[chbot] Circuit help please, low voltage cutout
Mon, 23 Apr 2007 00:53:37 +1200
Ive been looking at this circuit for my bot's battery protector circuit:
There are a couple of things I don't understand about it:
a. Whats the point of ZD1? How does its value effect the cutout voltage
which I thought was determined by the voltage divider involving VR1?
b. Can Q2 be replaced by a normal transistor and a relay? is the choice
of a mosfet because it will use less power than a relay?
I know it was mooted that i could do it by using a voltage divider to
one of the pics ADC pins etc, but i want it to cover all of the
circuitry on the bot (even if the controller is disconnected).
I will probably still monitor the voltage into the controller to
determine bot behavior but thats a ways off yet.