Operating current of 10 mA, with V drop of 1.7V for
. the LED. Calculate to drop any voltage above this
across the limiting resistor, also carrying 10mA. Example,
for 12v Supply, Rlimit = ( 12- 1.7) / 0.01 = 1030 ohms (=1k ).
No diode required, because there is no coil to give back-emf.
Output when Fully ON, voltage drop across
transistors is 0.5V max, and can carry 1 Amp,
Connect load in series with this solid state switch.