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picture from http://yusynth.net/Modular/EN/MOOGVCF/index.html
Trimming
copy from yusynth
V/Octave tracking :
- Apply 0.000V to the V/Oct input
- Turn the frequency knob fully counter-clockwise in order to measure 0mV at the base of Q1 (node between R9 to R11)
- Apply 1.000V to the V/Oct input
- Adjust T1 in order to measure 18.2mV at the base of Q1
- Apply 5.000V to the V/Oct input
- Check that you have 91.0mVat the base of Q1, if not adjust T1
- Apply 0.000V to the V/Oct input
- Set the filter to auto-oscillation (EMPHASIS turned fully clockwise)
- Connect a keyboard (CV/GATE) to the V/Oct input
- Play a tune and check the goodness of the tracking
- Slightly adjust T1 to achieve a good chromatic tracking.
Frequency range :
- Apply a sinewave with frequency 32Hz to the audio input
- Emphasis potentiometer to minimum resonance (fully counter-clockwise)
- Turn the frequency knob fully counter-clockwise
- Adjust T2, in order to mute the 32Hz signal.
Emphasis :
Adjust T3 in order to reach auto-oscillation near 95% of the full range of the EMPHASIS pot.