I designed the below circuit.
The relay open above 13V and close below 13V.
How can I make relay open above 14V and close below 12V?
Tell me if the circuit have major problem.
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up.Sign up to join this community
tell me if the circuit have major problem.
Simulation for some positions of pot, dependence to BJT beta and Temperature.
There is some "dispersion". Can "work", but not precisely.
Use comparators (as @Syed suggestion) or certainly differential BJT for comparison ... with, obviously, also a "zener" for "reference" (as Autistic suggestion).
This could be better. Pot2 used for "centering" on usable voltages. R9 scales.
For the last point, one can add hysteresis with another resistor.