modified 11 years ago

Can someone tell how many turn that need to change 240v to 30v .. And why the voltmeter not show voltage

00:22:05

Need help .. Tell me better circuit

published 11 years ago

giomix

11 years ago

You used transformer not to transform 220 to 30 vac, but as a filter. You also used voltmeter in short circuit, you have to apply it to resistor and or led terminals.

kobe_teey

11 years ago

What do you mean filter .. Can you explain ..

giomix

11 years ago

To transform voltage you have to link both primary inductor terminals of transformer to 220 and secondary to the rest. You linked one terminal of primary to 220 and one terminal of secondary to 220.

giomix

11 years ago

The ratio between primary and secondary turns Is the ratio between primary and secondary voltage. Vout = Vin*N1/N2

ferlop

11 years ago

Hello Sir, I'll try to explain rather than pointing out your connection mistakes. 1. connect 240vac to primary side only which is the 240 side. 2. connect t he secondary on side of the 30 vol side to ground and the other to the load resistor and led. 3. Connect meter across the output or 30 side of the transformer. I'll redraw the circuit and post a comment for you to see the changes, In the mean time you try at the changes maybe you'll see why it doesn't do what you expect.

ferlop

11 years ago

SEARCH for a circuit called: For kobe_teey

kobe_teey

11 years ago

Tq giomix

kobe_teey

11 years ago

Tq so much ferlop .. You very kind ..

ferlop

11 years ago

kobe_teey, you didn't fix your original circuit as we suggested. What happened?

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