[sdiy] AD633

David G Dixon dixon at mail.ubc.ca
Thu Dec 26 01:04:17 CET 2019

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.

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of klangbau
Sent: Wednesday, December 25, 2019 3:30 AM
To: synth-diy at synth-diy.org
Subject: Re: [sdiy] AD633


looking for AD633 to a reasonable price. Ordered a few in
China/ALI-Express in SOP-8 for 3€ each. Same as others I tested last
year; don't work and drive hot after a few seconds. My test circuit is
fine and works with AD633 bought for 10€ each. Need it for my

Any idea?


willi sauter

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