[sdiy] power supply

[TIm Daugard]

>a question and topic change, how do all you synth diyers power your trial circuits? is it >best to try out on breadboard with a battery power supply? 

I use an old variable supply that I salvaged from a breadboard that I bought at a flea market. It provides + 3 to 15 volts, -3 to 15 volts, and a +5 volt supply. The three terminal regulators are pretty indestructable. I have shorted lines many a time with out damaging the supply. I've only replaced the negative regulator and that was due to corrosion and not due to failure. I have built these simple supplies many times, Though the variable is relatively new to my bench (years instead of decades).

After saying all that. I only use +12 volts for my modules. I make small modules. The only transformer I can get easily that fits in my standard box doesn't have the headroom to power a +15 volt supply. The +12 volt supply means no problems with CMOS.  (Except when I have to use 74HC chips. Then I put a small (100 mA) 5 volt regulator in each  module that needs it.

Tim Daugard
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