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plz help urgently


neo1

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Hi
please see any datashhet for LM324

it an ic with four similar circuits called comparator.

each one can compare two input signals and out put a +ve voltage or a near earth depending on the comaprision. this just in plain english approximately. for datails see the datasheet  at sl No 12 at
http://www.electronics-lab.com/downloads/datasheets/ic_analog.html

sarma

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please see any datashhet for LM324

it an ic with four similar circuits called comparator.

No, Sarma.
An LM324 has four opamps, not comparators.
An opamp can have negative feedback applied to have any amount of closed-loop gain required. An opamp is fairly slow.
A comparator cannot have negative feedback applied so is used with its full gain of about 200,000. A comparator is fairly fast.

An opamp can be used as a fairly slow comparator.
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