Making a transistor latching relay using BD139 and BD140 transistors is a relatively simple process that can be achieved using readily available components. The latching relay is a useful device in electronic circuits as it provides a stable switching state without the need for constant input.
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How to Make Latching Relay | Set Reset Relay
The Latching or Set Reset Relay is an electronic relay that can maintain its state without the need for continuous power supply. The 555 Timer IC, which is a widely used IC in electronics, can be used to make a latching relay.