<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Of course, Jfets! I may be wrong but I think you get a bit of distortion of the original signal. Ray Wilson used one as a VCA in the Noise Toaster:<div><br></div><div><a href="http://musicfromouterspace.com/analogsynth_new/NOISETOASTER/NOISETOASTER.php">http://musicfromouterspace.com/analogsynth_new/NOISETOASTER/NOISETOASTER.php</a><br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On 8 Feb 2020, at 19:35, Adam Inglis (sdiy) <synthdiy@adambaby.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><span>What about a FET?</span><br><span></span><br><span>page 124 second edition Horowitz and Hill</span><br><span></span><br><span>low parts count!</span><br><span></span><br><span>A</span><br><span></span><br><blockquote type="cite"><span>On 9 Feb 2020, at 4:08 am, Quincas Moreira <quincas@gmail.com> wrote:</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>You can tune the LED brightness and use parallel resistors to get lower resistances as needed, but yes, LDRs are a bit slow to respond, so if you need high speed they are not ideal.</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Sent from my iPad</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><blockquote type="cite"><span>On 8 Feb 2020, at 11:46, Didier Leplae via Synth-diy <synth-diy@synth-diy.org> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>In my experience vactrols seem a bit hard to control and the resistances are very high. </span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>On Feb 8, 2020, at 11:39 AM, Michael Zacherl <sdiy-mz01@blauwurf.info> wrote:</span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>On 08.02.2020, at 18:04, Quincas Moreira <quincas@gmail.com> wrote:</span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>Here's the simplest VC resistor you can make, much easier than using an OTA!</span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>https://youtu.be/8BOnvSQpoGY</span><br></blockquote></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>at the cost of speed, alas. </span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>m.</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>Synth-diy mailing list</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>Synth-diy@synth-diy.org</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>http://synth-diy.org/mailman/listinfo/synth-diy</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>_______________________________________________</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Synth-diy mailing list</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Synth-diy@synth-diy.org</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>http://synth-diy.org/mailman/listinfo/synth-diy</span><br></blockquote></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>_______________________________________________</span><br></blockquote><blockquote type="cite"><span>Synth-diy mailing list</span><br></blockquote><blockquote type="cite"><span>Synth-diy@synth-diy.org</span><br></blockquote><blockquote type="cite"><span>http://synth-diy.org/mailman/listinfo/synth-diy</span><br></blockquote><span></span><br><span></span><br><span>_______________________________________________</span><br><span>Synth-diy mailing list</span><br><span>Synth-diy@synth-diy.org</span><br><span>http://synth-diy.org/mailman/listinfo/synth-diy</span><br></div></blockquote></div></body></html>