<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">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. <div>David Reaves</div><div><br id="lineBreakAtBeginningOfSignature"><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On May 17, 2025, at 07:59, Mattias Rickardsson <mr@analogue.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="auto">...not to mention the 2164 quad VCA, which is widely used since decades back and far less confusing. :-)<div dir="auto"><br></div><div dir="auto">/mr</div><div dir="auto"><br></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">Den lör 17 maj 2025 06:13Oren Leavitt via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> skrev:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">David,<br>
<br>
Welcome to the list!<br>
<br>
The LM13700 datasheet is a good start point for a super simple VCA and <br>
other synth-useful building blocks.<br>
<br>
Check out the searchable SynthDIY archives at<br>
<a href="https://synth-diy.org/pipermail/synth-diy/" rel="noreferrer noreferrer" target="_blank">https://synth-diy.org/pipermail/synth-diy/</a><br>
<br>
- Oren<br>
<br>
On 5/16/25 5:56 PM, david walker via Synth-diy wrote:<br>
> hello i just join you group and would like sum help please i have just <br>
> started working on oscillators tone generators and other bits i hope to <br>
> one day make a synthesiser of sum sort . But i am still learning the <br>
> basics what i would like help with is making a voltage controlled <br>
> amplifier sum thing simples as it can be as i need it to go with the <br>
> envelope generator i have made i hope sum one can help please i would be <br>
> a very big help<br>
<br>
<br>
<br>
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