Rick, I truly enjoy watching your videos; you explain things so clear and effective that the person without electronic background can understand and not get overwhelmed. Thank you so much for taking your valuable time and teaching us your techniques so we can build AM transmitter to enjoy lessening to these AM radios. Have a great day! Regards, Jay

@AllAmericanFiveRadio

Жыл бұрын

Thank you, Jay. I appreciate your comments very much. I have a Free eBook. You can download by clicking on the link. PASSWORD is allamericanfiveradio drive.google.com/file/d/1HHmaWYr7UMACfmS4W5uL6PADoem2KlRp/view?usp=sharing

Rick, another fine innovation you've shared with us. Thank you so much, really really appreciate it. Ron

@AllAmericanFiveRadio

4 жыл бұрын

Thanks

For those looking to build an AM transmitter, here's a beauty. Rick, I have to say that P-C70-OSC coil is a good one to start with. I had great results with that coil. And using your design I had it working in no time. I highly recommend this one.

@AllAmericanFiveRadio

4 жыл бұрын

Thanks Carl. The circuit should be about the easiest one for beginner to have success with. Plus it's something useful too.

Thank you very much for this video. I was looking for a good scheme and now i have it all.

@AllAmericanFiveRadio

4 жыл бұрын

Thanks

I'm from brazil and would like to thank you for sharing your knowledgment with the world. I'll try to make this AM transmiter, the coil will be de hardest point, but i'll not quit! sorry for my rusty english

@AllAmericanFiveRadio

4 жыл бұрын

Thanks and your welcome.You might try eBay for the coil.

Sounds great. I am going to have to give that one a try.

@AllAmericanFiveRadio

4 жыл бұрын

Good and thanks.

Awesome build Rick. Has with all you great Guys and Gals,I liked,Shared,Added to playlists. All my best.

@AllAmericanFiveRadio

4 жыл бұрын

Thanks

That is a very interesting circuit, especially when you made that with a MOSFET. Very good, also that you show the practical circuit. And the modulation is also very very pure, thanks for this upload.

@AllAmericanFiveRadio

4 жыл бұрын

Thanks radiofun232 it is a very simple circuit but I think it performs very well. I'm hoping that the circuit will be successful for the beginner. I'm sure you know it's a little trickier building a transmitter because of RF. It can be a challenge for the beginner to keep the RF out on the antenna. Rather than have it go into the power supply or it having find a path to ground.

@radiofun232

4 жыл бұрын

@@AllAmericanFiveRadio Thanks!

thank you for making this video tutorial I love the many lessons I took ....

@AllAmericanFiveRadio

3 жыл бұрын

Thanks and your welcome.

Thank you for your quick answer

@AllAmericanFiveRadio

4 жыл бұрын

Your welcome

I'll have to see if I can pick up the coil here in Scotland! It seems to have a decent range which can be a problem on some transmitters I've encountered which practically have to be touching the receiver to get a decent response!

@AllAmericanFiveRadio

4 жыл бұрын

Add a larger variable cap in the tank circuit for AM Transmitter Build FM One Transistor Transmitter Project Modification 3-3 kzread.info/dash/bejne/ZaiXlcl7dbifetY.html

thank you for the explanation, will try it

@AllAmericanFiveRadio

3 жыл бұрын

Thanks and your welcome. Good luck.

Nice Job Sir, Thank You !

@AllAmericanFiveRadio

4 ай бұрын

Thank you! The P-C70-OSC maybe difficult to find. I made another AM Transmitter with a Home Made Coil. Here is the link to that video. MOSFET AM Transmitter Home Made Oscillator Coil kzread.info/dash/bejne/ap6Kl9Sfk5C3mKQ.html MOSFET AM Transmitter Home Made Oscillator Coil PART II kzread.info/dash/bejne/hKGGutCinbHeZZs.html

I was looking for a AM TX schematic, and this is what I need. Thank you, Subscribed de KC1ATW

@AllAmericanFiveRadio

2 жыл бұрын

Thank you. I do have several other videos on transmitter's. Some are FM transmitters. The circuits are very similar, mostly the difference is in the tank circuit. Just do a channel search on transmitter's on my channel.

