[sdiy] weird PNP/NPN expo questions

Ian Fritz ijfritz at comcast.net
Sat Jul 18 18:49:48 CEST 2009


At 10:27 AM 7/18/2009, David G. Dixon wrote:
> > This is an obsolete method.  Why not just use a standard design?
>
>By "standard design" do you mean a design using either two NPNs for current
>sinking or two PNPs for current sourcing, with common emitters?


Correct.  Then you can add the linear FM via the ref current servo.

Ian




More information about the Synth-diy mailing list