Tagged Questions

4
votes
3answers
152 views

Driving Permanent Magnet DC Motor via PWM

SUMMARY: I am currently trying to finish up a DIY project I've been working on for a while: Building an electric potters wheel. I acquired a treadmill and salvaged quite a few good parts from it, and ...
2
votes
1answer
120 views

Common DC ground with two bridge rectifiers

I have an old AC transformer with many taps off it at different voltages. Connecting a voltmeter to tap 2 and tap 3 gives 25V and connecting it to 3 and 4 gives 5V. I connected them to two bridge ...
1
vote
1answer
120 views

Can I use more diodes to reduce the voltage off a diode bridge?

I have a transformer labeled as providing 9Vac, 3.36 A. It appears to provide 9.4 v ac according to my multimeter. It runs through a diode bridge (WAB 040 diodes -- already fried the last version), ...
2
votes
3answers
245 views

How can I power and dim two sets of LED lights where one requires12VAC and one 12VDC

I am building a wall unit and I would like to use some LED Tape Light (12VDC, 48ft Total 1.45W/Foot) to light the shelves. Then I'd like to use a 12VAC adjustable LED spot light (5W) for the center ...
2
votes
3answers
419 views

AC heater, bridge and MOSFET, possible?

In my project I already have all the circuits for a PWM driving some high power MOSFET. Now the hardware guys are coming with this AC heater, and I've been breaking my head around Triacs and phase ...
1
vote
1answer
373 views

Electric circuit AC plug to DC Design Help

I'm new to designing electric circuits... but I have a simple project that I really need help on. All I need is a AC plug source to be connected to a 100 WATT bulb and a 3V motor(motor should only ...
1
vote
2answers
579 views

What do we use to convert AC to DC current in houses

Do we use an active or passive rectifier to convert AC current to DC current, and why?
1
vote
1answer
483 views

Regulated DC supply - need help with calculations

I am in the process of making a regulated power supply to convert AC(220V, 60Hz) to DC(9V, 500ma). I have worked out all the calculations and would appreciate if someone could double check just to ...
2
votes
3answers
3k views

What happens if an AC voltage is applied to a battery?

Today I was checking the voltage between charging terminals going to the battery of emergency lantern using a multimeter. The multimeter showed a DC voltage of 9V and an AC voltage of 4V. Could ...