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Class D Switching Power Amplifiers and Power D/A conversion

Toroidal transformers
Toroidal transformers
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Old 23rd February 2005, 08:47 PM   #1
muddy is offline muddy  United States
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Default Toroidal transformers

Hey Folks,

Im trying to Design a Car Amplifier, but I have ran into a problem with the power supply circuit. Seems that finding high Watt transformers which will handle a 20khz signal. in relatively small packages is impossible other than turning my own(dont want to do). Please help, or guide to another design concept. Anyone done a tranformerless high power supply for audio application?

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Old 24th February 2005, 08:23 PM   #2
subwo1 is offline subwo1  United States
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I did a project for a medium power one for a car amplifier by using a charge pump once.
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Old 25th February 2005, 12:02 AM   #3
hypnopete is offline hypnopete  Australia
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Hi Muddy,

I also have built a switchmode power supply for a car amplifier before. It was 400W at 12V, I wount the toroidal transformer myself.

Its supprisingly easy especially if you use a nice large toroid. I think winding one is your best bet, unless you want to pay someone else to wind it for you, however that will get expensive.

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Old 25th February 2005, 12:23 AM   #4
dmfraser is offline dmfraser  United States
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Default Transformer

In one of the articles in the Class-D section of the audio\circuits section of www.schematicsforfree.mattsoft.net there are instructions of how to wind a transformer.

Of do what others have done. Go to an amp repair shop and buy a blown up amo they junked. You will get all the hard to find bits you need out of it. After al, the transformers seldom go when the amps die. Just as long as the one you get does not have the transformer burned up, you're fine.
Dan Fraser
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