[sdiy] Vintage IC "514" ?

[Michael Zacherl]

Hallo Peter - thanks for that!
I think the internal schematics drawn in this old docs are accurate, as is the µA709 I found in the same docs. (the 709 I could check, the “514” … I just don’t know)
My reproduction if this schematics is - except for the part labels - as I found it in the papers.
Alas, I can’t see how a comparator could help building an audio volume controller.
My point is to complete the docs, not to build the controller - I’d take a VCA or multiplier today.

On 31.May 2016, at 12:39 , Ullrich Peter <Peter.Ullrich at kapsch.net> wrote:

> This could be a TL514 from TI:
> 
> http://www.datasheetarchive.com/dl/Scans-067/DSA2IH00212132.pdf
> 
> also from other suppliers:
> http://www.datasheetarchive.com/dlmain/Databooks-2/Book262-1382.pdf



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