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mpj111 said:I have 60V ac transformer in handy. That is why I need regulator to produce 12V Dc from this.
Actually This is what I want. There is transformer which produce 40V ac and 40Vdc. This seems to be faulty. I want to replace it with my 60V ac transformer which I have already.
I have a circuit to produce 12V from 40Vdc ( it has big heat zink) . Is it possible to use same circuit with 60V ac.
Much appreciated if you can help me to find few circuits for this purpose.
mpj111 said:Can I do it in this way. I have a transformer to produce 60V ac. If I used a rectifire to make it DC, how much would it be. Does it produce around 50V DC. Then I can use same regulator (from 40 dc to 12V) with few modification such as using a resistor to drop down the input to 40V DC.
mpj111 said:I want to construct a power supply circuit to produce 12V DC.
In put is 60V AC. Need to be supply at least 10A.
Could you please healp me to find such circuit.
Many thanks in advance.
that is true with no load whatsever. good luck trying to get 10A AT PEAK ANYTHING. .639 LOOKS LIKE A GOOD NUMBER TO MEaudioguru said:Hi Zach,
Good idea but the math is incorrect.
12VAC has a peak voltage of 17.0V. A full-wave bridge rectifier will drop 1.4V to 2.0 leaving 15VDC or more at the filter capacitor. 10VAC from the transformer would give slightly more than 12VDC but a 120V to 20V transformer is hard to find.
The transformer's RMS output voltage is rated at its full output current. Its voltage is higher without a load due to its internal resistance.raybo said:that is true with no load whatsever. good luck trying to get 10A AT PEAK ANYTHING.
Hero999 said:How?
That wouldn't work, a light dimmer doesn't alter the voltage it just switches the power on at a set point in the AC cycle, in fact a it will generate harmonics which will actually increase the power dissipation in the transformer and you'll also end up with a dead dimmer as it won't like the inductive transformer as a load.