Solid State Latching Relay Circuit

Posted on Sep 9, 2012

This simple circuit provides a solid-state equivalent of the electromechanical latching relay (see the figure). What`s more, the switching is clean, highly resistant to vibration and shock, and isn`t sensitive to magnetic fields or position. The circuit operates as follows: a set pulse to the 4043 RS latch takes its output high and turn on the 2N3904 transistor. Current will then flow through the photovoltaic relay`s LED and the resistance between D1 and D2 will fall from several gigaohms to less than 30.

Solid State Latching Relay Circuit
Click here to download the full size of the above Circuit.

The PVR will remain in this state until a reset pulse is received by the 4043 RS latch.

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