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Solinide Feed back - no voltage drop when solenoid is off
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narithota



Joined: 21 Apr 2006
Posts: 85
Post16 Apr 2009 11:58   

Solinide Feed back
Hay

I need feed back from the solenoids (24V, 300mA) whether they are switched ON/OFF, I am switching the solenoids using micro controller & IRF510
I kept a resister 1 ohm across the Source to ground 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 output switch ON the LED.this led is gives the feedback of the solinide
but Whenever solenoid is switched off there is no voltage drop, both terminals(+ve,-ve) of the LM324 at ground potential, at this point LM324 is comparing the ground potentials and giving the un proper outputs
Please give the some suggestions.

Regards
nari
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erikl



Joined: 09 Sep 2008
Posts: 736
Helped: 138
Location: Germany
Post18 Apr 2009 23:19   

Solinide Feed back
Set a small positive voltage level (~100mV) to the inverting input.
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