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spider power supply question

8/20/2000 3:43 PM
peter	spider power supply question Ok, I just decided I desperatly need to build some kind of decent power supply to power my pedals. I just ran out of batteries (a box of 20 duracells I bought about a month ago) because of continously failing LED experiments...I like my LED's to be blindingly bright So here's the question, I've looked at RG's wonderfull articles about power supplies and the spider and I understand the concept of the ground loop causing hum. It's the seperation of the different circuits that's a little blurry to me. I have a transformer (220V to 12V I'm in europe so it's 220V here) but RG's transformer looks to be some kind of 1 x 220V in / 8 x 12V out...If I'm not mistaken. I really don't think I can build a transformer like this and was thinking, can't I use my current transformer but instead of seperating all the ground connections to prevent hum, connect all the grounds to the power supply with diodes ? Aren't diodes supposed to be some kind of one way streets, and wouldn't this prevent ground loops ? Maybe I'm just oversimplyfieng things...I'm sure there's more to it than that. Peter.

8/20/2000 3:43 PM

peter

spider power supply question

Ok, I just decided I desperatly need to build some kind of decent power supply to power my pedals.
I just ran out of batteries (a box of 20 duracells I bought about a month ago) because of continously failing LED experiments...I like my LED's to be blindingly bright ;-)

So here's the question, I've looked at RG's wonderfull articles about power supplies and the spider and I understand the concept of the ground loop causing hum.
It's the seperation of the different circuits that's a little blurry to me.
I have a transformer (220V to 12V I'm in europe so it's 220V here) but RG's transformer looks to be some kind of 1 x 220V in / 8 x 12V out...If I'm not mistaken.
I really don't think I can build a transformer like this and was thinking, can't I use my current transformer but instead of seperating all the ground connections to prevent hum, connect all the grounds to the power supply with diodes ?
Aren't diodes supposed to be some kind of one way streets, and wouldn't this prevent ground loops ?

Maybe I'm just oversimplyfieng things...I'm sure there's more to it than that.

Peter.

Replies:

R.G. q{I have a transformer (220V to 12V... -- 8/21/2000 3:18 AM