[sdiy] LM13700 as VC resistor

Adam Inglis (sdiy) synthdiy at adambaby.com
Sun Feb 9 02:33:12 CET 2020


What about a FET?

page 124 second edition Horowitz and Hill

low parts count!

A

> On 9 Feb 2020, at 4:08 am, Quincas Moreira <quincas at gmail.com> wrote:
> 
> 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.
> 
> 
> Sent from my iPad
> 
>> On 8 Feb 2020, at 11:46, Didier Leplae via Synth-diy <synth-diy at synth-diy.org> wrote:
>> 
>> In my experience vactrols seem a bit hard to control and the resistances are very high. 
>> 
>>>> On Feb 8, 2020, at 11:39 AM, Michael Zacherl <sdiy-mz01 at blauwurf.info> wrote:
>>>> 
>>>> On 08.02.2020, at 18:04, Quincas Moreira <quincas at gmail.com> wrote:
>>>> 
>>>> Here's the simplest VC resistor you can make, much easier than using an OTA!
>>>> https://youtu.be/8BOnvSQpoGY
>>> 
>>> at the cost of speed, alas. 
>>> m.
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>> 
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