Dick,
http://pw2.netcom.com/~shammon1/equip.htm
Here is a page from my site. I use the op-27's in all the amps I build.
op-07, op-27, and op-37 are all in the same family. Should you ever use the
op-37 make certain the gain is set above 10 or it will not work. The op-07
and op-27 don't have this requirement.
Regards, Steve Hammond PSN Aptos, California

-----Original Message-----
From: Erich Kern 
To: psn-l@.............. 
Date: Sunday, June 25, 2000 12:23 PM
Subject: Re: Unknown IC


>Dick,
>I agree with Brett that 8112 is the date code, 12th week of 1981. Sounds
like
>it's an OP-27 low noise op-amp. PMI is Precision Monolithics Inc.which no
>longer exists, but the OP-27 is made by Texas Instruments and Analog
Devices. I
>got some from the Jameco catalog.
>Regards,
>Erich Kern
>
>
>-----Original Message-----
>From: Dick Webb 
>To: psn-l@.............. 
>Date: Sunday, June 25, 2000 10:53 AM
>Subject: Re: Unknown IC
>
>
>Reading the chip a little more diligently I find that it says:
>
>PMI.OP
>27   FZ
>8112
>
>Does that help anyone with ideas?
>
>Dick
>
>At 01:18 PM 06/25/2000 -0400, you wrote:
>>At 12:04 PM 6/25/2000 -0400, you wrote:
>>
>>>Hi,
>>>
>>>I recently obtained an amplifier board that has an IC on it that I can't
>>>identify.  It is hard to read but seems to say that it comes from SMI and
>>>has the number 8112.  It is from the early 80's.  Do any of you know what
>>>it is, what it's voltage requirements are and it's pin configuration.
>>>
>>>Dick
>>
>>Dick,
>>Is it possible there are other numbers on it?  There's a good chance that
>>8112 means the 12th week of 1981, which is not out of line with your
>>"early 80's".
>>
>>Brett
>>
>>
>>
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