Hi all.
I need to build a power supply for my upcoming preamp - looks like it is much harder than putting together the op-amp based amplifier itself.
I used the schematic from http://audio.gotroot.ca/minipow/ - just changed the rectifier circuit from discrete diodes to the IC, fixed resistors for potentiometers, and then added the voltage doubler and LM317 for the phantom power (gospel says it's all about the input-output voltage differential, and "true" voltage ceiling does not exist in this regulator).
So here is my circuit. Could someone take a look on it and tell me if there are any obvious errors made? I'm pretty sure the symmetrical supply will work as it should, but i'm not sure about the +48V circuit - especially the GND bus. The schematic is right from the LM317 datasheet.
Thank you in advance,
Krzysztof
I need to build a power supply for my upcoming preamp - looks like it is much harder than putting together the op-amp based amplifier itself.
I used the schematic from http://audio.gotroot.ca/minipow/ - just changed the rectifier circuit from discrete diodes to the IC, fixed resistors for potentiometers, and then added the voltage doubler and LM317 for the phantom power (gospel says it's all about the input-output voltage differential, and "true" voltage ceiling does not exist in this regulator).
So here is my circuit. Could someone take a look on it and tell me if there are any obvious errors made? I'm pretty sure the symmetrical supply will work as it should, but i'm not sure about the +48V circuit - especially the GND bus. The schematic is right from the LM317 datasheet.
Thank you in advance,
Krzysztof