On Sun, 01 Mar 2009 22:12:27 -0500, the renowned mlawson
wrote:

I'm trying to put together a comparator using a 741 op amp and the
output goes high as it should, but only goes to about 2volts when it
should be low. I'm only using a 5v single ended supply for power. The +
input to the op amp is set at 2.5v and the - input is the input value to
be compared. There is no feedback resistor and I'm wondering if that
might be the problem. I'm open to any ideas anyone has.
Thanks, Mike Lawson

The 741 won't swing to either supply. Half an LM358 or 1/4 an LM324
will work much better on a single 5V supply (of course op-amps make
slow comparators, and some op-amps will malfunction or fail under this
service).


Best regards,
Spehro Pefhany
--
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