<div dir="ltr">Well, if you think about it, the circuits that need a resistor to be changed to a VCR usually don't require any serious degree of precision. For example, a friend was looking for a way to make the tune control of a classic kick voltage controlled. It wouldn't matter all that much if the control characteristic was a bit weird, as long as it works for the whole range without derping out on you.<div><br></div><div>Spiros</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 10, 2020 at 4:37 AM <<a href="mailto:rsdio@audiobanshee.com">rsdio@audiobanshee.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">In addition, a VC resistor might be close to linear to start with, but if you try to lower the resistance using parallel resistors then it will definitely be quite nonlinear in response.<br>
<br>
Of course, if you’re really lucky then you might want that nonlinearity. There aren’t too many situations where it works out perfectly, though.<br>
<br>
Brian<br>
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On Feb 8, 2020, at 10:08 AM, Quincas Moreira <<a href="mailto:quincas@gmail.com" target="_blank">quincas@gmail.com</a>> wrote:<br>
> 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.<br>
> <br>
> On 8 Feb 2020, at 11:46, Didier Leplae via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>> wrote:<br>
>> In my experience vactrols seem a bit hard to control and the resistances are very high. <br>
>> <br>
>> On Feb 8, 2020, at 11:39 AM, Michael Zacherl <<a href="mailto:sdiy-mz01@blauwurf.info" target="_blank">sdiy-mz01@blauwurf.info</a>> wrote:<br>
>>> On 08.02.2020, at 18:04, Quincas Moreira <<a href="mailto:quincas@gmail.com" target="_blank">quincas@gmail.com</a>> wrote:<br>
>>>> Here's the simplest VC resistor you can make, much easier than using an OTA!<br>
>>>> <a href="https://youtu.be/8BOnvSQpoGY" rel="noreferrer" target="_blank">https://youtu.be/8BOnvSQpoGY</a><br>
>>> <br>
>>> at the cost of speed, alas. <br>
>>> m.<br>
> <br>
<br>
<br>
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</blockquote></div>