Thank you so much

@AllAmericanFiveRadio

4 ай бұрын

Thank you, and your welcome.

thanks so much , that helped a lot . thanks robin

@AllAmericanFiveRadio

4 жыл бұрын

THANKS

Rick, I’ve been following for a few years now and can’t tell you how many times I wanted to ask you for something like this. I bought the AM talking house and that thing is garbage. I tried to build a few but with no luck. This simple LC tank circuit looks to be something that will work. Parts are already in the mail. Thanks for sharing and teaching us.

@AllAmericanFiveRadio

4 жыл бұрын

Let me know what happens I'll be glad to help

@MrTysonjharris

4 жыл бұрын

@@AllAmericanFiveRadio I put the power supply together on a breadboard. Working perfectly. I can't get the transmitter to work. Pretty sure I have the coils correct, verified w/ ohms read. I have a frequency counter. I've connected it to the antenna and the ground and it just reads 50-60 hertz. I put the trimmer capacitor at 300 pF. Not sure what the issue could be. I'm using the SG9058-ND trimmer and the coil you suggested from the source recommended. Non of those capacitors have polarity so I'm not sure what I could be doing wrong.

@AllAmericanFiveRadio

4 жыл бұрын

@@MrTysonjharris Does it work without an antenna and ground?

@MrTysonjharris

4 жыл бұрын

@@AllAmericanFiveRadio I does not.When I connect it to the power supply and have it near my AM radio I get distortion on every frequency I tune to. I've ordered new parts except the trimmer and the coils and will lay it out again on the breadboard. Can you confirm for me the direction of the coil? www.amplifiedparts.com/sites/default/files/uc_products/p-c70-rf_nohat_1.png Using this orientation, to the right of the red dot is which 1 or 2? Note: I've recapped more than a dozen radios, pretty confident in my abilities. Sort of a head scratcher why this isn't working. If you were going to use a frequency counter to verify the coil was oscillating where would you tap into the circuit? - Thanks

@AllAmericanFiveRadio

4 жыл бұрын

@@MrTysonjharris Yes I was thinking about the coil. The information from Antique Electronic Supply is shown as a bottom view. I wish they would have labeled it as such but they didn't. I went to their website and they have more information than what comes in the box. Here's the link. www.tubesandmore.com/products/coil-miniature-adjustable-coil-70-oscillator

Sadly, we no longer have a Radio Shack, or any other electronics shops to get parts from in my town. Thank you for the tutorial.

@AllAmericanFiveRadio

4 жыл бұрын

Thanks.I now use eBay.

Nice circuit. For some reason I couldn't get it to oscillate with the IRLB3034PbF HEX FET (Ebay) but it worked with any other N-FET I tried (IRF520-630). It also works great with an 100uH to 150uH and a 10uH cheap ebay inductors in series. It's a realy beautiful design with only a few parts and it realy works good. Thanks for sharing!

@AllAmericanFiveRadio

4 жыл бұрын

Thanks. I would test the IRLB3034PbF HEX FET to make sure it's good. If it is good try running the transmitter on 24VDC. I wanted to design a circuit for the beginners so that they would make a successful build. My FM transmitters are of the same design and work very well.

@eivindamundsen7090

4 жыл бұрын

@@AllAmericanFiveRadio I checked the 3034 FET and it tested ok. I also tried 4 more FET's from the same batch without any luck. I only ran it on 12V-18,5V (the supply I used didn't go higher) but I will try again with 24V. Thanks again! Btw: If I wanna match/tune in my antenna can I just mirror the" LC tank circuit" from the oscillator and put in series with the antenna? 🤔

@AllAmericanFiveRadio

4 жыл бұрын

@@eivindamundsen7090 Here are other experiments, hope you try them. Build FM One Transistor Transmitter Project Modification 3-3 kzread.info/dash/bejne/ZaiXlcl7dbifetY.html FM Transmitter Varactor Diode Modulator kzread.info/dash/bejne/fIV7udRrlLPLZKg.html FM Transmitter, MOSFET Experiment kzread.info/dash/bejne/c5mm1JivZrndl84.html

@elshiftos

2 жыл бұрын

I tried this with a couple of scavenged 100uH and 10uH inductors but it didn't want to oscillate. Would you happen to have a link to the inductors you used as I can't find the OSC coil Rick used here in the UK? Thanks!

