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Old 11th May 2011, 09:16 AM   #1
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Default 13 Volts AC in a car?

How can convert 12VDC to 13VAC?
Im integrating an amplifier into my dash and pretty much sealing the whole thing up so it cant be stolen
all you will see will be a volume knob, a couple RCA jacks (i may even hide those...) and maybe some VU meters if I can figure out this AC power thing...

ive got a VU driver board but it requires 13VAC
I thought about just installing a small inverter for 110vac and plugging the power supply into that but that would take up alot of room and just doesnt seem clean enough

anyone have any ideas?
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Old 11th May 2011, 09:21 AM   #2
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Do you have a schematic diagram for the board?
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Old 11th May 2011, 09:23 AM   #3
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i dont think so, i got it off of fleabay, let me see what I can dig up...
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Old 11th May 2011, 09:24 AM   #4
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no schematic but there are some very close up shots of the board

posting as links as the pics are pretty big

http://i121.photobucket.com/albums/o...2/4e6d2283.jpg
http://i121.photobucket.com/albums/o...2/8d1b1226.jpg
http://i121.photobucket.com/albums/o...2/458528f3.jpg
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Old 11th May 2011, 09:25 AM   #5
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and apparently its 18vac and not 13...
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Old 11th May 2011, 09:34 AM   #6
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AC18~24V according to the board.
What is the black component between the 2 green terminal blocks in the first picture? Can you give us a part number?
I'm thinking this thing has onboard rectification to DC. I'd bet the rent on it.
Is that a TO220 LM7812? If so, you can just tap in there with your car's DC.
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Old 11th May 2011, 09:38 AM   #7
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unfortunately i dont have the board with me, I will post some details on the black box when i get home from work in a couple hours
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Old 11th May 2011, 09:41 AM   #8
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OK. The good news is you don't need a voltage inverter. The bad news is you have to find where you can tap into the circuit and also verify you have a calibrated unit after you make the mod. Nothing to fret about though.
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Old 11th May 2011, 09:51 AM   #9
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If the AC is rectified into a single positive rail, you may be able to feed it DC. 18v of AC will give you about 25v of DC (which is what you'd want from what's shown on the datasheet for the IC). You could get 25v DC from rectifying the AC on the primary of one of the amp's power supplies.

If the power supply needs to be isolated from ground. You could get the power from the same source but you'd have to run it through a small transformer (which you could wind yourself).

It's likely to be a single-ended supply since there aren't two identical rail capacitors.
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Old 11th May 2011, 11:07 PM   #10
WSJ is offline WSJ  United States
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The TA7318P data sheet has a circuit with a single +25 V supply.

Toshiba TA7318P data sheet
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