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20th November 2012, 12:48 AM
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#1 |
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diyAudio Member
Join Date: Oct 2012
Location: North Carolina
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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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20th November 2012, 01:32 AM
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#2 |
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diyAudio Member
Join Date: May 2004
Location: Melbourne
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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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Glenn. |
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20th November 2012, 04:30 PM
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#3 |
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diyAudio Member
Join Date: Sep 2006
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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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20th November 2012, 06:46 PM
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#4 |
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diyAudio Member
Join Date: Jul 2011
Location: Romania
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LM317 can regulate AC current, it's pdf has already a sugestion in the matter.
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Trance Session Live by Dj Marik |
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20th November 2012, 08:35 PM
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#5 | |
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diyAudio Member
Join Date: Oct 2012
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Quote:
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20th November 2012, 08:47 PM
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#6 |
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diyAudio Member
Join Date: Nov 2005
Location: San Antonio
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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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It is error only, and not truth, that shrinks from enquiry. - Thomas Paine |
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20th November 2012, 10:24 PM
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#7 | |
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diyAudio Member
Join Date: Jul 2011
Location: Romania
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Quote:
@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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Trance Session Live by Dj Marik |
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22nd November 2012, 09:48 AM
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#8 |
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diyAudio Member
Join Date: Oct 2012
Location: North Carolina
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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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22nd November 2012, 10:56 AM
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#9 |
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diyAudio Member
Join Date: Sep 2006
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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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22nd November 2012, 08:23 PM
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#10 |
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diyAudio Member
Join Date: Oct 2012
Location: North Carolina
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ty everyone you guys always straighten me out
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