@abu-zaiter

Жыл бұрын

the distance between components and the ground size changes the frequency

well it sounds like a little Old time radio going on over there and I am a big fan of Johnny Dollar, and any of the old Lux radio theater programs...but the best part about this transmitter is the simplicity of it yet its quality and clarity are not sacrificed. I have been tinkering around the bench and considering building a transmitter but I am not sure yet if I want to build it Am or Fm .

@AllAmericanFiveRadio

Жыл бұрын

I enjoy Johnny Dollar (Bob Bailey) and have many on cassettes and CDs. I use both AM and FM transmitters and they both sound good. It depends on what radio I want to use. Both transmitters simple and almost the same circuit. Here is a FM transmitter. Build FM One Transistor Transmitter Project Modification 3-3 kzread.info/dash/bejne/ZaiXlcl7dbifetY.html FM Transmitter, MOSFET Experiment kzread.info/dash/bejne/c5mm1JivZrndl84.html

That audio sounds like the sound track from the movie "It Happens Every Spring", circa 1949. Did you get some wood repellent with the tape?

@AllAmericanFiveRadio

4 жыл бұрын

Yes it is, but no hair tonic came with it.

☺😊😀😁😂5 smile's learning AM and RF signal will definitely be testing this curcit for a education in AM.👍got one off the cheap 335hz on eday on 7v 15m with out amplifier may get 35m max at current and looking at a 2.5w booster for a bit better range and will need to upgrade for a 500m to 1km range for professional use on some stuff ive been working on.

@AllAmericanFiveRadio

4 жыл бұрын

Good Luck!

Wow, what a great AM transmitter! Where did you purchase your MOSFET? Also, I believe I have the exact Osc. Coil but if I remember right - the connections to it were a little confusing. I know there's a little red or black ink dot on it. I'll have to see if I still have the diagram to that coil. Great video, thank you!

@AllAmericanFiveRadio

4 жыл бұрын

You get the diagram of the coil with the coil. You can get the MOSFET from Mouser. Sometimes I use eBay.

hello, was wondering if you can use an am oscillator coil (like you know, the one with red head/adjuster) in place of your 70-osc coil? thanks in advance.

@AllAmericanFiveRadio

2 жыл бұрын

An AM oscillator coil should work. I do have videos where you make the coil for AM and FM transmitters. Here is one video. Build AM FM Transmitter One Transistor Project 1-3 kzread.info/dash/bejne/aI6ns7Ctir3Fhpc.html

nice work

@AllAmericanFiveRadio

4 жыл бұрын

Thanks

hi rick .can you tell me about the variable capacitor that you used. what are the pf values? cant seem to find any thing that will work. thanks so much robin

@AllAmericanFiveRadio

4 жыл бұрын

Hey Robin, I bought the variable capacitor from RF Parts www.rfparts.com , they may not have the exact one I used but I think you should be able to find a suitable substitute. 495-48pF Hope this helps. Rick

I have a talking house brand AM transmitter. I need to build or get an 18-volt power supply. The original supply has a ground prong at the wall. Too bad it wasn't at the thrift store with the transmitter. An 18-volt dill battery will power the unit fine for a few hours.

@AllAmericanFiveRadio

4 жыл бұрын

Yes, the power supply will save a lot of batteries, and money. Hopefully you'll be able find a power supply that will work. With batteries you might try running it on 12 V DC because a 12 V supply would be easier to find. Thanks.

@jefferyb304

4 жыл бұрын

@@AllAmericanFiveRadio I might be able to use 12 volts. But once the voltage goes down on the battery, the automatic adjustments go all over the place. This box can transmit on any frequency an AM radio can receive by using some sort of motorized tuner. That motor turns on when the power drops.

@andrewanderson319

3 жыл бұрын

A couple of options here... You can pick up another 18V battery charger and modify it to work at a constant 18V. You can also use an old laptop power supply. Most of those are at 19V. The one volt difference isn't going to harm the transmitter. You can also modify some of the older HP Printer power supplies. Most of those are at 32V. A voltage regulator and a few discreet parts and you can build it right into the Talking House.

