Op-amps and comparators

By James S.

DC-458 Comparator Module

I cannot remember what exactly I took this module from, possibly a VCR or power supply, but either way it's a handy module. I've worked out the circuit myself, which you can find below, which I've done my best to make sure it's accurate but there are possibly mistakes.

It's a simple circuit that uses a LM393 dual comparator IC (only one of the comparators has been used) with a transistor output stage. I've included a test circuit that lights an LED when the LDR is in darkness.

Here is a photo of the module:

You can email me at james.boshikoopa@gmail.com

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Originally the module was soldered to the main board but you could use a connector or replace the pins with wires.