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Circuits designed by David Johnson, P.E.
Last Updated on:
Saturday, December 23, 2017 03:21 PM
List of Dave's Circuit Designs
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More
Relay |
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Bidirectional Solid State Relay
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| The circuit below can
switch up to 4 Amps of current with a peak voltage up to 20v. It is fully
isolated using two inexpensive red LEDs. One LED forms a red light source, which
illuminates a second red LED. The circuit takes advantage of the 1.5v produced
by super bright red LEDs when illuminated with red light. The voltage produced
by one red is routed to two n-channel FETs, configured in a bi-directional switch
circuit. The two FETs selected have a low gate-source threshold voltage, which
allows them to turn on hard from the 1.5v from the red LED. The bi-directional
configuration allows the circuit to switch both AC and DC power. Using quality
super bright red LEDs, the circuit will switch on fully with only 5ma of LED current. |
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Click
on Drawing Below to view PDF version of Schematic |
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