Hi Rick! I want to try this circuit out. However I having a hard time finding the trimmer that you suggested? Is there an alternative value that you might suggest? Thank you for the great videos! Brendan

@AllAmericanFiveRadio

4 жыл бұрын

Hey Brendan, I bought the variable capacitor from RF Parts www.rfparts.com , they may not have the exact one I used but I think you should be able to find a suitable substitute. Hope this helps. Rick

@bdagle

4 жыл бұрын

@@AllAmericanFiveRadio Thank you for the come back and the help! I will check them out? Brendan

Very interesting design for the AM transmitter. I noticed however that the mosfet you used is rated at up to 343A of drain current. Would not mosfets with much lower drain current work?

@AllAmericanFiveRadio

4 жыл бұрын

I would think most any N channel MOSFET would work. I'm using this one because that's what I have on hand.

@enriquelaroche5370

3 жыл бұрын

@@AllAmericanFiveRadio I have piles of N channel Mos fets logic level .. I looked at your Circuit and wondered how critical the FET was.. Then I saw the 500 ohm in the source to ground path and realized the max current was very limited. Did I miss some other multi amp path? I have some 30N06L mos fets with Source Drain currents in excess of 30 amps. I'll try one

Great video

@AllAmericanFiveRadio

11 ай бұрын

Thank you.

thanks for the video! would you mind tell me the inductance of you coil or many turns?

@AllAmericanFiveRadio

3 жыл бұрын

I found a coil to measure and the results are between 1 and 3 R=6.0 Ohms L=0.10mH Can not tell you the number of turns. I would have to unwind it which would destroy the coil.

Hello again. I'm wondering, can a Bluetooth receiver be used in the audio input so as to stream music from a cellphone to the Bluetooth device and then through the am transmitter ?

@AllAmericanFiveRadio

4 жыл бұрын

That may work but all you need is an audio input

@AllAmericanFiveRadio I have built the transmitter from your video but am not able to tube in to the audio. I tried tuning the oscillator and variable capacitor to 455kHz but still no sound. Do you have any voltages I can check on the board?

@samuelberry1538

4 жыл бұрын

I also tuned it to 890 kHz and only hear a high pitched sound. Could it be the MOSFET?

@AllAmericanFiveRadio

4 жыл бұрын

I'll take some voltage readings you can contact me at allamericanfiveradio@yahoo.com

Could you use a variable capacitor and ferrite antenna from an old am radio?

@AllAmericanFiveRadio

3 жыл бұрын

Yes that may work

Could you please tell me where the negative from the power connects. May seem like a silly question, but I'm new to SCHEMATICS and no one ever seems to show that on the schematic. I'm assuming that connecting it to the grounds is correct ?

@jerrymercer7683

4 жыл бұрын

Also, how long of an antenna do you recommend ?

@AllAmericanFiveRadio

4 жыл бұрын

In this circuit the ground symbol is the negative side of the power supply.

Nice circuit. I will build one, but I would like to know more about how this circuit works. As I'm still learning radio theory please feel free to correct the following if I'm wrong. First, an audio signal enters from the right past a voltage divider and current limiter resistor to the gate of the MOSFET. While this is going on the coil and variable cap are oscillating at a frequency somewhere in the AM band. The oscillation is sustained by the voltage tap from the power supply. Pins 4 and 5 of the coil are not connected as the secondary side of the coil (normally an IF coil) is not needed. To get modulation, the MOSFET partially shunts the amplitude of the oscillator's signal to ground in response to the audio input. The modulated signal is then fed to the antenna through the 68pf capacitor. As for the parts, I'm finding that the coil is easily obtainable but the variable cap is larger than most available from the radio supply houses. Can I assume that a 15pf to 365pf capacitor will work as well, though maybe not for the full range of the AM band?

@AllAmericanFiveRadio

4 жыл бұрын

The two 10,000 ohm resistors that are connected at the positive and negative are the biasing bridge. The audio that passes through the 0.047uF capacitor adds and subtracts from this bias, producing Amplitude Modulation in the oscillator coil. Let me know if you have any other questions I will be glad to help.

