Square wave output. It has a level of +/-5 volts centred around 0v. The duty cycle
(amount of time the waveform is “high” against “low”) can be varied with the Manual
PWM control (15) or under voltage control (16). The output impedance is 1Kohm.
A control voltage can be applied to the PWM CV Input to vary the PWM duty cycle. The
control voltage range should be b/- 5volts and the intensity can be controlled
between 0% to 100% with the PWM CV rotary control knob. A low frequency triangle
wave to the PWM CV Input will give the classic sweeping PWM effect. The PWM Shape
Control is still effective when using PWM CV and it changes the offset level.
Power Cable
Copyright © AJHSynth 2014
A Tune Adjust :
Sets the default frequency for the VCO. This is a multi-turn trimmer that should be
adjusted with a fine jeweller’s screwdriver. Turn counter clockwise to increase VCO pitch
and clockwise to reduce the pitch. Adjusting this trimmer will not affect the scaling.
B Scale Adjust :
C Octave Adjust :
D HFT Adjust :
FOR MANUFACTURER ADJUSTMENT ONLY
. Specialist test equipment is needed to
calibrate this trimmer correctly.
E Shape Adjust :
FOR MANUFACTURER ADJUSTMENT ONLY.
This sets the current level through the
P-FET transistor buffer and incorrect adjustment can halt the Oscillator completely, so
NO ATTEMPT
should be made to adjust this trimmer.
Note:
This information is given for completeness, the MiniMod VCO is calibrated after manufacture
and under normal circumstances should not require any user adjustment.
Adjustment and Calibration
C Octave Adjust
HFT Adjust D
Shape Adjust E
Red Stripe aligns with -12V as shown
Scale Adjust B
A Tune Adjust
If you need any help using this module or have any technical questions please feel free to
contact us at [email protected]
FOR MANUFACTURER ADJUSTMENT ONLY
. Sets the span for the Octave Select Switch.
Specialist test equipment is needed to calibrate this trimmer correctly.
FOR MANUFACTURER ADJUSTMENT ONLY
. Sets the V/Oct scaling for the VCO. Specialist
test equipment is needed to calibrate this trimmer correctly.
