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Latch circuits

Latch circuits based on transistors, to switch on and off a load with a momentary input signal

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Latching a relay coil and a led light

A latch circuit is supposed to lock on and off a load (such as a relay coil or a led light), through a momentary input signal.

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Basically it works like a bistable relay, but backs to the reset condition when the power supply gets off.

In this article I'm  going to talk about two latch circuits I designed and made for hobby purpose.

Both circuits use transistors. The first one latches a relay coil, whose contacts are also used to let the circuit work.

The second one uses just two transistors to latch a led light.

View all 2 project logs

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