[sdiy] returning to the chronic disappointment of the 1496...

[jhaible at debitel.net]

With a 1496 and carefull trimming, you get about the same bleedthru rejection as
with an untrimmed 633.

You need to trim the quadratic terms, too - not just the linear feedthru.
Whithout that, you can minimize the bleedthru of the carrier frequency, but
still have a considerable amount of *twice* the carrier frequency.
First RM where I saw this done (not necessarily where it was invented) was the
Ring Modulator in the EMS VCS3, BTW.

Take a look at my FS-1a circuit to see what I mean. (You may even consider
buying a PCB just for the two ring mods, and omit the audio compander and QVCO
stuff, instead of designing it from scratch.)

JH.



> Has anyone found any workarounds for the signal bleed-through problems
> with 1496s used as 4Q-Multipliers?
> I've read and re-read mailing list archives, message boards, and tried
> almost all the schematics I could find...I cannot seem to get the two
> signals to actually *balance* with real precision.
> 
> With the 633s and 1495s off the market, there has to be a cheap,
> effective solution to ring modulation, right? Have OTA approaches
> yielded worthwhile results?
> -AP
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