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Old 20th November 2012, 12:48 AM   #1
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Default 7815T in a TO-220 package

Can a 7815T use AC power? I am trying to drop a bipolar 30 vac power supply to 15vac bipolar.
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Old 20th November 2012, 01:32 AM   #2
glennb is offline glennb  Australia
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No, 7815 and its ilk are DC regulators. To drop an AC voltage you should use a transformer. Resistors could also be used if current is constant and you don't mind wasting power. Can you explain what you mean by bipolar?
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Old 20th November 2012, 04:30 PM   #3
Elvee is online now Elvee  Belgium
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This circuit will divide an AC voltage by 2 (or any other ratio).

It is probably a good solution to the wrong problem, but here it is anyway:
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Old 20th November 2012, 06:46 PM   #4
MarianB is offline MarianB  Romania
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LM317 can regulate AC current, it's pdf has already a sugestion in the matter.
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Old 20th November 2012, 08:35 PM   #5
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Quote:
Originally Posted by MarianB View Post
LM317 can regulate AC current, it's pdf has already a sugestion in the matter.
that will make a very very dirty AC, will need much filtering
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Old 20th November 2012, 08:47 PM   #6
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~15V zener diodes back to back will chop the AC, but it would help to know just what/why the OP is trying to achieve.
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Old 20th November 2012, 10:24 PM   #7
MarianB is offline MarianB  Romania
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Quote:
Originally Posted by Robert Kesh View Post
that will make a very very dirty AC, will need much filtering
Maybe so but it is an viable option, anyway until @Bradford336 gives us much more detailes than that sketchy short first message we cannot really help him.

@Bradford336 you need to be much more specific, what do you need that 15Vac for? where do you get those 30Vac from?
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Old 22nd November 2012, 09:48 AM   #8
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30vac from a center tap transformer powering a 15vac volume control board that will pull 1A
I keep hearing "just use a couple resistors" but have no idea how to size them. The transformer is powering a 15-0-15dc power supply for an amplifier circuit already. I am trying to add the volume control board to it. Sorry about the sketchy messages I just do not know what you need.
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Old 22nd November 2012, 10:56 AM   #9
Elvee is online now Elvee  Belgium
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Your VC board probably requires a floating AC input, if grounds have to be interconnected.
This leaves you only one option: a separate transformer.

If it doesn't need floating supply (unlikely), you can use one side of your 15-0-15 transformer.

For that kind of power, any other option is unreasonable.
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Old 22nd November 2012, 08:23 PM   #10
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ty everyone you guys always straighten me out
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