shacklebolt
New Member
Hi I'm not an EE but I am building a circuit for a project that I'm working on. I built the circuit today but it doesn't work and I think the problem is either how I am am using the LM311N or possibly the NPN transistor.
The idea is:
-The AC voltage is either on or off, when on it is half-wave rectified and smoothed (turns out to be approx. 0.37V) and attached to pin 2.
-In order to set the reference voltage attached to pin 3, the battery voltage is divided (turns out to be approx. 0.17V)
-Ideally, the op amp would compare the two voltages and only output (pin 7) if 0.37VDC is achieved.
-The since i believe the op amp can't handle all the current required to run the motor (could be wrong), I am using an NPN transistor-- this could be part of the problem
Is there some glaring mistake I've made in the design? Am I allowed to ignore the other 3 pins of the op amp?
Thanks,
Peter
The idea is:
-The AC voltage is either on or off, when on it is half-wave rectified and smoothed (turns out to be approx. 0.37V) and attached to pin 2.
-In order to set the reference voltage attached to pin 3, the battery voltage is divided (turns out to be approx. 0.17V)
-Ideally, the op amp would compare the two voltages and only output (pin 7) if 0.37VDC is achieved.
-The since i believe the op amp can't handle all the current required to run the motor (could be wrong), I am using an NPN transistor-- this could be part of the problem
Is there some glaring mistake I've made in the design? Am I allowed to ignore the other 3 pins of the op amp?
Thanks,
Peter