Patchable modulars

[Peter Ullrich]

Hi !

>> Mitel makes a duplicate of this chip as well.

>Packages: 40 Pin Ceramic DIP
>
>MITEL	MT8816AC
>
>Packages: 40 Pin Plastic DIP
>
>HARRIS	CD22M3494E
>MITEL	MT8816AE
>
>Packages: 44 Pin PLCC (Mitel lead compatible)
>
>HARRIS	CD22M3494MQ
>MITEL	MT8816AP
>
>Packages: 44 Pin PLCC (SGS Lead compatible)
>
>HARRIS	CD22M3494SQ
>SGS	M3494 (sorry, lack details on SGS)

Yes. That is real good information. I worked with the 8816 from Mitel and
they really work fine. I used them to switch TTL-Signals (MIDI-signals after
the optocoupler-interface) and for audio signal (SMPTE-signals, normal (not
HIFI) NF).

Have a look for them - the quality is good enough for synth patching and
they are really easy to control. 

A little tip. Make the RESET-Line of the chip a little bit >slower<. I mean
that you should make the line unsensitive against spikes. If not a little
spike can erase all your patch-connections. Normally a little capacitor
(100p) from the RESET-Line to GND helps ! You can eventually put an 120ohms
resistor from your RESET-generator to the RESET-pin in series (Yes that is
an lopass filter with the capacitor).

Ciao
Peter

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                   Ing. Peter Ullrich      mailto: ullrich at kapsch.co.at
                   http://www.geocities.com/SiliconValley/Heights/3586/
                   Hardware & Software Developer /  Electronic Musician
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