DC 12V Single-Channel Voltage Comparator Relay Module LM393N
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Prices updated: 12 Oct 2026
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About this product
A 12 V single-channel voltage comparator module built around an LM393N comparator, with a relay output. The relay closes when the input voltage is above the reference set by the adjustable potentiometer, and the module can also compare two voltage signals. Useful for threshold switching and simple voltage-controlled automation.
Specifications
- Supply voltage
- DC 12 V
- Current
- 30 mA (as listed)
- Comparator IC
- LM393N (LM339 also mentioned)
- Channels
- 1
- Output
- Relay / ريلي
- Reference adjustment
- Adjustable potentiometer / مقاومة متغيرة
Frequently asked questions
How does the relay respond to the input voltage?
When the input voltage is higher than the reference set by the potentiometer, the relay closes. When it is lower, the relay does not operate.
Can it switch a load directly?
Check the relay's contact rating before connecting a load. For motors or heavier loads, use the relay contacts to drive a suitable driver stage.
