DUSKWORK VCO V2 Manuale di costruzione - Pagina 6

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| DUSKWORK.NET | Self-Tuning VCO V2 Build Guide

Step 9b: Connect the 6 pin ISP programmer as shown below. Red stripe should be toward

the top!

Note: -12v is at the bottom of the socket

Step 10: Time to plug in the VCO, but don't worry about a CV input or output just yet! We

need to calibrate the 1v rail by using the top right-hand trim pot. Grab a multimeter and use

the "volts" setting to measure across the

GND

which are located just beneath the 10 pin

power header. Adjust the trim pot until you measure exactly 1v. This is regulated by a

precision voltage regulator and this is what feeds the Self-Tuning circuit.

Step 11: Now time to run up the VCO on your system so we can calibrate the 1v/oct setting.

You'll need to use an external tuner for this part – I just use the built in one on Ableton, but a

phone app, or hardware tuner should work just the same.

This step is the same on any 3340 VCO build – you need to make sure each 'C' note is exactly

one octave apart. Adjust VR5 (top left trim pot) until these are exactly in tune.