[sdiy] Equiv of LM3900?

[Steve Ridley]

> What would be a good replacement of a LM3900, which seems less than easy
to get
> were I am?

You could try the LM2900, or the MC3301 or MC3302.

> Any quadruple opamp like a TL074?

The LM3900 (and the ones I've lsited above) are current difference
opamps.  You can't just substitute any "normal" opamp.  (Actually
you can, but then it won't work).



Steve Ridley