SIL components, and Re: Thru zero FM

[Rene Schmitz]

JH wrote:
>The Tru zero FM I've retrofitted to a 3340 VCO is a little "dirty"
>around the zero crossing as well. I guess it's the comparator:
>No hysteresis -> prone to oscillation
>Hysteresis -> tends to miss short zero crossings forth and back.

Still worse, the comparitor sees a different zero than the OTA! Ideally one
would have a seperate adjustment for the comparitor. 

I further messed arround with the circuit and placed a 100p cap over the
feedback resistor of IC2b, and the oscillation stopped. The "screaming" is
now gone but the "jumps" are still there.

>Yes that's a big advantage on veroboard or single sided PCBs.
>One reason why I prefer a japanese dual transitor over a 3086
>transistor array.
There are other reasons too. Really, I don't want to revive that discussion, 
but I finally uploaded the measurements I've done for Rbe to my homepage.

>package. Anybody found some useful general purpose SIL audio
>opamps ?

Didn't look yet. But at the Panasonic, Rohm, NEC or Toshiba site one should
find them. (Make sure you got the Reichelt catalog at hand ;-)

Bye
 René

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