[sdiy] LM13700 as VC resistor

Quincas Moreira quincas at gmail.com
Sat Feb 8 19:08:55 CET 2020


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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