Homebuild Synth 4 - Voltage Controlled Amplifier
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Again, fun to view on the scope.
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what exactly does the VCA do in the synthesizer?
barret707 1 year ago
@barret707 - A VCA (Voltage Controlled Amplifier) is used to control the volume of the sound. Some sounds starts at maximum level and fades out. Others fades in and out. Some has the same volume all the way through, and some tremulates between up and down. The VCA does this and is controlled by a voltage that can come from an Envelope Generator or a Low Frequency Oscillator.
organfairy 1 year ago
@organfairy AH cool thanks a million i've started building a mini synth as part of a college project it's just a traingle and a square wave with some trim pot's to tune an octave and im using arcade buttons for key's I've been trying to build an ADSR module based off a 555 timer and the circuit i have need's a VCA.
Could you recomend any good VCA circuit's?
barret707 1 year ago
@barret707 - That depends on your definition of "good". The one I am using here is a differential amplifier. The advantage is that it is build out of parts that can be found everywhere. The downside is that there are quite many components and that it might be nessesary to adjust it a little for noise-free operation.
There is a component called a "variable trans conductance amplifier". It is an integrated VCA that is quite easy to use. You can also go classic with an LED/LDR VCA.
organfairy 1 year ago