Copyright © AJHSynth 2018
A Self Osc 2:
Shorting this jumper across both exposed pins connects extra circuitry that forces the
VCF 2 filter core to be self - oscillating at high resonance settings. When the jumper is
only connected to one pin, or removed completely, the filter is in standard vintage
SEM mode and will not go into self oscillation. It is acceptable to have one VCF self
oscillating and the other in vintage SEM mode, or both self oscillating too.
B Self Osc 1:
Shorting this jumper across both exposed pins connects extra circuitry that forces the
VCF 1 filter core to be self - oscillating at high resonance settings. When the jumper is only
connected to one pin, or removed completely, the filter is in standard vintage SEM mode
and will not go into self oscillation.
C Freq 2:
This trimmer adjusts the freqency centre point for the front panel VCF 2 Frequency
control.
Note: For use by experienced technicians only - Only try small adjustments then test tracking again!
D Freq 1:
This trimmer adjusts the freqency centre point for the front panel VCF 1 Frequency
control.
Note: For use by experienced technicians only - Only try small adjustments then test tracking again!
E Scale 2:
This trimmer adjusts the 1V/Octave tracking of VCF 2. Turning it anti-clockwise reduces
(shortens) the scaling and turning clockwise increases scaling.
Note: For use by experienced technicians only - Only try small adjustments then test tracking again!
F Scale 1:
This trimmer adjusts the 1V/Octave tracking of VCF 1. Turning it anti-clockwise reduces
(shortens) the scaling and turning clockwise increases scaling.
Note: For use by experienced technicians only - Only try small adjustments then test tracking again!
D Freq 1
F Scale 1
The Gemini 2412 module is calibrated after manufacture and under normal circumstances should not require any
user adjustment. Trimmers not documented are for manufacturer’s use only and have tamper paint over the adjuster.
We will not accept any modules returned for repair under warranty because the module has been incorrectly adjusted
by users, to correct this and bring the unit back to full working order full calibration will be required, this is a fairly
lengthy process and in this case will be a chargeable service.
Adjustment and Calibration
C Freq 2
E Scale 2
A Self Osc 2
B Self Osc 1
If you need any help using this module or have any technical questions please feel free to contact us at
support@ajhsynth.com
Red Stripe aligns
with -12V as shown
Power Cable
Important note:
