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unkown ic


smokyLED
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I'm trying to find a replacement for an IC in my frequency counter.
It's a 8 pin DIP, and could possible be a opamp. But i'm not sure. I have googled but haven't had any luck.

This is with is printed on the package:
TFK 731 666 BS

TFK666BS seems to be the product code.

Thanks in advance.

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