[sdiy] voltage controlled amplifier

[Oren Leavitt]

The PAiA 2720 VCA was a nice example

On 5/17/25 4:52 AM, rrsounds wrote:
> I know you’re looking for “simple” but making your own VCA from three 
> transistors (a differential pair with a common current sink) and an op- 
> amp is a lot of fun to experiment with.
> David Reaves
> 
> Sent from my iPhone
> 
>> On May 17, 2025, at 07:59, Mattias Rickardsson <mr at analogue.org> wrote:
>>
>> 
>> ...not to mention the 2164 quad VCA, which is widely used since 
>> decades back and far less confusing. :-)
>>
>> /mr
>>
>>
>> Den lör 17 maj 2025 06:13Oren Leavitt via Synth-diy <synth-diy at synth- 
>> diy.org <mailto:synth-diy at synth-diy.org>> skrev:
>>
>>     David,
>>
>>     Welcome to the list!
>>
>>     The LM13700 datasheet is a good start point for a super simple VCA
>>     and
>>     other synth-useful building blocks.
>>
>>     Check out the searchable SynthDIY archives at
>>     https://synth-diy.org/pipermail/synth-diy/ <https://synth-diy.org/
>>     pipermail/synth-diy/>
>>
>>     - Oren
>>
>>     On 5/16/25 5:56 PM, david walker via Synth-diy wrote:
>>     > hello i just join you group and would like sum help please i
>>     have just
>>     > started working on oscillators tone generators and other bits i
>>     hope to
>>     > one day make a synthesiser of sum sort . But i am still learning
>>     the
>>     > basics what i would like help with is making a voltage controlled
>>     > amplifier sum thing simples as it can be as i need it to go with
>>     the
>>     > envelope generator i have made i hope sum one can help please i
>>     would be
>>     > a very big help
>>
>>
>>
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