Tagged Questions

7
votes
2answers
272 views

How do I know where to place resistors on my circuit?

Some of the books I have state that power comes from the negative terminal on the power supply.If that is the case, the circuit starts from the negative right? Say I have a simple circuit with a 6v ...
0
votes
1answer
315 views

Switched bleeder resistor on a capacitive power supply

I posted a more vague version of this question a few days ago here and this question was linked as being similar. Answers in both threads were extremely helpful and were along the lines I was ...
1
vote
2answers
131 views

How many watts will the resistor in this naîve PSU dissipate?

One would be inclined to think the average current on resistor R would be exactly the same as in the load L, but I'm not so sure of that fact, due to the effect of the (big, 1000uF+) capacitors. ...
5
votes
2answers
385 views

Limiting the short circuit current of a power supply

I'm using a repurposed ATX power supply for my hobby projects since it's got 3.3/±5/±12 outputs, all of which are really convenient. But one thing I didn't really think about until I slipped my probes ...
1
vote
0answers
155 views

Cigarette lighter case mod [closed]

(Apologies in advance if this question is out of scope of this stackexchange but I wasn't really sure where else to post it. Any help, advice, useful links would be really appreciated though) I have ...
2
votes
4answers
453 views

Limiting current from a 5v power supply [duplicate]

Possible Duplicate: Choosing power supply, how to get the voltage and current ratings? I have a 5V / 1A regulated supply. I'm thinking of using it to power a PCB which asks for 5V and ...
2
votes
5answers
882 views

Variable resistor that can handle hundreds of watts?

We have some big resistor test loads, like 8 Ω 250 W loads for simulating speakers: Are there also big variable load resistors for testing power supplies? What are they called? If not, what do ...
1
vote
1answer
136 views

relationship between temperture, current, thickness, and material

I used lan cable for light LED up on my bread board power source is PC's power supply. without any resistor, the lan cable melt! I reallize I have to keep OHM's law in my mind and use proper ...