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Old 12th October 2007, 08:58 PM   #1
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Default car amplifier SMPS

Does anyone have any power supply schematics between +/- 20 and +/- 27 for a car amplifier?
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Old 13th October 2007, 05:13 AM   #2
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What's the total output power of the amplifier you're building?

Can you provide any other details?
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Old 13th October 2007, 06:31 AM   #3
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Im Doing the TDA8920B. I Believe its about 175wrms in BTL mode with an 8 ohm load.
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Old 13th October 2007, 04:28 PM   #4
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http://sound.westhost.com/project89.htm

Use this core:
F-140A-F

From CWS Bytemark:
http://www.cwsbytemark.com/prices/toroidal.php

Wind the core with a 1:2 ratio. Use 4+4 on the primary side and 8+8 on the secondary side. I'd suggest using two 14g for the primary and a single 14g for the secondary. If you want to use finer strands, use the equivalent amount of copper (~8000 circular mils on the primary and 4000 circular mils on the secondary). Go to the wire page of my car audio site if you want to use a different wire gauge and you don't understand 'circular mils'.

If someone knows of a regulated power supply schematic online, please post the link. It would be better to have regulation for this chip but the supply from the ESP site will work.
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Old 13th October 2007, 09:54 PM   #5
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ok. Thank you very very much! Im building this for my senior project in High School. Now i just need to learn how to make this transformer. Im sure my electronics teacher can show me how. Thanks again!! I'll be sure to post pics and stuff as im building

-Josh
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Old 14th October 2007, 09:31 AM   #6
luka is offline luka  Slovenia
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Hi

Have you searched this forum?!?! You got one for +/-30, which can be used for any voltages, I did my for +/-47v @ 300w @12v input

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Old 16th October 2007, 12:31 AM   #7
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Ok.... so i dont need a power supply for it anymore. We have a huge power supply at my skills center that can power it. Im only doing this to pass my Senior Project but afterwords i will construct a power supply so i can actually use it.

Ill start a new thread soon showing my construction steps incase anyone is curious
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