[sdiy] Simple, single supply VCA

[karl dalen]

One reason not to use any other single transitor VCA are buy
LM13700 so that it will hint national NOT to disscontinue it.

The noise and distortion can you fix elsewhere outside the VCA,
if you get my hint.

KD 

--- Den tors 2010-02-04 skrev Justin Owen <juzowen at googlemail.com>:

> Från: Justin Owen <juzowen at googlemail.com>
> Ämne: Re: [sdiy] Simple, single supply VCA
> Till: "SDIY List" <synth-diy at dropmix.xs4all.nl>
> Datum: torsdag 4 februari 2010 23.25
> Thanks all,
> 
> I've read about people using the LM13700 with a single
> supply - but I've never seen a schematic using it. Can I
> presume that I'd just follow the same steps as I would for
> adapting a dual supply op amp schematic to single supply -
> i.e. send the negative supply pin to GND and bias any inputs
> to VCC/2 (or whatever)?
> 
> Can i presume that you're all using the VCA circuit that I
> seem to remember being in the 13700 datasheet or is there
> something better about?
> 
> I'm going to tuck the embarrassing question in right about
> here... Some of you referred to the *two* transistor MS20
> VCA... on the schematic if Q19 (C945 Selected) is the first
> transistor - where's the second?
> 
> For the record - my description of a *single* transistor
> VCA wasn't a typo - but I did say I'd had mixed results!
> 
> J
> 
> -----Original Message-----
> From: Paul Perry [pfperry at melbpc.org.au]
> Received: 04.02.2010 01:23:10
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Simple, single supply VCA
> 
> I've had the LM13700 work fine as a VCA on 9v,
> with (as Karl says ) the right biassing.
> 
> I suppose the minimalist approach is the two transistor 
> setup in the MS20, though it is noisy (in my opinion)
> and I think you have to select the transistors, never fun.
> 
> Some ideas in this thread at electromusi9c forum
> http://electro-music.com/forum/topic-33190.html&postorder=asc
> includig links to Jurgen Habile's applications.
> 
> paul perry Melbourne Australia
> 
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