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DIY Stompboxes => Building your own stompbox => Topic started by: bioroids on March 22, 2004, 11:29:07 PM

Title: Diode bridge question & photograph & I'm graduated n
Post by: bioroids on March 22, 2004, 11:29:07 PM
Hi there

It's been a while since I last posted here, I was locked in my room studying, but now I find myself a profesional on Computer Science!

Now is time to build pedals!

I was wanting to build a little transformer box for powering a few (six) pedals. I was gonna use 6 little transformers to avoid the ground loop and stuff, but now I wonder

If I just use one big transformer and connect 6 diode brigdes in parallel, wouldn't that be enough to break the ground loop and avoid noises? I'm gonna try it anyway but I'm not sure how to test if the ground loop is effectively suppressed.

Any comments on this are welcome.

Thanks ahead

Miguel

PS: I posted a pic of myself (from last year) on my site, I was gonna do it a while back on another thread but didnt have the time till now.

http://ar.geocities.com/bioroids
Title: Diode bridge question & photograph & I'm graduated n
Post by: toneman on March 22, 2004, 11:34:52 PM
Hey Bio,

congradulations!!!!
ComoEsta??

Just use a 3-terminal regulator with 1 xfmr.
You'll B able 2 pwr 10 2 20 pedals.
that enough??
Look a the GEO site for the LM317 article.
it's an adjustable linear regulator.
The GEO site has a cute calculator 4 figuring the
res values 2 get the 9VDC U need...
staytuned
tone
Title: Diode bridge question & photograph & I'm graduated n
Post by: Gringo on March 23, 2004, 06:46:55 AM
Grande Miguel!! Felicitaciones!!!

No pude encontrar tu foto, lo unico... :?

Quien quiere programar/diseñar soft cuando hay pedales para armar? :P
Title: Diode bridge question & photograph & I'm graduated n
Post by: bioroids on March 23, 2004, 07:29:58 AM
Thanks guys, that's true, why build software when you can build pedals?
Maybe programming DSP effects, a plugin version of different pedals. Has that been done?

I posted the wrong link for the pic, check at:

http://ar.geocities.com/bioroids/foto.htm

Luck

Miguel
Title: Computer Science? Lo siento!
Post by: David on March 23, 2004, 08:59:57 AM
Computer Science??  Por que?!?!?

Ay caramba!  En los EEUU, Computer Science es muy fea!

In the States, information technology sucks! I hope things are better there.
Title: Diode bridge question & photograph & I'm graduated n
Post by: R.G. on March 23, 2004, 09:46:41 AM
QuoteIf I just use one big transformer and connect 6 diode brigdes in parallel, wouldn't that be enough to break the ground loop and avoid noises?
It's better than nothing, but if you think about it, all of the diodes conduct in synchronism at the peak of the AC wave. For a few milliseconds every AC half-cycle, all of the outputs are connected together through a few ohms of diode forward resistance. You're still open to hum, depending on the environment.
Title: Diode bridge question & photograph & I'm graduated n
Post by: bioroids on March 23, 2004, 11:12:46 AM
That's the answer I was looking for, RG.
Thanks a lot

So I'll have to get the multiple output tranformer or use the old ground lift trick. :(

Computer science is not so bad, and I'm not too much into theory, I'm more like an Analyst

Luck

Miguel
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