yano signal processing
plug-ins:psYchobass | multiband panner | a+/-b analysis tool
pedals:phase 100 | bazz fuss
papers:compressor effect study
projects:mixer | reference | opamp calculator

yMixer - schematics - power supply
main | schematics | build | pictures
power supply | input | mixing | output | voltage indicator

schematic of +/-9V supply charge pump with MAX1044
This mixer is designed around the use of a bipolar power supply, and so here's the one I'm using. It makes use of a MAX1044 which acts as a charge pump (using C1) to supply negative voltage. Notice that pin 1 is connected to +9V. Because the MAX1044 (and similar devices) operate in cycles, they produce a hum at whatever frequency they cycle. The MAX1044 supplies the option to move the frequency of the cycles up out of audio range. With pin 1 not connected, there is something of a whine in the upper frequency spectrum. Ensure that whatever method you use for supplying negative power does not operate in audio frequencies.

back | next