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previous: R.G. Yeah, I actually have a "dying batt... -- 5/18/2000 10:02 PM View Thread

Re: Spyder with dying battery mod

5/18/2000 11:30 PM
Re: Spyder with dying battery mod
Sounds like a good idea, however there might be a simpler way of achieving the same results with only one standard 240/9V transformer.  
What if you add a switch to isolate the earth to the power leads except one of the power leads? So in effect "no pun intended":  
___________ _____+9V  
AC~ ---|Rectifier| +___________ |  
| |--|Regulator|-+----+9V  
AC~ ---| | |____+9V  
This should at least get rid of the ground loops from the effects themselves when using AC power. If you want to use batteries, no problem as you haven't changed any of the chords.  
This diagram is providing that you already have a normal style power supply or power pack with multiple outputs.  
I made up a power supply for my effects probably near on 10 years ago when I didn't know anything about ground loops. The power supply is just a single transformer, with seperate regulators (one for 9V, one for 12V), and I used speaker clips terminals for connecting power wires to 2.5mm dc line plugs (you know the ones where you insert a bare wire and click the terminal down). Having the wires free is so you can switch polarity depending on the effect. If I'm getting ground loops, I just detach a couple of the negative leads and most hum disappears.