- #1
Jimmy87
- 686
- 17
Homework Statement
Please see circuit diagram attached which I am struggling to understand. The question is: explain in detail the action of the circuit as VA changes from –5.0V to +5.0V. I have looked through my textbook and I can see that when VA reaches +5V the base of the transistor switches it on but I have little understanding of what is going on. Why does the transistor not work when the base is at -5V? Also, when the base is at +5V I don't understand how current can flow up to the relay because the voltage at the top of the circuit is also at +5V?
Homework Equations
None
The Attempt at a Solution
Tried looking through relevant sections in textbook