[sdiy] Vintage IC "514" ?

[Michael Zacherl]

Hello Sam, 

“das ist ein Bingo!”  :)

so the “514” label totally makes sense - for the chips of the 74-Series virtually everybody wrote ’00 or LS00 etc, rarely the entire number on the schematics.
Also the differences in the internal circuit’s drawings clearly are errors.
I’m confident that’s the chip!
Thanks a lot! m.

On 31.May 2016, at 16:34 , houshu at muj.biglobe.ne.jp wrote:

> Hello Michael,
> 
> It looks like SN76514, an IC for balanced modulator.
> http://ukradio.info/SN76514.pdf
> 
> Sam HOSHUYAMA
> 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: 
> http://mz.bluemole.com/d/attachments/unknown-TI_514-part.png
> http://mz.bluemole.com/d/attachments/unknown-TI_514-part.asc
> 
>> 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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