This is a design circuit for solid state relays but using other methods. This is the figure of the circuit.
This circuit is requires an extra diode to compensate for the voltage drop across the optoisolator transistor when it is conducting. If this diode was not used the transistor in the ULN2003 would not be able to turn off fully. Resistor R2 would also be sized to pass about 1 milliamp and the voltage drop across the drivers internal resistor will have to be taken into account.
This circuit is requires an extra diode to compensate for the voltage drop across the optoisolator transistor when it is conducting. If this diode was not used the transistor in the ULN2003 would not be able to turn off fully. Resistor R2 would also be sized to pass about 1 milliamp and the voltage drop across the drivers internal resistor will have to be taken into account.
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