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Resistance comparison test

Overview

The LM393 dual voltage comparator is used to detect the resistance value under test. When the voltage at the non-inverting input (IN+) is higher than the voltage at the inverting input (IN-), the output (OUT) will be high; conversely, when the voltage at the non-inverting input is lower than the voltage at the inverting input, the output will be low. The current circuit's non-inverting input (IN+) is input via a voltage divider from the sampling resistor and compared with the resistance value under test (IN-). When the resistance value under test is less than the sampling resistance value, a Darlington relay is driven to output a value.
This can be used for quickly screening products with resistance values within a suitable range.

Design Files

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Update:2026-03-27 00:42:00

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