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Old 21st August 2011, 04:45 PM   #1
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Default schematic supply from 12vdc to 24vdc

Hello

I search simple schematic of power supply to use with class T amplifier.

I need supply from 12vdc to 22Vdc-31Vdc with current of 10A in continuous.

My project is to build a power amplifier for my car.

The supply must have a remote control and i haven't find a schematic of power who have this


Do you think i can modify a push-pull supply from car audio to only have one dc output ?

If you have an idea to build it, please help me

Thanks
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Old 21st August 2011, 05:10 PM   #2
timwebb is offline timwebb  United States
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Location: memphis tn
i use this site when im building something.
Electronic Circuits - Free Electronic Circuits
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Old 21st August 2011, 07:24 PM   #3
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Nice website

thanks timwebb
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Old 21st August 2011, 08:40 PM   #4
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Location: Louisiana
You can use the same type of power supply that you've built in the past. Wind the transformer to a 1:1 ratio or just a bit higher (1-2 added turns to the secondary for an unregulated power supply). Leave the secondary center tap unconnected (or don't have a secondary center tap). Use the output of the negative rectifiers as the ground input to the T amp. Use the output of the positive rectifier as the positive rail for the T amp.
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Old 22nd August 2011, 04:52 PM   #5
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Hello Perry

Thanks, so i adjust the number of turn of wind at the secondary of the transformer and removed 3 turns to have 28.8Vdc at ouptut.

But now when i use the amplifier and measure the voltage at the ouput of the supply, i have 16.8vdc

It's really strange because when i use the supply in pushpull mode, the voltage don't change with amplifier connected at ouput.

have you an idea of the problem please ?

Thank in advance

Last edited by Ground Zero; 22nd August 2011 at 05:03 PM.
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Old 27th August 2011, 01:16 PM   #6
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Hello

I resolve the problem with new transformer

now i have the good voltage "21vdc" at output with the amp connected

Now i will test the class T amp in my car
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Old 27th August 2011, 04:26 PM   #7
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It's good

After one hour of burning test i can say is ok

The sound of the class T amp is really nice like a tube amp

the supply that i build is cold after one hour

This is a picture with a heatsink of a cheap amp, the amp is not complete but i finish it soon

Click the image to open in full size.
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