[sdiy] Vintage IC "514" ?

houshu at muj.biglobe.ne.jp houshu at muj.biglobe.ne.jp
Tue May 31 16:34:29 CEST 2016

Hello Michael,

It looks like SN76514, an IC for balanced modulator.

Saitama, JAPAN.

----- Original Message -----
From: "Michael Zacherl" <sdiy-mz01 at blauwurf.info>
To: "Sdiy" <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, May 31, 2016 19:29:45
Subject: Re: [sdiy] Vintage IC "514" ?

On 31.May 2016, at 11:53 , Ove Ridé <nitro2k01 at gmail.com> wrote:

> For whatever reason, I can't see the image.

hm, sorry, that’s probably I had to compress it to death after I missed the max size yesterday. :\
anyway, I uploaded it: 

> Could it be an OPA541? Seems to fit the bill.

but that’s a contemporary power part, AFAICT?

Thanks, Michael.

> On 31 May 2016 at 11:42, Michael Zacherl <sdiy-mz01 at blauwurf.info> wrote:
> Hi, in some hand written docs from 1971 (part of a legacy) I found a circuit using a chip labelled “514 TEXAS INST”.
> The application is an audio volume controller, the circuit itself is nothing special, I’d say.
> The schematic looks familiar, but what’s that chip?
> Below is a reproduction of this IC’s internal circuit, 
> from a pencil drawn reproduction of the datasheet diagram (I presume) also in this docs.
> The components are not labelled, the terminals named like below and not numbered.
> Anyone came across this “514” part back then?


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