[sdiy] AD633

Neil Johnson neil.johnson71 at gmail.com
Thu Dec 26 23:50:49 CET 2019

Hi all,

David wrote:
> Yes, I have an idea.  Use linearized 2164 to make your multipliers for the frequency shifter.  I have a nifty little design I could send you which doesn't require any trimming, and gives very accurate balanced multiplication with a minimum of parts and fuss.

Yes, it's a nice application of the linearised 2164.  Any half-decent
linear VCA can be used in this way.... check out Figure 24 in the
LM13700 datasheet:

For more cookbook examples, try page 50 of ETI from May 1982 which has
some circuit ideas from Tim Orr:


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