It finally dawned on me why i really like the aesthetic of this specific model of walkman: It looks like a PS1-Sega Genesis hybrid

Nice job Sj. Loving the content. cant wait for the next one! I'm really hoping your channel blows-up!

@sjm4306

5 жыл бұрын

Thanks!

HOLY COW!! That is an awesome idea!!

Once again, awesome work.

Very awesome job !!!

Came out really well indeed! Nice work!

@sjm4306

5 жыл бұрын

Thanks, happy with how quick and cheap they are too. I'll have to make a few more, as it seems these players are battery hogs and even with the extended capacity still only last around 3-4 hours.

@Zenodilodon

5 жыл бұрын

@@sjm4306 3-4 hours is still significantly longer than most of the things with batteries I make lol.

@sjm4306

5 жыл бұрын

I'm spoiled by modern devices that last 10+ hours of moderate to heavy use!

@Zenodilodon

5 жыл бұрын

Mental note to self. Never accept an endurance test against sjm4306.

AWESOME!

now i need the parts to make a battery for my ibook clamshell :)

Hello! Thank you for sharing all these online ! I appreciate all your hard work ! However I have a question, I tried to order the battery board on JLCPCB and they told me it's the board was not accepted. "Failure Reason: the clearance between slot to slot or outline require 4mm at least in case of break off + slot width need 1mm at least, kindly replace with new file." Could you help me with this ? Thank you!!

Hi Sir Awesome skills.

@Darwinknows

3 жыл бұрын

Do you plan on making another batch of these ? I could clearly use a couple for my discmen. I could provide you with the exact measurements of the original battery if you still need them. I have two dead ones. Let me know.

@sjm4306

3 жыл бұрын

Sorry, it'd probably take longer for me to order all the parts and in the end you'd still have to source and solder your own lipo since I cant safely/cheaply send that through the mail.

Love this ! Did you get around to posting the 3D print files yet ? I’d like to give this a try 👍🏻

@sjm4306

5 жыл бұрын

Oops, completely forgot to link the files to the hackaday.io project page. I'll upload them when I get home tonight.

@8-bitbitsa821

5 жыл бұрын

sjm4306 thanks... I’ll get right on it... bring on some stl files 👍🏻

@sjm4306

5 жыл бұрын

Added the 3d shell stl/solidworks as well as pcb contact board gerber/eagle files. Link in the description above. Feel free to tweak them to your heart's content, but most importantly have fun.

Really, really great work!!! -- Unfortunately the gerbers you included no longer pass the default audit for JLCPCB (9/2021), the slot with must be >= 1mm and the board/board edge are too small.

@sjm4306

2 жыл бұрын

That's a problem, I tried getting them vscored originally to increase the total board size and they couldn't do it. The whole board probably needs to be redesigned to integrate an outer pcb frame that's routed to the panelized boards with bigger clearances.

@sjm4306, I noticed that the Li-Po battery I am using at the moment (it's only 450mAh, I ordered a 1000mAh one) is (logically) dropping below 4V quite quickly, resulting in 2 bars battery life and a premature cutout as the player considers the battery empty while it is actually not. Since the Li-Po batteries are normally 3,7V I am considering to add a step-up to keep the voltage around 4 volts until the battery is empty and the step up switches off. Before experimenting with this, what is your experience with the larger capacity Li-Po's?

@sjm4306

3 жыл бұрын

A boost/step up converter will allow you to extract most of the energy in the lipo (at the cost of 10-20% being lost to inefficiencies in the converter). All good things have a downside though since the battery indicator will always show 100% right up until it cits out with no warning. As for a larger lipo, I was actually thinking of making a bottom mounting larger battery with at least 5000mAh with dedicated usb for charging while attached. It should only add a few mm in height to the player but run for substantially longer.

@LogicWheels

3 жыл бұрын

@@sjm4306 Found and ordered a 1000mAh cell and installed it together with a step up and a low-drop diode in the output to avoid charging from the adapter. I have around 2.5 hours of continuous play time. Not bad at all. Going to design 2 stackable PCB's with charger and step up and a connector for the battery so it will be an easy build for anyone who wants to do this. Once I have this ready I'll share the project here. Thanks for sharing this idea, great stuff! Link to photo of the project: imgur.com/wZHejsW

@sjm4306

3 жыл бұрын

Awesome, yeah link me when done and I can add it to the video description/pin it in the comments

Will this work on a d-25? Also the Ebay page just brings me to the home page are you not making these anymore? Depending on how much I'd love to buy one if I don't figure out how to make one myself!

