| waltona |
Hi,
I've knocked up a regulated power supply for a preamp and as this is my first go at a board design I'd be grateful if somebody could give it a quick once over to check for any mistakes.
I based the design on one I found on the internet but I can't remember where I saw it. If it is your design that I have 'borrowed' then I'm sorry not to give you the due recognition. From what I can remember the original design had a star ground arrangement while mine uses a groundplane.
A couple of questions.
1. Will the design work?
2. Is groundplane or star ground better? Or should i not ask a question like this?
3. I'm going to be using a transformer with dual secondaries. Do I just put the 2 appropriate wires together to creat the 0V input? (similar to Nuuks power supply here http://myweb.tiscali.co.uk/nuukspot...inclonepre.html )
4. Any improvements?
Thanks for any comments
Al |
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| peranders |
1. It's very likely but I'll recommend that you take a look in the datasheets for the regulator. There you will have correct information.
2. Personally I would choose groundplane. Sometimes star ground is better but not in this case.
3. Yes, so add one more 0V connection
4. Not much if you want to do a basic LM317/337 PS.
For inspiration you can check my power supplies, both stand-alone and integrated in my amps. |
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| richie00boy |
It looks like my design you borrowed. A mention would be nice :)
It looks OK. Yes you just connect the two wires together at the PCB for your centre tap. I chose star ground but the circuit is quite small so a groundplane will be fine and I don't think you'll see any real difference.
C12 and C13 are optional really, in my own builds I just leave them out and employ local bypassing. Same goes for C6 and C7.
I assume you're getting the boards made which is why you didn't just use my files. DIY of double-sided boards is harder than single, but as your design is simple it should be not too bad. |
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| waltona |
Thanks for the comments Peranders. I'll have a look at your work.
@Richie00boy
I knew I'd copied it from somewhere, I just couldn't remember from where! Anyway, thanks very much for design, much appreciated. I hope it is ok to use it. I've got the opportunity to have a double-sided pcb milled for free so I thought I'd try to create my own in Eagle with some major copying from somebody who knows what they are doing!
Al |
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| waltona |
Having looked at Richie's website I now see that C9 is not in the correct position. It should be connected to the LM337T adj pin and not V-. Schoolboy error.
Al |
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