A-132-4 Quad Exp VCA


4 identical voltage controlled amplifiers with exponential control scales

Available on backorder

Add to Wishlist
Add to Wishlist
Estimated delivery 21 days
Category: Tags: , , , ,


Module A-132-4 contains four identical voltage controlled amplifiers (VCA) with exponential control scales. Each VCA has two control voltage inputs (C1, C2), a signal input (In) and a signal output (Out). The control voltage inputs C1 and the signal inputs can be normalled by means of internal jumpers, i.e. the corresponding input signals of unit #1 can be connected to the switching contacts of unit #2. Those of unit #2 can be normalled to unit #3 and those of unit #3 to unit #4. If the normalling is not desired the jumpers have to be removed. In addition the sum of all four outputs is available (bottom left socket with the sum sign). Therefore unit #4 has only one control voltage input (only C1, no C2). If desired this socket can be jumpered as control voltage input 2. But then the sum signal is no longer available as a socket (only as an internal pin). For each VCA output a jumper is available that determines if the output signal of the corresponding VCA is added to the sum signal. From the factory all four jumpers are set (i.e. all four VCA output signals are added). By removing of one or more of the jumpers one can choose which VCA output is added to the sum. The jumpers can be replaced by switches too.

Technical notes:

The control scale for each VCA is about 12dB/V (i.e. 1 V CV decrease corresponds to 12dB level decrease and 1 V CV inrease corresponds to 12dB level increase). 0V CV corresponds to about -60dB (i.e. about attenuation by 1000). +5V CV corresponds to about 0dB (i.e. no attenuation or amplification = 1). The full attenuation/amplification range is about -90dB … + 20dB. Attenuations below -60dB require a negative control voltage, amplifications beyond 0dB require a control voltage more than +5V. For the first CV input of each unit (CV1) an internal trimming potentiometer (attenuator) is available to adjust the control scale for other voltage ranges (e.g. 0…+8V for A-140 envelope control or 0…+10V for external 10V control voltages). To obtain another CV scale even for CV2 an attenuator (e.g. A-183-1) can be used. If an amplification offset is required (e.g. for zero-symmetrical control voltages like LFO) an external offset generator with attenuator/polarizer (e.g. A-183-2) is recommended.
It’s possible to modify the module so that the attenuation with 0V CV has a higher value (e.g. -80dB). For this the value of a resistor has to be changed for each VCA (R10, R21, R32, R43). Lowering the existing value (560k) increases the attenuation at 0V CV. But then a control voltage beyond +5V is required to obtain 0dB.

The A-132-4 uses a circuit with four exponential VCAs (SSM2164/V2164). Unfortunately there is no easy way to obtain a linear scale for the VCAs (actually two exponential VCAs are required to obtain a linear VCA, that’s how e.g. the A-132-1 and A-132-3 work). But we are working on a linear version of the A-132-4 (probably named A-132-5).

This document explains the positions and functions of the trimming potentiometers and jumpers: A_132_4_jumper.pdf

Width: 6HP / 30.1 mm
Depth: 60 mm (measured from the rear side of the front panel)
Current: +30mA (+12V), -20mA (-12V)





There are no reviews yet.

Be the first to review “A-132-4 Quad Exp VCA”

Your email address will not be published. Required fields are marked *

Search machineroom.com.ua


Create an account

Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other reasons described in our privacy policy.

Password Recovery

Lost your password? Please enter your username or email address. You will receive a link to create a new password via email.


A-132-4 Quad Exp VCA


Available on backorder