@sjm4306

4 жыл бұрын

The d15 and d25 players are very similar so I'd expect it'd be compatible. I did a small kit run but it was a bit of a pain having customers sourcing the lipo batteries themselves as it would be prohibitively expensive/difficult for me to ship live batteries.

@gamerdave9286

4 жыл бұрын

@@sjm4306 I understand. Thank you for the fast reply! Really appreciated!

What’s the correct usb charging board for this project assuming I’m using a 3.9V battery? Thanks!

@sjm4306

2 жыл бұрын

This is the one I used and it'll work with pretty much any single cell lipo/li-ion battery: ebay.us/DFMvro

Great project ! Any plans to sell these battery on ebay ?

@sjm4306

4 жыл бұрын

I'm a little worried about what hoops I'd have to jump through to mail lipo batteries and I imagine it'd cost me more to make them by hand than I could reasonably charge.

The hackaday page with download links for the STL files doesn't seem to work anymore.

@sjm4306

10 ай бұрын

It might be your browser, the file page (hackaday.io/project/165088-sony-discman-diy-lipo-battery/files) works for me in firefox

Hello, I made one for my Sony Dz555 discman and its working. But how much playing time do you have? I have only 2 cd's and its empty.

@sjm4306

3 жыл бұрын

That's roughly what I get, 2-3 cds from a full charge. Keep in mind there's no boost regulator to extend runtime down to the last drop of available power and even with that you are mostly limited by the relatively inefficient circuitry of the discman.

@tomneijnens4048

3 жыл бұрын

@@sjm4306 I am very happy with this solution! I have supplies for making 2 of them so that would be 5 cd's. Good enough for me. Did you consider selling these on eBay?

@sjm4306

3 жыл бұрын

I initially did but quickly gave up when I thought about the logistics of sending lithium batteries through the mail. Then I thought about what if I just sell the rest of the kit and have users source and solder their own batteries but that seemed like a nightmare waiting to happen lol.

@tomneijnens4048

3 жыл бұрын

@@sjm4306 Yeah I would not make DIY kits indeed. I understand the shipping issue, its not that easy to ship lithium battery's indeed

What would happen if you plug the usb charging cable AND insert the battery into the player, then keep it that way (assuming it's physically possible)? Would it continuously discharge and charge while powering the player, or it wouldn't charge at all?

@sjm4306

2 жыл бұрын

If the usb current were higher than the discharge current drawn by the player then it'd charge but at a slower rate than if it were only charging. Otherwise it would drain but just slower than if it were just running on battery alone.

@janczajka6749

2 жыл бұрын

@@sjm4306 assuming the charging current is higher than the draw, what would happen once it's fully charged? Are there any downsides of keeping it constantly plugged in? Sorry for all those questions, but I'm not sure where to look for this kind of info.

@sjm4306

2 жыл бұрын

Once it's fully charged the lipo charger chip tries to trickle charge the battery with some hysteresis to keep it at the termination voltage. What would likely happen if the player were also drawing its normal operating current is the battery would cycle around the fully charged point. Short term nothing bad would happen as the charge controller would prevent overcharging, but long term this oscillation would eat into the total lifetime cycle count of the battery and reduce capacity. To prevent this you would need to add circuitry/complexity to detect charged status, cut off the battery and directly route power from usb to the player.

i think the diy battery is 3.7volt, while the original battery is rated 3volt? is that okay?

@sjm4306

3 жыл бұрын

I referenced the service manual to find the supply chips' part numbers so I could look up their datasheets to make sure it was fine. I've been using the battery for over a year without incident.

The battery is actually a 2-cell sealed lead-acid battery.

@sjm4306

5 жыл бұрын

Interesting, didn't know they ever made such small sla's

@douro20

5 жыл бұрын

@@sjm4306 There were even smaller ones made, for cordless phones.

Are these replacement for sale for my D-9 Sony? Mine is totally dead

@sjm4306

8 ай бұрын

Wish I could but sending lipos in the mail is difficult and expensive

Aye you cool bruh really like the knowledge videos that you bring out i wanna start doing the same. One question though my seagate 2 tb hard drive my ps4 doesn’t read it and i bought like over some months ago do you have any idea why it doesn’t read it and how do i fix it?

