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Old 17th May 2007, 02:38 AM   #1
diyAudio Member
Join Date: Mar 2006
Location: Vancouver BC
Default multiple components with one psu?

I am building my first preamp after successfully building Peter's LM3875 Chip amp. I have bought circuit boards from Elliot Sound Productions in Australia. My preamp will consist of:

- Signal selection
- phono stage (separate pcb)
- preamp pcb
- volume potentiometer
- 3 band eq (with adjustable mid q and bypass-able, this will be p2p wiring)

My question is thus:

Can I use my ESP +- 15V power supply to power the preamp, phono stage, and eq stage? I suspect I can ... but I'd like more info.

here's a link to info on the psu board I'm building.


... and the preamp ...


... and the phono stage ...


Thanks everybody!
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Old 17th May 2007, 08:02 AM   #2
diyAudio Member
Join Date: Apr 2004
Yes you can do this. Return all power connections directly to the PSU board, don't daisy-chain boards together.

You might want to add some small heatsinks to the regulators on the PSU, if the regulators get too hot. Try it without first and touch them. If they are getting too warm (you can't hold onto them for a few seconds without it hurting) then add heatsinks.
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Old 17th May 2007, 08:56 AM   #3
peufeu is offline peufeu  France
diyAudio Member
Join Date: Mar 2001
Location: Lyon, France
When regulators are in the middle of a circuit board, applying heat sink is tricky...

In this case I solder the regs on the underside of the board (the copper side), fold the legs, and screw them on the chassis metal plate on which the PCB is mounted. Works well on aluminum plates, but not on steel.

(watch the pinout though, don't solder them with reversed pinout...)
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Old 17th May 2007, 09:19 AM   #4
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Join Date: Apr 2004
True, however it looks like Rod has allowed space for some small heatsinks to be fitted. It's not ideal as the regulator pins would be supporting the heatsinks, but it would be OK.
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Old 19th May 2007, 12:14 AM   #5
diyAudio Member
Join Date: Mar 2006
Location: Vancouver BC
thanks guys, that's exactly what I wanted to know
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