no additional limiting is required.

@RickB3n

4 жыл бұрын

@@JerryWalker001 You are right. I wasn't thinking from that point of view. Can you tell me how many VA a single transformer should be. And how much should the filtering capacity be?

@JerryWalker001

4 жыл бұрын

@@RickB3n For a single transformer then at least 450VA should be used and 15000-20000uF

@RickB3n

4 жыл бұрын

@@JerryWalker001 Thanks, i subscript to the channel.

Personally, I would not put all blame on switching power supply in general. I would say, this specific power supply is generating this amount of noise. I am writing this because this power supply which you used is not approved by the manufacturer (RD). And people are now thinking all switching supplies are horrible. I am not implying the recommended power supply would be better, I am just thinking this is not fair. Another thing is, I was thinking, I would do the same as you. Buy another one and use a toroid transformer. But then I realized I would be overpaying this supply for what it is. It would be a better solution just buy a linear power supply and not worry about noise at all.

@JerryWalker001

4 жыл бұрын

Please watch the video. I specifically say that different SMPS will vary. However ALL SMPS will not be a good as a linear one. I also specifically say that not all the noise is due to the SMPS and I specifically show the noise created by the RD6006. I also specifically say that everyone should experiment and that I used these transformers because I had them to hand so the cost was low. This is about experimenting. So I do Not think it is unfair in any way. I made all points you raise very clear and you may have missed the point of the video which is to try different things. Finally I specifically stated that this is Not neccesesarily the best and certainly not the only way to go about this. I also tried a number of SMPS and they all gave similar results. Perhaps you could try building one of your own and posting some videos on the results?

@JerryWalker001

4 жыл бұрын

I forgot to say that I did test the recommended S-400W supply and it was about the same in terms of noise as the one I showed but got a lot hotter at full load as it is only 400W compared to the 600W of the supply I used. Remember that there are losses and the peak output needs to be a continous 396W minimum (65V @ 6.1A). If you check the specs for these supplies then you should normally not use them over around 70% max power continously so I would certainly Not use a 400W supply. However this is a matter of personal choice and it is up to the individual if they want to use this supply. Out of interest which linear supply would you buy to save money over building the linear version? I am not aware of any linear supply of this power for under £150.00 which is what the version I built would cost if I had purchased all the parts.

Thanks for sharing, this is how the capacitor bank would look and connect after the modification? Here you can see the image imagizer.imageshack.com/img922/7015/HJzKnQ.jpg A greeting.

Dave Jones from eevblog did the same noise measurement .. kzread.info/dash/bejne/maSrzcuDc5jOlrg.html I do not understand what you tring to achive .. the Ryden ontroller as you call it is a smps

@JetGyrotech

4 жыл бұрын

obviously you did not watch the video or maybe you had the volume down

I can't believe it took an HOUR of my day and for that it desrves a review. it's a good topic, verbose, detailed, repetitive points... bordering on excessive emphasis, possibly due to the consideration that the viewers are stupid or has a lesser mental faculty, quite interesting while perplexing to the senses some times. Clearly, a superiority complex to deal with, a textbook typical narcissist personality type or otherwise, the speaker simply loves to hear himself talk. There, a taste of repetition and wordiness, redundancy, and overbearing circuitous points so you have an idea in case you have not realized. But I did watch the whole shebang because of the methodical experiment. Which cannot be achieved without the narrator who apparently owns the channel and without wich the video that contains the experiments cannot be accomplished. So it's a given on this situation and I have no choice, to begin with. Needless to say, despite the adversity of it all... it is informative. And for that I say... Good Job and Thank You for your selfless contribution and impressively modulated voice.

@JerryWalker001

4 жыл бұрын

No one forced you to watch this video and it is intended for those who are interested so obviously not you. Your comments are rude and pointless and any explanation I give is intended to be informative so I word it specifically to try to help others. If you do not like the style of presentation then you can simply stop watching instead of 'wasting' an hour of your day just so that you can complain.