All Questions
4
questions
0
votes
1
answer
434
views
PNP Darlington pair as a current limiter
I am trying to analyse what is controlling the load current in the below Darlington configuration.
Is it the base current of transistor Q3 which is controlling current through R14 / emitter current ...
- 328
1
vote
1
answer
80
views
LED strange behavior
I am analyzing ways to make a current limiting circuit, and here I'm having an unexpected problem. The schematic is as follows:
The problem I am encountering is twofold:
Even when node Vin is ...
- 31
2
votes
2
answers
1k
views
Does a BJT optocoupler have an inherently short circuit proof output?
I want to use an NPN optocoupler (ACPL-214) to drive an offboard relay. I know how to size the input resistor to limit the LED current to 20mA. This will cause the output current to be in a certain ...
- 489
1
vote
1
answer
803
views
How to limit current while almost keeping voltage same
I am supposed to design a power supply to a project. I have 3 alternative power supply designs for this purpose. However, one of them sucks huge current while giving enough current. My design is given ...
