Hay
I need feed back from the solenoids (24V, 300mA) whether they are switched ON/OFF, I am switching the solenoids using micro controller & BDX33 Transistor
I kept shunt resister 1ohm across the emitter and giving the voltage drop to the comparator (non inverting terminal of the LM324) and comparing with ground Point (inverting terminal of the LM324 connected to the ground)
Whenever solenoid is switched ON there will be voltage drop and LM324 switching ON the LED but
Whenever solenoid is switched off there is no voltage drop, both terminals of the LM324 at ground potential, at this point LM324 is comparing the ground potentials and giving the un proper outputs
Please give me the some suggestions
how to compare the volatge with ground point
Regards
chandu
I need feed back from the solenoids (24V, 300mA) whether they are switched ON/OFF, I am switching the solenoids using micro controller & BDX33 Transistor
I kept shunt resister 1ohm across the emitter and giving the voltage drop to the comparator (non inverting terminal of the LM324) and comparing with ground Point (inverting terminal of the LM324 connected to the ground)
Whenever solenoid is switched ON there will be voltage drop and LM324 switching ON the LED but
Whenever solenoid is switched off there is no voltage drop, both terminals of the LM324 at ground potential, at this point LM324 is comparing the ground potentials and giving the un proper outputs
Please give me the some suggestions
how to compare the volatge with ground point
Regards
chandu