Frequency counter
The filter calibrator can be used to measure the frequency of the filter during self-oscillation. This requires the input of the sound card. The filter calibrator also outputs a MIDI signal for 3 octaves. Thus the filter tracking can be measured very accurately over the octaves.
Phoenix DIY manuals, Filter / Motherboard / software manuals
on this page you find all Phoenix/Shruthi User and DIY manuals. Most of the manuals are in PDF format , the schematics and firmware files are in a zipped file . You must extract this files.
build the PHOENIX motherboard
