[sdiy] single transistor VCA (was OTA VCA)

Tom Wiltshire tom at electricdruid.net
Sat Mar 25 01:30:07 CET 2017


There's also the Lunetta-inspired "diode VCA":

http://electro-music.com/forum/phpbb-files/vca_env_211.gif

http://electro-music.com/forum/viewtopic.php?t=23960



On 23 Mar 2017, at 16:15, Elain Klopke <functionofform at gmail.com> wrote:

> can I attach a picture or are attachments taboo in the list?
> 
> So I really need the buffer? I will have to order some op amps tomorrow then.
> 
> Right at this moment, I have 0V and +5V at my disposal.
> 
> On Thu, Mar 23, 2017 at 10:30 AM, Mattias Rickardsson <mr at analogue.org> wrote:
> It would help with a schematic of your actual circuit, since almost
> everything seems to differ from the schematic you linked to. :-)
> 
> So, you are connecting the transistor to a small speaker, via the 100k
> resistor? Or without it?
> I wouldn't expect a sound in either case, due to the tiny tiny signal
> (if the 100k is included) or the heavy heavy loading of the transistor
> (if it's not).
> 
> Btw, when changing the 2.5 V points into ground, du you have a CV
> generator that reaches 2.5 V below ground as it needs to do?
> 
> /mr
> 
> On 23 March 2017 at 16:22, Elain Klopke <functionofform at gmail.com> wrote:
> >>
> >> What I mean is... how do you connect and measure things?
> >>
> >
> > I have a tiny speaker. It's worked thus far. My oscilloscope is in another
> > state at the moment.
> 
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