Four quadrant multipliers:Results of my searching

[KallKorvI Smörpapper]

> >> What does the 633 have that you cannot get with a RC4200,
> >> a LM13700 or a 1496 ?
> >> Right, I see, minimum part count. But you can solder a lot
> >> of resistors in the time it takes to track down such a rare chip.
> >For a DIY yes, but when in commercial buissness, no. Each trimmer is
> >expensive then. Laser-trimming reduces the need.
> >
>If you want to make a ringmod without noticeable bleedthru with a 633,
>you need trimmers, believe me.
>And, if you want to do it with a LM13700, you need MORE thn trimmers,
>you need a miracle (in my experience).

I have noticed some problems to get the bleed trough
to allmost zero, its tricky but it i possible.
A interesting aproach is to use modulate the
current to voltage converting reistor
OTA output+ reistor to GND)with the modulating signal.

Or another interesting approach is by using a fet
instead of a resistor to GND you get a ring mod plus
VCA function in one 1/2 LM131700/Ne5517.

Reg
kallkorvismörpapper

>paul perry emlbourne australia

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