DiY 808 question

[Andrew Schrock]

Midwest Analog Products has a "drum cookbook" which has a lot of neat
twin-T and simple filter/VCA circuits which work really well. Their
ADV-Bass is based around these circuits and reproduces a nice tight snare
or long decaying kick really well. Sometimes the sounds need a bit of
external compression or filtering, but you would probably do that to an
808/909 anyways. 

3904's/3906's will work fine. Not sure about the 4558's. 

later
Andrew

-| Andrew Schrock | aschrock at cs.brandeis.edu |-

On Tue, 9 Mar 1999 DCMagnuson at aol.com wrote:
> I've just decided to build myself a few modded 808/606 drum sounds (kick and
> snare to start with).  My question revolves around op-amp selection for the
> twin-T network.   The 606 appears to use JRC2904, and the 808 seems to use
> 4558's.  Is there any specific specs to watch for when choosing an op-amp in
> this circuit?
> 
> Also, how about the transistors?  Will the usual 3904/3906 work in this
> circuit?
> 
> Thanks in advance, I just want a little more boom than my R-5 will give me ;)
> 
> Dave Magnuson
> Independent Music Site
> http://members.aol.com/dcmagnuson
>