@RestoreOldRadios

4 жыл бұрын

AllAmericanFiveRadio Rick - a simple and effective design. Regarding the AM modulation, does the modulation occur at the center frequency of the sine wave or does the modulated carrier(s) fall below and above the carrier frequency? Thanks for your time. Best, Don

Great video, but can we have more information about the coil? how we can get it or build it?

@AllAmericanFiveRadio

4 жыл бұрын

www.tubesandmore.com/products/coil-miniature-adjustable-coil-70-oscillator

Thanks for the video. I didn't understand a detail in the schematics, where the points 4 and 5 of the coil linked to ? are they coming from another oscillator providing the carrier frequency ? and is the carrier frequency limited by the transistor in the center ?

@AllAmericanFiveRadio

Жыл бұрын

They are open, not connected to anything.

@marouaniAymen

Жыл бұрын

@@AllAmericanFiveRadio Thanks for your response, but in this case, how do they contribute to the functioning of the circuit ?

@AllAmericanFiveRadio

Жыл бұрын

@@marouaniAymen 4&5 are not used they contribute noting to the circuit of the circuit.

@marouaniAymen

Жыл бұрын

@@AllAmericanFiveRadio Understood, thanks

No luck unfortunately. Can't get it to oscillate. Tried 12v and 24v. Anyone have any ideas? I even tried a 27-465pF air tuning capacitor. I bought all the correct stuff except for the variable capacitor. I couldn't get one with quite the range as the one in the video.

@AllAmericanFiveRadio

Жыл бұрын

Send me some pictures. allamericanfiveradio@yahoo.com

@Dave-he9uq

Жыл бұрын

Just wanted to report here that AllAmericanFiveRadio knew what the problem was right away. The oscillator tapped coil was labeled incorrectly. The red dot on the coil to signify Pin 1 was off by a pin. Everything works great now!

good work, nice and smple design, is that coil readilly available ?

@AllAmericanFiveRadio

11 ай бұрын

THANKS! I recently checked on the availability, it is available on eBay for $58. That is why I did these two videos. MOSFET AM Transmitter Home Made Oscillator Coil kzread.info/dash/bejne/ap6Kl9Sfk5C3mKQ.html MOSFET AM Transmitter Home Made Oscillator Coil PART II kzread.info/dash/bejne/hKGGutCinbHeZZs.html

Merci, very interesting! But impossible to find a P-C70-OSC for testing your schema.

@AllAmericanFiveRadio

4 ай бұрын

I did make two videos where you wind your coil. I also added this information in the SHOW MORE of this video. Thanks! The P-C70-OSC may be hard to find. In these video you make the oscillator coil. MOSFET AM Transmitter Home Made Oscillator Coil kzread.info/dash/bejne/ap6Kl9Sfk5C3mKQ.html MOSFET AM Transmitter Home Made Oscillator Coil PART II kzread.info/dash/bejne/hKGGutCinbHeZZs.html

Hi! It seems very impressive little transmitter. What is the output RF power at 24V? How can I connect the audio input (what is the input impedance and wattage)? Thanks and Regards

@AllAmericanFiveRadio

4 жыл бұрын

It covers the house nicely. The same circuit will also work with 12VDC.

@landsknecht92

4 жыл бұрын

@@AllAmericanFiveRadio Thanks a lot! I'm going to built this transmitter with a single mosfet power amplifier.

Would a 142UHY www.tubesandmore.com/products/coil-3-lug-oscillator-142uhy substitute for the P-C70? Your circuit doesn't need an audio pre-amp?

@AllAmericanFiveRadio

3 жыл бұрын

The coil looks good.

Hello Rick, I hope this finds you healthy and sane. A little unrelated but hopefully you can help. I built the McWhorter AM Tube TX recently and I’m having issues getting audio into it. The input transformer was not specified and I’ve tried some stuff I had laying about but still no luck. Any chance you could steer me in the right direction?

@AllAmericanFiveRadio

3 жыл бұрын

The audio transformer is one that you could use as the output for a 50C5 or a 50L6. For the transmitter I'm using the transformer backwards. Using the transformer as a step-up transformer.

@knifeswitch5973

3 жыл бұрын

On the right track now. Thankyou sir! Modulating now with a temporary while waiting for the right one.

