[sdiy] Equiv of LM3900?

[patchell]

    The RC4136 is not a Norton (transresistance) amplifier.  It is a standard
voltage mode opamp.


    Speaking of LM3900's, I have always wanted to try one of the filters that uses
a pair of transistors (connected differentially) with a current control to control
the cutoff frequency (I think this is refered to as the Arp Filter).  Just how
well (both electronically ad soundwise) does this really work?

Synth-DIY wrote:

> ijfritz at earthlink.net skriver:
> >An upgraded Norton amplifier is the LM359. It is much faster than the 3900,
> >which it is intended to replace. DigiKey has them.
>
> Thank you (and everyone else). I found that one on Farnell.
> After some more search there, they lists RC4136 as a replacement for the 3900.
>
> Thanks all for the help!
>
> Per Mattsson

--
 -Jim
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