Noob Transformer PSU question

[swilliman]

Hi all,

Apologies in advance for the very basic nature of this Q.

I’m looking to power a stereo Weak Joe compressor, with each channel needing +/- 15V AC and 1A. I’ve got a ready made Cebek power supply module and transformer handy already, which gives out the +/-15V.

Am I right in thinking this isn’t enough to power both? Or could I get a second PSU module and pull lines off one transformer to both.

I’m slightly confused. I haven’t found a PSU option that provides TWO sets of +/-15V.

Thanks!

 

[scott2000]

Depends on the current draw of the channels...... which I don't know......

Post number 9 here says he did a 4channel..... I'm guessing he means in one enclosure with one power supply....

https://www.diystompboxes.com/smfforum/index.php?topic=54794.0


he used this transformer which is rated one amp for your +& -15.

https://www.parts-express.com/avel-lindberg-y236103-30va-15v-15v-toroidal-transformer--122-605

...so maybe you're good  .....

Hopefully someone with experience with these can clarify more....I think there are some threads on these here too if you search.....Maybe there are some more clues for you.....

Good Luck!!

 

[JohnRoberts]

Power supplies deliver current at specified voltage. You say the weak compressor requires 1A at +/-15V so logically two would require 2A at +/- 15V.

1A sounds like a bit much for a basic 2 ch compressor so you may not need 2A (but I don't know that for a fact).

Another issue with running two units from a common PS is ground corruption. ASSuming the audio circuitry I/O treats the audio differentially and ignores ground potential differences they can be run from a single supply.

Maybe try it and see what happens. At least fire up one and measure actual current draw of +/- 15V rails to see how much current you need.

JR 

 

[swilliman]

Thanks for taking the time to reply guys. That’s starting to make sense.

As you say John, best thing is to just try it! I’ll start with one channel and measure it’s current draw. Hopefully the 1A will cover both boards

 

[Whoops]

Hopefully the 1A will cover both boards

Quite positive it will!