Summary of Contents for Oakley Sound Euro Rack Classic VCA
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Page 1: User Manual
Oakley Sound Systems Euro Rack Series Classic VCA Discrete Core Voltage Controlled Amplifier User Manual V2.2 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom... - Page 2 Introduction This is the User Manual for the Classic VCA 3U module from Oakley Sound. This document contains an overview of the operation of the unit and the calibration procedure For the Builder's Guide, which contains a basic introduction to the board, a full parts list for...
- Page 3 The Oakley Classic VCA This is a vintage voltage controlled amplifier design. It is based on the classic ARP4019 sub- module which was used on the wooden case ARP2600P semi-modular synthesiser. The design has a fully discrete core but uses a single high quality audio op-amp for output amplification. The unit features both linear and exponential control voltage (CV) inputs.
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Page 4: Power Supply
Power Supply This module is designed to run from a plus and minus 12V supply. These should be adequately regulated. The current consumption is about 20 mA per rail. The power header is labelled PSU on the circuit board and is a standard 10 pin Doepfer style power supply connection. - Page 5 Using the Classic VCA What is a VCA? The VCA (Voltage controlled Amplifier) is a device used to control the level of one signal by the application of another. Traditionally, the controlled input to the VCA is called the INPUT, whilst the controller input is called the CV, or control voltage.
- Page 6 Trimmers There are three trimmers on the issue 2 PCB which need adjusting correctly to get the best out of the VCA module. It is beneficial to adjust these in your own modular as the settings are affected slightly by the power supply voltages. Allow the modular and VCA module to warm up for at least 15 minutes.
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Page 7: Final Comments
I hope you enjoy using the Oakley Classic VCA If you have any problems with the module, an excellent source of support is the Oakley Sound Forum at Muffwiggler.com. Paul Darlow and I are on this group, as well as many other users and builders of Oakley modules.