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Old 24th May 2011, 04:33 PM   #1
Tunsan is offline Tunsan  Denmark
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Default Help needed for battery power suply

I need help for my new amp. It is a TDA8920 CLASS D Audio Power Amplifier AMP Kit 100W X2 se pic.

Im most confused about the powersuply as im using 12v batterys to power it and I don't really know how to connect the power to the amp.... It says ac2x20v(se attachment).... How do i connect it when im using 12 v batterys????
sorry for being a newb
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Old 24th May 2011, 06:20 PM   #2
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This amplifier was intended to use AC.

It should be possible to use DC, and even connect it to the AC inlet, but it would be better to have a view of the schematic before giving advice. If you have one, post a scan or picture of it.

It will not achieve the full output with 2 * 12V.

w
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Old 24th May 2011, 07:16 PM   #3
Tunsan is offline Tunsan  Denmark
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I dont have any schematics, so just some help would be great

I herd that i could make circuite with two batteries like the photo below.

I tryed it but it did not work.... The only sound was some low konstant clicking.

i dont think i need the full power for my project.
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Old 24th May 2011, 07:44 PM   #4
Tunsan is offline Tunsan  Denmark
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here is the photo
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Old 24th May 2011, 08:00 PM   #5
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Connect your batteries at the electrolytic capacitors. In the bottom-side pic, neg-pos-neg-pos from left to right. I see in the TDA8920 datasheet "Operating voltage from 12.5 to 30 V" so I wouldn't expect a lot of portability without a frequent battery charge.
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Old 24th May 2011, 08:20 PM   #6
Tunsan is offline Tunsan  Denmark
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Is it possible to only use one battery?
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Old 24th May 2011, 09:10 PM   #7
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One 12V battery? Not likely.
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Old 24th May 2011, 09:43 PM   #8
Tunsan is offline Tunsan  Denmark
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Ok to get it straight:

i can just mount the two batteries directly on the soldering on the backside of the capacitators: one battery neg-pos and the other neg-pos one on etch capacitator?

Should i then unmount the bridge rectifier? or should i leave it.

bu the way thanks for the help, i really need it
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Old 24th May 2011, 11:20 PM   #9
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Tunsan View Post
Ok to get it straight:

i can just mount the two batteries directly on the soldering on the backside of the capacitators: one battery neg-pos and the other neg-pos one on each capacitor?

Should i then unmount the bridge rectifier? or should i leave it.

bu the way thanks for the help, i really need it

Hi,

What you state is essentially correct. You can leave the bridge in place.
Going directly to the caps avoids the ~ 1.5V drop added by the bridge.
Even so, given spec is +/- 12.5V it might not work, but it likely will.

rgds, sreten.
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Old 26th May 2011, 10:38 AM   #10
AndrewT is offline AndrewT  Scotland
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Ask your supplier to give you details of how to wire your PCB into your equipment.
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