@sjm4306

5 жыл бұрын

Thanks, dude. Are you trying to use it as an internal or external hdd? Also have you formatted it?

@iRaven-_-

5 жыл бұрын

Im using it as a internal hard drive for the moment but when i plug it in with the usb cable it doesn’t read it why is that?

@iRaven-_-

5 жыл бұрын

Im using it as external hdd*

@iRaven-_-

5 жыл бұрын

And yes I already formatted but my ps4 stopped reading it, i checked if it’s my ps4 the problem but its the hard drive.

@sjm4306

5 жыл бұрын

Have you plugged it into a pc to see if it is recognized?

that ebay purchase link does not work anymore. I would like to order one.

@sjm4306

2 жыл бұрын

Sorry I've run out of boards and no longer sell complete batteries or kits for them. All the files are available on the project page linked in the description so if you are inclined you can build one yourself.

is possible to buy entire kit or component for my sony Discman D250? your link ebay no work and i need this battery DIY for my discman.

@sjm4306

Жыл бұрын

Sorry I've run out of parts for this mod ages ago so I no longer sell either completed or as a kit.

@gladiorosso9816

Жыл бұрын

@@sjm4306 I need only little piece contact plus and minus that you show from jlpcb

@sjm4306

Жыл бұрын

I'd need to reorder a min quantity of 20 or 30 at a time. If I had enough orders I'd consider it.

@gladiorosso9816

Жыл бұрын

@@sjm4306 TY but i think i'm the only one interested... :(

Hello can I buy 1 battery case for my d250

What is the nominal voltage of the original battery?

@sjm4306

2 жыл бұрын

IIRC 4V, it's two series lead acid 2v cells.

@Zebra_Paw

2 жыл бұрын

@@sjm4306 OK thank you so much. I will solder wires and give 4V to the device.

Very good idea, had the parts lying around so modified the design a bit with cooling vents as the charger can become quite hot. Printed the casing from PETG as it withstands the heat better. Only had a 400mAh battery lying around so need to order a 700 mAh lipo that fits the casing. Now for the challenging part, finding my D-15 on the attick! :-)) Link to modified casing: www.tinkercad.com/things/34NAIV3zJNu-sony-discman-d-15-battery-casing Link to picure of my project: imgur.com/WBWaBrx

@LogicWheels

3 жыл бұрын

Found it, actually it is a D-250. Battery holder is just a bit to short so modified it. But, player fired up and shut down. The laser gear was ceased. took it out, cleaned it, added some new grease and it plays smoothly again. Happy bunny!

@sjm4306

3 жыл бұрын

It makes me happy to see others improving on my projects and releasing the modifications for others to use!

Hello, I appreciate your hard work ! I was thinking if I could cut the traces of the 9v power socket and branch the socket to the battery and charge it(5v of course) Do you think it's feasible ? Thanks a million :)

@sjm4306

3 жыл бұрын

So long as you apply the required 5v to the usb input to the lipo charging board that I used in this mod then it'll work. Just whatever you do, don't directly attach 5v to the lipo battery itself, this could cause it to puff, vent and/or ignite!

@leana8959

3 жыл бұрын

​@@sjm4306 Yeah okay I'll be careful Thanks for the response !

Any chance I can commission you to make a battery for a Discman D-15?

@sjm4306

2 жыл бұрын

Shoot me an email at sjm4306@gmail.com

NES micro?

How do you power on the discman

@sjm4306

4 жыл бұрын

Not quite sure what you are asking (how it's turned on or how it's physically plugged in to receive power)?

@mr.whiskers6273

4 жыл бұрын

@@sjm4306 I mean it in a way that you put a CD in it and then what, what do you press to power on the machine. I got my Sony d-150 from my dad but he was not sure if it was broken or not and he says he's forgot how to turn it on

@sjm4306

4 жыл бұрын

Ah, ok I understand now. You press the play button to turn on the discman.

@mr.whiskers6273

4 жыл бұрын

@@sjm4306 on the front or on the top of the discman?

@sjm4306

4 жыл бұрын

This specific model has the play button on the top

Are you interested in selling these batteries at all?

@sjm4306

2 жыл бұрын

I don't mind selling the parts except the lipo. The reason is sending batteries through the mail is not cheap to do properly and if done improperly I can get in a lot of trouble. So in general I don't even want to mess with lipos in the mail.