Build a +/- 15V Power Supply
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- Опубліковано 6 вер 2024
- I build a dual-rail 15V power supply to power the RIAA pre-amp I need to build for the jukebox. This is a handy project build anyone can tackle that is really useful when playing with audio circuits.
I've left all my screwups in, so you can see what not to do! 😂
Also, I mention a datasheet-recommended decoupling cap. I had a read of the datasheets and can't find any reference whatsoever to that cap - so it might just be popular myth... but I'm leaving it in.
Nice Vid, I have the same, knowing how my mind works, all inversions and swaps are to be expected. :)
Hi Steve,
I have ( and still do lol ) made all those same mistakes. But it's a convenient way to put together a quick board. Love your work mate. All the best for 2023.
Cheers Chris, same to you 🙂
Things may happen when you make stuff yourself. I don´t know how I do it myself sometimes either and you should see the circuits I design and draw myself in my projects, it is insanely many things they do with tons of components and with the schematic aside I just take a perf-board and wing it, I don´t even make a basic layout on a paper, usually I don´t use Perf-board with lines like yours but just solder islands so I also have to connect every component in every aspect and make my own tracks for it as I go. I imagine a little bit how I want it and build with improvising and surprisingly never really failed either and got really nice final results with it. But in all honesty, making the schematic is usually easier than soldering it all together when you do it like this. But you also get a very personal result from it. I try to make my fails when I am at the prototype stage and build on the Breadboard and be somewhat serious when I build the final thing on Perf-board and I have many devices serving me nicely in my life from doing this. you should see the capacitor I use in my Perfect-DC variable stabilized Tube Amp Power supply, it is a a supply going up to 500volts and half an amp and it uses a final output stage capacitor of 13000uf 500Volt low ESR cap and it is almost as big as a half gallon water bottle, Imagine what would happen with that if I would flip the polarity, gosh
Yep, not everything runs smoothly... it's about catching the errors BEFORE the smoke comes out 😂 And I like the 'dot' board you mention too - you can do more compact builds with it since you're effectively making your own circuit board. Using veroboard here was a bit of a nostalgia trip for me, as I haven't used it for many years.
@@VintageRadioSteve Indeed :) I pretty much only used dot board as we can call it, I try to make my design in a way that don’t need jumpers to connect different tracks or at least as few as possible. It is actually pretty easy to make tracks on these either using the component legs or a pre tinned wire across the track you wanna do.
I had one time there was a mysterious issue with one of my boards and it was very intermittent too. The fault was the voltage regulation was not completely stable. I turned the board inside out and looked with microscope and measured it everywhere and the board was immaculate and still it would not always work properly. If I poke with a plastic stick on anywhere on the board it might show symptoms but where they came from was a mystery. Regardless how good everything looked I took the board and re-flow every single track from side to side and tried again. It been working for years now. I never gonna know what caused the issue which is a bit annoying but there must have been a tiny fracture somewhere just big enough to disturb the sensitive voltage feedback. Who knows. But as long as it works I am happy anyway.
Can u upload the citcuit diagram for this somweher properly arranged it would be really helpful, thankss
Hi, thanks for watching - the circuit diagram is shown in the video, and that was the best copy I had of it, since I drew it at the time I made the video... I don't have that paperwork any more, but you should be able to copy it from the video. Cheers, Steve
Hi! could you add the BOM list on description, it would be very helpful! :) thanks
Edit: i guess im looking for safe power transformers, i dont really need the whole bom but anyway, it might help someone
FULLBRIDGE RECRITIFIER!!!
Hi, I drew the schematic in the video around 3 minutes in - so everything is there. I don't have the paperwork any more, but it's a pretty standard circuit. The power transformer is from Jaycar, so probably only any good if you are in New Zealand or Australia, but I think it's a Soanar type 2855 (15-0-15V at 150mA). The Jaycar cat number is MM2007. Cheers, Steve
@@VintageRadioSteve Yeah my bad, im a bit impatient... thanks for the info and time to respond my questions :)
what is a pi filter pls?
My best understanding is that it's a filter made from three components that look like the symbol for pi when drawn in a schematic. First component across the oncoming signal, next in series, then across it again... I'm pretty sure that's where the term pi filter comes from, but an actual electronics engineer can probably explain it better. Cheers, Steve
@@VintageRadioSteve cheers. I looked it up and I think it helps suppress ripple.
@@deanedgx Hi, my apologies I completely misunderstood your question... I thought you were asking why it's called a PI filter. Glad you figured it out despite my 'help', lol... Teachers used to tell me I needed to read the question properly... I guess I still haven't learned that one 🙂
@@VintageRadioSteve cheers matey. Yep, I have a similar habit. I watched za few videos on pi filter and they seem to work really well. As an audio person, I guess I see them as a 3rd order filter (CLC type) that does a great job of, at least, filtering the harmonics of ripple.