All Questions
Tagged with current-limiting transistors
38
questions
0
votes
1
answer
1k
views
Current limitation of a power supply by using transistors
DALI standard limits the maximum current as 250mA. I have a 12V source that is capable of supplying more current. I implemented from one of Motorola reference design the below schematics that limits ...
- 3,305
3
votes
1
answer
4k
views
Designing a current limiting circuit for my project
I've got a small DC brushless motor for which I would like to set a current limiting circuit as a protection against over-current.
I thought I could pull it off with a simple fuse (or those current ...
- 31
4
votes
1
answer
7k
views
Need help calculating resistor values for IR LED Driver
I'm wiring an IR LED driver for an Arduino project I'm prototyping.
The Arduino will be run at 5V, and I'm planning on using it's 5V output to drive the transistor that runs the LED
The circuit I've ...
- 1,418
4
votes
1
answer
1k
views
Does this circuit regulate current?
I am being told that the circuit below will regulate current, I am wondering how true that is and how exactly does it do it if so. As far as I can tell: two NPN transistor with their bases biased by ...
- 58
1
vote
2
answers
3k
views
How to limit base current in transistor when collector current is unknown?
In the followig circuit I am trying to replace a push button with a transistor:
simulate this circuit – Schematic created using CircuitLab
In the schematic SW1 is the push button that opens ...
- 323
2
votes
2
answers
2k
views
Transistor current limit circuit - power handling?
I am designing a simple current limiter, which charges a large (4.7mF) capacitor with a charge current of (roughly) 500mA from a supply voltage from about 10-20V - see the below circuit.
My dilemma ...
- 1,504
5
votes
1
answer
14k
views
Current limiters using transistors and diodes
I have been experimenting with simulating current limiting circuits. I am trying to limit current to ~500mA given a fixed 4.8V source. I started a question based on a conventional 2-transistor current ...
- 1,341
8
votes
3
answers
13k
views
Help needed optimising simple current limiting circuit
I have been experimenting with simulating current limiting circuits. I am trying to limit current to ~500mA given a fixed 4.8V source. I have started using a circuit like the one found on this ...
- 1,341