Hi, Can an audio transformer works instead the coil? thxs

@AllAmericanFiveRadio

4 жыл бұрын

No it must be an RF coil. I did some videos where you can make your own coil, three parts. Build AM FM Transmitter One Transistor Project 1-3 kzread.info/dash/bejne/aI6ns7Ctir3Fhpc.html Build FM One Transistor Transmitter Project 2-3 kzread.info/dash/bejne/ZJ2cuNlsYNnQaNI.html Build FM One Transistor Transmitter Project Modification 3-3 kzread.info/dash/bejne/ZaiXlcl7dbifetY.html

hi nice vid thanks could you tell me how many turns on coil, size of form and wire diameter or gauge please

@AllAmericanFiveRadio

4 жыл бұрын

www.tubesandmore.com/products/coil-miniature-adjustable-coil-70-oscillator

@T2D.SteveArcs

4 жыл бұрын

@@AllAmericanFiveRadio Thanks Rick

How would i use this with a crystal oscillator? Just replace the coil and variable cap?

@AllAmericanFiveRadio

Жыл бұрын

Yes. You can use a crystal oscillator. This will limit your frequency to one choice. Here is a video on crystal oscillator. Crystal Oscillators for the Beginner kzread.info/dash/bejne/qpmu3NmDcb2rgbw.html

@howforless

Жыл бұрын

Thanks, I actually want to limit the frequency by design. i have recently built a transmitter using an XTAL Crystal and LM386 that works quite well but the distance is limited. I have a few n-channel mosfets sitting around and figured i could use them to increase the range, just wasn’t sure how to wire them up, seems that every other tutorial is using BGT transistors.

Sir thank you . What's the maximum range of this mideum wave transmitter ?

@AllAmericanFiveRadio

3 жыл бұрын

With an antenna it will cover about 100 feet. Thanks for your comment.

Thanks

@AllAmericanFiveRadio

4 жыл бұрын

Thanks

Rick, thank you so much for your previous reply. Just one more question. On the schematic, you have 495-48. I don't think that it's a 495pf, that would be much bigger than the one you showed. I'm guessing that 47pf is the high end, and the low end wasn't stated. Anyways, I found a 4 to 50pf. Will that suffice ?

@AllAmericanFiveRadio

4 жыл бұрын

With 50pF you might get into the AM band, but for-sure you’ll be in the shortwave band.

@jerrymercer7683

4 жыл бұрын

@@AllAmericanFiveRadio so, 50pf should be the low end ? I have one that goes to 365pf ?

@jerrymercer7683

4 жыл бұрын

@@AllAmericanFiveRadio So your saying that the one you used is 48pf to 495pf ?

@AllAmericanFiveRadio

4 жыл бұрын

@@jerrymercer7683 I think I'll do a video on this. I'll start on it today. Stay tuned.

@jerrymercer7683

4 жыл бұрын

@@AllAmericanFiveRadio awesome, I thank you so much for your help and your patience.

What about its range when 12v ?

@AllAmericanFiveRadio

4 жыл бұрын

Covers the house

Which transistor you've used?

@AllAmericanFiveRadio

3 жыл бұрын

195A MOSFET

Hey AA5Radio! I'm trying to make this circuit, as I find it VERY unique, but for the life of me, I cannot get it to oscillate. I've got the exact P-c70-OSC coil from antiqueradioparts, and the 3034 mosfet. I'm using a 365 pF variable cap (old one out of a radio). All parts are checking out good, but I simply CANNOT get the thing to oscillate as shown. the FUNNY thing is, if I substitute the .001uF cap for a .033uF, then it oscillates around 1MHZ, but CANNOT be tuned, AND, I can actually REMOVE the variable cap, and it still oscillates. What the heck am I doing wrong?! I've built it on a breadboard, and I'm pretty sure I've got it wired correctly. Thanks for all your videos.

@AllAmericanFiveRadio

Жыл бұрын

Ohm out your oscillator coil. The red dot maybe in the wrong place.

I can't seem to locate that coil. Could someone tell me where to buy it please?

@AllAmericanFiveRadio

4 жыл бұрын

www.tubesandmore.com/

@AllAmericanFiveRadio

4 жыл бұрын

www.tubesandmore.com/products/coil-miniature-adjustable-coil-70-oscillator

@ianbutler1983

4 жыл бұрын

@@AllAmericanFiveRadio Thanks guys, I appreciate it.

