[sdiy] VCA LM13600 circuit 2 - matched trannies ?

[Scott Bernardi]

Ideally the BC560 pair should be matched, but it is not as critical in a 
VCA as it is in a VCO. LM13600 can be substituted in this case because 
the output darlington buffer is not being used (that's the only place 
where LM13600 and LM13700 differ).

Linium wrote:

>Hello,
>
>I am in the process of building a bunch of VCA from Jorgen Bergfor VCA 
>Shootout web page.
>
>I am building the circuit 2, LM13600 based, said as the "overall winner".
>
>Some few wonderings, do the BC560 pair need matching ? 
>
>http://www.idg.se/personal/bergfors/bergfotron/vca/lm13600%20vca%202.htm
>
>And is the LM13600 interchangeable with the LM13700 in this circuit?
>
>Thankx,
>
>Linium
>
>  
>