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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Latching a led light with transistors
Andrea De Napoli • 09/02/2017 at 23:23 • 0 comments

At the start condition both transistors and the led light are off, so at the node 2 we have a positive signal.
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Relay based latch circuit
Andrea De Napoli • 09/02/2017 at 23:20 • 0 comments

When you press the button both transistors are enabled, but the coil keeps off because it is supplied by 2,5 Volts.
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