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Voltage-Controlled Amplifier (VCA) | The Synthesizer …
http://synthesizeracademy.com/voltage-controlled-amplifier-vca/
A VCA, or Voltage-Controlled Amplifier, lets you use a voltage to control the amount of another signal that is allowed through to the output of the module. The higher the control voltage, the more signal is passed. At some voltage level, the entire …
Synth schematics--::--VCA
https://www.schmitzbits.de/vca.html
VCA-2 is a more streamlined version of VCA-1, the circuit has also an inverting input to simulate ringmodulation via a nulling method. One problem of these discrete VCAs is thermal drift of the transistors, this causes the CV rejection to vary (As was pointed out by Jörgen Bergfors). The best cure for this would be to use a dual transistor ...
VCA Techniques Investigated - sound-au.com
https://sound-au.com/articles/vca-techniques.html
A VCA (voltage controlled amplifier/ attenuator) is the heart of any compressor or peak limiter circuit, and there are quite a few different approaches. All available circuits have limitations, and this article looks at the various techniques used. VCAs are also used to provide mixing desk automation, noise gates, 'de-essers' (sibilance ...
Eddy Bergman.com: Synthesizer Build part-10: THE VCA …
https://www.eddybergman.com/2019/12/synthesizer-build-part-10-voltage.html
From there the audio signal goes to a stereo RCA output on the back of my synthesizer and from there to the Line-In of my HiFi Audio Amplifier. Below is a picture of the double VCA that I built on April 25th and 26th of 2020 from the same schematic and layout. These VCA's work like a charm!
Design a Eurorack “Vintage VCA” with the LM13700 ...
https://electricdruid.net/design-a-eurorack-vintage-vca-with-the-lm13700/
We’ll design a simple linear “Vintage VCA”. A Eurorack VCA with the LM13700. Let’s assume we want +/-5V (10V pp) input and output signals, and let’s design for a 0→5V control voltage (gain CV) level. The audio signal levels are pretty standard, but Eurorack envelope modules vary in the output level they provide.
Simple VCA - yusynth.net
http://yusynth.net/Modular/EN/VCA/index.html
The schematic is rather simple. U1a (1/2 TL072) sums up and inverts the two inputs. Q1 and Q2 are connected as a differential stage, it is a good practice to have these two trannies matched or to use a dual transistor such as a 2SC1583. U1b (1/2 TL072) is used as a differential unit gain "amplifier". Voltage control of the circuit is based ...
Synth Schematics --:: Vacuum Tube VCA
https://www.schmitzbits.de/vtvca.html
This circuit started out from a few experiments I did with subminiature (pencil) tubes. I built a version of Eric Barbours VCA, upon which this design is based. The size of these tubes made it appear feasible to try to build a more complicated VCA, which improves the control rejection compared to the single ended circuit of Eric Barbour.
Simple VCA schematic? : synthdiy - reddit
https://www.reddit.com/r/synthdiy/comments/isu1yj/simple_vca_schematic/
Here's the MiaW video and here's a schematic (the actual VCA is in the middle, and relies on the LED driver circuit at the bottom and the inverting amplifier in the upper middle/right. If you're building this as a module, you can skip the stuff at the bottom left, that's just generating a virtual ground so it can run off of single supply).
CEM3381 Dual VCA - Music Electronics Forum
https://music-electronics-forum.com/forum/music-electronics/47796-cem3381-dual-vca/page2
Share. Tweet. #16. 06-02-2018, 03:48 AM. Originally posted by J M Fahey View Post. Schematic mentions CEM3381 . Hope they are the same (they should) IF you are troubleshooting just the power amp board, you must feed proper audio and control voltages to PA381 or it´s just a volume control set to 0.
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