moog hp

[Osamu Hoshuyama]

Schematics of Moog HPF is included in Moog Modular at E-MUSIC DIY
ARCHIVE.

http://aupe.phys.andrews.edu/diy_archive/manuals/moog/modular/

The redrawn schematic (mod_19a.gif) has an error around buffer amp
using NPN and PNP transistors.  Collector of PNP transistor should be
connected to the emitter of NPN transistor for current feedback.
Dots which indicate connection are missing.

> Date:    Tue, 30 Mar 1999 01:39:25 +0200
> From:    jh <jhaible at primus-online.de>
> >Could you explain how close, without having to write a novel. 
> >I would like to know how close I came from the patent info.
> >I would also like to build it like Dr. Moog designed it I 
> >can.
> 
> I remember I've seen the Moog HP somewhere - I even might have
> a paper copy. Haven't seen it for a long time, and surely did no
> circuit comparison - it just looks familiar. Probably discreet buffer
> stages instead of opamps, but my memory is clouded.
> 
> JH.

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 Osamu HOSHUYAMA          Digital Signal Processing Technology Group
   Dr. (Eng.)       C&C Media Research Laboratories, NEC Corporation
               Email: houshu at ccm.CL.nec.co.jp,  Fax: +81-44-856-2232
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