MS20 Filter

[tomg]

> > Hi,
> > has anyone built the MS 20 filter from 'Tom's Synth Cookbook' on the 
> > Electronics  for Musicians web site?

Bunches of people it's part of the MM!

> sorry that is the Electronics For Music web site:
> 
> http://www.mindspring.com/~vco/cbook/cookbook.html
> 
> 
> I have used 4148 diodes maybe thats the problem?

Nope not a problem.

> For the .002 caps (I presume .002uF) I have used 2200pF multilayer resin dipped 
> plate ceramic caps and for the 10u I have used electrolytics cans.
> 
> any comments?
> ....Keith Winstanley

Again it's all ok..

> > I have built one as a dual HP/LP filter and while I am getting a signal 
> > through the filtering is very weedy as is the resonance, I can hear the 
> > circuit working in some way but there is obviously something awry. I have 
> > already corrected the leg configuration on the 2N3906 although it caught me 
> > out to begin with.
> > I am wondering if I am using the correct type of caps?
> > If anyone has any experience of this project and has any tips please let me 
> > know.-

Sounds like a flaky or open gnd. If you have a meter check all gnd connections.

-tg