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KOMA ELEKTRONIK - DUAL DISCRETE VCA
USER MANUAL
Dear User,
Thank you for purchasing our Dual Discrete VCA!
The KOMA Dual Discrete VCA offers two independent high quality VCA
channels, both built up out of discrete transistor cells with low CV and au-
dio bleed, very low noise and distortion. The VCA's feature set also enables
you to experiment with the linear/exponential response curve, changing the
dynamics of your sound. Play around with the gain settings for creative dis-
tortion effects in the classic KOMA style:
High quality sound by default, noise by choice!
POWER CONNECTION
A close up of the Power Connector on the back side of the module.
Always make sure you align the red stripe on the power connector to the
white stripe marker on the module.
Made with love in Berlin, Germany.
Questions? Need help?
Please contact us at:
support@koma-elektronik.com
KOMA Elektronik GmbH
Weisestr. 24
12049 Berlin
Germany
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SLOPE CONTROL AND ATTENUATION
The SLOPE control enables you to seamlessly shift be-
tween a linear and exponential curve. Our VCA is de-
signed to operate with CV signals of 0V - 5V.
When using a 5V CV signal, the extreme settings of the
SLOPE control translate to the same perceived loudness,
see 'unity point' in the graph CV Response on the right.
We added attenuators (ATT) on CV Input 1 of Channel
A and CV Input 2 of Channel B, to allow the user to
adjust the incoming CV level. For instance: when you
have a higher CV signal, you can attenuate it down to
the appropriate 5V level.
FEATURES AND FUNCTIONS
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INPUT 1-2 (A+B)
GAIN (A+B)
Input to VCA. Designed
Pre-gain for input signal. Al-
primarily for audio sig-
lows overdriving the input
nals. 100k Impedance.
stage (saturation / distortion).
AC coupled
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SLOPE (A+B)
2
VCA response shape from
CV INPUT 1-2 (A+B)
CV control for VCA Vol-
linear / to exponential.
ume, 100k Impedance.
Fully CCW = linear. Fully
DC coupled.
CW = exponential.
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3
BIAS (A+B)
ATT (A+B)
Manual control of VCA
Attenuator for CV 1 input on
volume. The value of the
channel A and CV 2 input
BIAS control is mixed to-
on channel B. Attenuates the
gether with the incoming
voltage of the incoming CV
CV signal.
signal. Unipolar.
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OUT (A+B)
Output from VCA, 1k
impedance. AC coupled.
CV RESPONSE
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Summary of Contents for Koma Elektronik Dual Discrete VCA
- Page 1 Thank you for purchasing our Dual Discrete VCA! AC coupled SLOPE (A+B) The KOMA Dual Discrete VCA offers two independent high quality VCA VCA response shape from CV INPUT 1-2 (A+B) channels, both built up out of discrete transistor cells with low CV and au- CV control for VCA Vol- linear / to exponential.
- Page 2 KOMA ELEKTRONIK - DUAL DISCRETE VCA FLOW CHART USER MANUAL DISTORTION AND SATURATION To avoid distorting your audio signal, mind the Gain position and start on a lower position. To overdrive your signal, turn the Gain pot further clockwise. See the Saturation Chart for overdrive characteristics.
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