4
votes
3answers
309 views

Building a power supply, want to stay alive

I am building a power supply for a very old laptop. The circuit uses a transformer (220 V primary to 15 V secondary, 33 VA) and that worries me a little. (Please note that I an enthusiast and so far I ...
6
votes
1answer
842 views

'Voltage Fuse' or better

I have a power supply with multiple outputs (5v, 12, 24v) According to the manufacture (and after testing) there must be a minimum load on the PSU for it to supply the stated voltages. Without a ...
2
votes
2answers
153 views

Negative Voltage Breakers?

I've been reading a bit on negative voltage, but I have a question that will probably reveal some ignorance, so I apologize ahead of time. If someone tells me that they want a (2) 5A breakers, (1) ...
1
vote
2answers
1k views

Where should I put the fuse in this circuit ? Critic the design

I've the following circuit , that used to measure the current through shunt resistance , The circuit have analog & digital ground , the terminals 1 ,2 ,3 are for AC source . I need to protect ...
2
votes
3answers
816 views

How can I design a robust and professional power supply circuit?

I'm planning on doing a large project that would include an ARM microcontroller @ 50 MHz interfacing with a graphic LCD, user buttons, some sensors and some actuators (DC motors, valves) controlled ...