[sdiy] What is this IC?

[Michael E. Caloroso]

Scott Stites wrote:
> Hi,
> 
> I'm hoping someone on the list can help me identify an IC - I have a tube of
> ten of them, and I'd like to know if they would be useful in any synth
> endeavours.
> 
> They're 14 pin DIP's labeled '221-235'.  Beneath that, they have '014
> M8151' printed on them.  There is no manufacturer identifier on them.  I've
> googled and found nothing.  Does anybody know what these things might be?

I don't recognize any of those numbers, the absence of a manufacturer 
identifier suggests that they are selected parts and remarked.  "M8151" 
could be a date code.

Builders are known to select OEM ICs for tighter parameters.  Some of 
them mark them with their own part #, obliterating the manufacturer ID.

MC