[sdiy] Moog-type highpass filter

[Yves Usson]

Hi

There are small design mistake in this EFm schemo, for example the  
collector resistor of the PNP should
be 2.2K if one use a symmetrical power, the unbalance 2.2K/1K between  
the NPN and PNP of a complementary pair
was due in the original Moog circuit to the fact that the PSU was  
unsymetrical : -6V/+12V

If you want to experiment with this circuit I would rather recommand  
to start on the basis of Osamu Hoshuyama's
design :
http://www5b.biglobe.ne.jp/~houshu/synth/Vchp0302.GIF

Cheers

Yves, yusynth

Le 22 avr. 10 à 09:12, Aaron Lanterman a écrit :

> One of my students is going to try building this:
>
> http://www.synthdiy.com/files/2008/moog-hp.pdf
>
> It looks pretty straightforward.
>
> Any obvious "gotchas" jump out at anyone?
>
> I'm not sure what the 100K to ground at the positive terminal of  
> the "output" op amp on the right is doing...
>
> - Aaron
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-------------------------------------------------
Yves Usson
email :       yves.usson at yusynth.net
web site :    http://yusynth.net