Wiardgroup

For some background information on using the Boogie Filter for 
other filter types, see

http://www.musicsynthesizer.com/Circuitry/Multi-Function%20VC
F.htm

which is the section from the service manual on the Oberheim 
Expander filter. Of course the Boogie Filter uses discrete 
Vactrols rather than the CEM chip for improved noise and 
distortion.

Cell one is the 6 dB output, cell two is the 12 dB output and so 
on. Notice the inverters on the 12 and 24 dB outputs, which 
makes the math "trick" work.

You can get some idea of mixing coefficients from the resistor 
values in the summing networks.

Or just goof around and try stuff!

Hello all,

I am very partial to the Wiard VCO and Waveform City, so I am looking
for one of each....

If you are interested in selling, please contact me off list!

Gary Chang

grant,

i'm not really sure of all the technical details and schematics on
that page, but does that mean the boogie can be patched (i.e. without
extra internal modding/soldering) in a way so as to give lo pass, hi
pass, notch and band pass responses? if so, how?

on another note, i think sam ecoff stated on AH recently that he had
visited you, and that there was a nice surprise in store for all us
wiard fans, any hints or news?

in anticipation ;)

gregg.

p.s. been trying to contact you for a while with regards to an order
we discussed previously, but have got no reply, are you very busy or
is your email software blocking me?

--- In wiardgroup@yahoogroups.com, "grantrichter2001" <grichter@a...>
wrote:

> 
> For some background information on using the Boogie Filter for 
> other filter types, see
> 
> http://www.musicsynthesizer.com/Circuitry/Multi-Function%20VC
> F.htm
> 
> which is the section from the service manual on the Oberheim 
> Expander filter. Of course the Boogie Filter uses discrete 
> Vactrols rather than the CEM chip for improved noise and 
> distortion.
> 
> Cell one is the 6 dB output, cell two is the 12 dB output and so 
> on. Notice the inverters on the 12 and 24 dB outputs, which 
> makes the math "trick" work.
> 
> You can get some idea of mixing coefficients from the resistor 
> values in the summing networks.
> 
> Or just goof around and try stuff!