[sdiy] anyone know what this chip is? M334 7161

[Paul Schreiber]

Motorola part. 334 is the date code. I think Motorola had some cheesy VCAs 
in that package (early 80s, I bet the date code is 1983, 34th week).

Paul S.

----- Original Message ----- 
From: "Loscha" <loscha at gmail.com>
To: "Synth-DIY DIY" <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, April 15, 2009 10:18 PM
Subject: [sdiy] anyone know what this chip is? M334 7161


> Afternoon Ladies and Gentlemens.
>
> Please consider the following images:
>  http://www.loscha.com/images/M334-7161.jpg  155k
>  http://www.loscha.com/images/M334-7161_small.jpg  20k
>
>
> There are two of these in a thing called an Orgatron (GTR orgatron 2,
> from the late 60s-ish, an electronic thing, not the electroacoustic
> reed organ thingy).
>
> It was posted about when I first got it on Matrixsynth. Apparantly my
> kid sister is a "Synth Babe". That page it links to is 404, by the
> way, I don't think I have the sample up online anymore. It sounded
> quite crap. A mono square osciallator with a few switched cap static
> filters as "stops".
> http://matrixsynth.blogspot.com/2006/11/gtr-orgatron.html
>
> Has anyone seen this part before? The unit has some stops that are
> octave down, so, thinking it may be a divider. Seems like an "organy"
> type chip, I recall seeing something similar in a Crumar organ/piano I
> had 10 years ago.
>
> Any assistance would be appreciated. Hoping, honestly, that they'll be
> able to be given to someone to repair something worth while, instead
> of this piece of crap I junked & dumped today!!!!!
>
> They are both connected up in a similar fashion.
> Short pin next to trace (the lump) always goes to earth.
> Long pin not on bump end goes to +ve
> They are situated in the section of the circuit which is a volume
> control. Possibly some kind of VCA or amplifying transistor.
>
> It's not in my little "cubic" Tech/Eca Asia Pacigic "Up-To-Date
> World's Transistors-Diodes-Thyristors & ICs Comparison Tables". (the
> Jaycar ones, about 10 years old).
> I'm stumped. Am not even sure what package to call it.
>
> Thanks for your time if you bothered to read my rambling all the same!
>
> -ErJ
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