Symmetrical power supply

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Symmetrical power supply

Postby snk » 07 Apr 2018, 11:12

Hello
I have built a pedal expecting a +/- 12-15V symmetrical power supply.
I am torn between two solutions : either use a 15V Meanwell PD2515PSU i have on a shelf, or modify a Tube Driver daughter board to feed my stompbox symmetrical 12V from a "normal" 12V adapter.


1 - I have no experience from wiring Meanwell PSU, so could anyone help me and tell how to wire it properly to the pedal ? On the CN2, where is the +15, the -15 and the ground ?
Image


2 - If i go the "12V daughter board" route, what should i change on the Tube Driver daughter board to make it work fine with my FX (the Tube Driver daughter board has no ground input, and one wire at the end of the circuit is supposed to go the the tube socket : should i just ignore it ?)
Image

Thank you !
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Re: Symmetrical power supply

Postby snk » 07 Apr 2018, 23:44

I have read that in such circuit (i'm referring to the 12V daughter board on vero), the ground is "shared by the input and the output" : does this mean that i should wire both the DC ground and the circuit ground to the single hole at the bottom right of the veroboard ?
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Re: Symmetrical power supply

Postby mirosol » 08 Apr 2018, 08:26

snk wrote:I have read that in such circuit (i'm referring to the 12V daughter board on vero), the ground is "shared by the input and the output" : does this mean that i should wire both the DC ground and the circuit ground to the single hole at the bottom right of the veroboard ?


Yes. All grounds are connected together.
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Re: Symmetrical power supply

Postby snk » 08 Apr 2018, 09:42

Hi, Mirosol
Thank you for your answer (and thank you as well for your website http://mirosol.kapsi.fi/ and your many contributions on tagboardeffects) !
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Re: Symmetrical power supply

Postby aionios » 13 Apr 2018, 12:30

Depending on the amperage you need and the sensitivity of the parts, you may also want to check out the power supply section of the L5 Preamp:
https://aionelectronics.com/project/l5-preamp/

It uses 9VAC (not DC) and converts it to +/-15VDC with a whole lot fewer parts than that Meanwell supply. Plus, it's not switch-mode, so no risk of heterodyning or anything if there are clocks in the circuit.
Aion Electronics - DIY PCB projects for classic and obscure circuits
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Re: Symmetrical power supply

Postby snk » 14 Apr 2018, 21:52

Thank you for the tip !
So far, i am using my Meanwell, as it is already available, on my desk :)
But i will take your suggestion into consideration, as i have some other projects for the Meanwell...
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