INSTRUCTIONS \ TTSH \ Trimming instructions

Ring modulator
Positive Null
01) Put switch in DC position
02) Raise VCO 1 slider only
03) Monitor output with oscilloscope and adjust POS NULL for minimum output

Negative Null
01) Put switch in AC position
02) Raise VCO 1 slider only
03) Monitor output with oscilloscope and adjust NEG NULL for minimum output

Gain
01) Raise both sliders into Ring Modulator and set switch to DC
02) Adjust GAIN trimmer for 20Vpp maximum


VCO 1 to 3
V/oct adjustments
01) Monitor output with frequency counter or tuning standard
02) Depress low C and adjust frequency for 100Hz using coarse or fine tune slider
03) Depress high C and adjust 1V/OCT trimmer for 1600Hz
04) repeat 2 and 3 until C are correct

Frequency calibrate
01) Monitor output with oscilloscope or frequency counter
02) All FM sliders down
03) Remove keyboard CV from selected VCO
04) Put frequency slider far right (maximum)
05) Put fine tune slider – mid range
06) Adjust FREQ CAL for 8.33kHz


VCO-1
Pulse width
01) Monitor square wave output with oscilloscope and adjust SYMMETRY trimmer for 50% duty cycle.


VCO-2 Wave shape adjustments
Symmetry
01) Monitor triangle output with oscilloscope
02) Adjust TRI trimmer for best triangle waveform

DC offset adjust
01) Adjust OFFSET trimmer so the peaks of the triangle waveform is not flat or either end

Gain adjust
01) Monitor sine wave output with oscilloscope
02) Adjust GAIN for 10Vpp output

Purity adjust
01) Adjust PURITY for best sine waveform
It might b e necessary to readjust calibrations after performed in the order listed.


VCF
Frequency calibrate
01) Monitor VCF output with an oscilloscope or frequency couter
02) Initial frequency slider – left
03) Fine tune slider – mid range
04) Resonance slider – right
05) All VCF inputs sliders – down
06) Disconnect or use dummy plug for KYBD CV in
07) Adjust FREQ CALIBRATE for 10Hz output

V/oct adjust
01) Repeat steps for frequcny calibrate but reconect keyboard
02) Depress low C (0 volts)
03) Adjust initial frequency slider and fine tune slider for 200Hz
04) Depress C three octaves higher and adjust 1V OCT trimmer for 1600Hz
05) Repeat step 2-4 until low C remains at 200Hz and C3 remains at 1600Hz

Output offset
01) Monitor VCF output with oscilloscope
02) Initial frequency, fine tune, and resonance slider – left
03) All input sliders down
04) Adjust OUTPUT OFFSET for minimum DC output. Movement of the initial frequency slider should not cause more than 1V deflection

Gain adjust
01) Open VCF initial frequency slider – right
02) Resonance slider – left
03) Raise VCO1 input slider and adjust GAIN for same amplitude as measure at VCO1 output


VCA
Linear gain
01) Monitor VCA output with oscilloscope
02) Patch VCO3 saw to VCA ‘VCF Input’ jack and raise audio slider fully
03) Put initial gain slider – left (minimum)
04) Raise VCA AR control slider all way
05) Depress and hold the manual start button and adjust LINEAR GAIN for 10Vpp maximum signal output

Control rejection
01) Repeat steps 1-3 for linear gain adjustment
02) Patch VCO2 LF sine wave (2Hz) into VCA AR control input
03) Close VCA VCF input slider
04) Adjust CONTROL REJ for minimum output

High frequency reject
01) No adjustment necessary

Exponential gain
01) Set EXP’L GAIN trimmer fully clockwise
Experiment with exponential setting…


Internal Clock
Init frequency
01) Monitor Internal clock output with an oscilloscope
02) Put rate slider at max
03) Adjust INIT trimmer so the square wave doesn’t disappear at max rate setting

Pulse width
01) Monitor Internal clock output with an oscilloscope
02) Put RATE slider at max
03) Adjust WIDTH trimmer for 50% duty cycle


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