Electronics > Beginners
Op amp based preamp supply. Charge pump, single vs symmetrical & ripple
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dazz:
I've been trying the MC34063 today to build a negative rail. It works great... except for the current draw. I know you guys said it's an old chip and very inefficient, but come on... the thing is drawing almost 300mA to convert 9V to -9V! I must be missing something  :palm:
dazz:
Success! I eventually managed to pull this off with an MC34063 based boost converter and some LC filters. Works a treat!

Attached pics of the schematic and the pcb. Thanks everyone for your help
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