Any idea what output power, and what degree of modulation?

@AllAmericanFiveRadio

10 ай бұрын

The power out is enough to cover two or three rooms. The modulation depends on the audio input.

@SergiuCosminViorel

10 ай бұрын

@@AllAmericanFiveRadio so you do not know with what power and modulation you were working with. My question is serious, because not all transmitters can have high modulation, and the output power may be tiny

very nice! only that coil cannot be reached just like that you can't just buy that coil just like that so unfortunately we cannot imitate it 1 2 3. friendly greetings from The Netherlands! Rob.

@radiofun232

4 жыл бұрын

Hoi Rob, dat moet je wel aanspreken! De modulatie is ook heel zuiver, echt een super schema!

@hobbyrob313

4 жыл бұрын

@@radiofun232 Hallo Ko, Ja dat viel mij inderdaad ook op, je hebt helemaal gelijk! alleen die spoel? Das wel een beetje jammer, het zou nu mooi zijn als je de spoel gegevens ook zou hebben! Zat ook te denken ik heb hier ook de IRF510 liggen, misschien kan het daar ook mee. (het schema lijkt trouwens ook veel op de JostyKit-HF65 het FM zendertje maar dan met de 2N2219A natuurlijk!) sorry for writing dutch, back to english again now! VrGr Rob.

@radiofun232

4 жыл бұрын

@@hobbyrob313 Bedankt Rob.

@xXTheoLinuxXx

4 жыл бұрын

Volgens de comment van Elvind Amundsen zouden spoeltjes van 100µh tot 150µh en een van 10µh ook moeten werken (in serie). Deze zijn wel weer een stuk makkelijker te krijgen. En als ik naar het schemaatje kijk van hoe de spoel is opgebouwd dan zou je als je de 100µh met de punt die niet aangesloten zit aan 10µh dan dienen als punt 1, het punt waar beide spoelen aan elkaar verbonden zijn punt 2 en de uiteinde van de 10µh logischerwijze punt 3.

@AllAmericanFiveRadio

2 жыл бұрын

Thanks

How much it's range? Did you test the range?

@AllAmericanFiveRadio

2 жыл бұрын

It will cover the house and some out side.

Isn't the "Wall Wart" power supply already regulated?

@AllAmericanFiveRadio

4 жыл бұрын

No

@andrewanderson319

3 жыл бұрын

Most Wall Warts have poor voltage regulation (if any) and even worse filtering. It's not uncommon to see 12V wall wrts putting out up to 15V. If you want clean audio from your transmitter, build the regulator circuit shown in this video.

@ohger1

2 жыл бұрын

A basic wall wart is usually an 60hz (U.S.) AC transformer, a bridge rectifier, and a filter capacitor. These aren't regulated and the voltage drifts with load changes. But, there are plenty of "brick" supplies which are indeed tightly regulated. Still, in this circuit, you don't need a regulator with an unregulated 12V wall wart. Just add another filter capacitor on the board (like 2200uf/25V) and bypass that with a 0.1pf.

What's the range?

@AllAmericanFiveRadio

4 жыл бұрын

It covers the house nicely

I want to buy

@AllAmericanFiveRadio

3 жыл бұрын

Antique Electronic Supply for parts.

Hi im Jerry please I have question about if Transforme how many time have turn and uH many thank please text me

@AllAmericanFiveRadio

4 жыл бұрын

Do you want to know how many turns per uH?

@jarien2

4 жыл бұрын

I mean turns uH I’ll measure by tester

@jarien2

4 жыл бұрын

Yes

@AllAmericanFiveRadio

4 жыл бұрын

@@jarien2 There’s lost of variable. Size of wire, size of coil, number of turns, air core, ferric core, and iron core. Here's some calculators. www.allaboutcircuits.com/tools/coil-inductance-calculator/ www.66pacific.com/calculators/coil-inductance-calculator.aspx

AM more complicated than FM transmeter

@AllAmericanFiveRadio

Жыл бұрын

Build FM One Transistor Transmitter Project 2-3 kzread.info/dash/bejne/ZJ2cuNlsYNnQaNI.html