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<DIV dir=ltr align=left><SPAN class=857172704-27062017><FONT color=#0000ff
size=2 face=Arial>You should also realize that the 2164 is a current amp.
I know that the datasheet says that the absolute maximum voltage of the input is
the rail voltage, but one never feeds a voltage source directly to 2164.
One drops the voltage across an input resistor (usual 30k) because the input pin
is at virtual ground. Hence, assuming a +15V supply, the largest current
the input pin ever sees is about 500uA. If the rail is connected directly
to the input pin, who knows what the input current is -- possibly enough to fry
the chip, I guess. </FONT></SPAN></DIV>
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<DIV dir=ltr align=left><FONT size=2 face=Tahoma><B>From:</B> Synth-diy
[mailto:synth-diy-bounces@synth-diy.org] <B>On Behalf Of </B>Sean
Ellis<BR><B>Sent:</B> Monday, June 26, 2017 6:48 PM<BR><B>To:</B>
synth-diy@synth-diy.org<BR><B>Subject:</B> [sdiy] 2164 overvoltage
condition?<BR></FONT><BR></DIV>
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<P>I've been breadboarding a filter and oscillator using a single 2164 and I
think I just fried my only 2164 on hand. I have the power supply protected but
accidentally put -12 straight into the input of one amp (the control pin was
at about 2.5V) and suddenly it died. The datasheet specifies the max ratings
to the supply rails so I don't get why it could have (seemingly) destroyed the
chip. Could it maybe have caused excessive heat?</P>
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<P>-Sean<BR></P></DIV></BLOCKQUOTE></BODY></HTML>