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-   -   Help needed for battery power suply (http://www.diyaudio.com/forums/chip-amps/189596-help-needed-battery-power-suply.html)

Tunsan 24th May 2011 05:33 PM

Help needed for battery power suply
 
2 Attachment(s)
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:scratch:

wakibaki 24th May 2011 07:20 PM

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

Tunsan 24th May 2011 08:16 PM

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.

Tunsan 24th May 2011 08:44 PM

1 Attachment(s)
here is the photo

sofaspud 24th May 2011 09:00 PM

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.

Tunsan 24th May 2011 09:20 PM

Is it possible to only use one battery?

sofaspud 24th May 2011 10:10 PM

One 12V battery? Not likely.

Tunsan 24th May 2011 10:43 PM

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:)

sreten 25th May 2011 12:20 AM

Quote:

Originally Posted by Tunsan (Post 2582605)
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.

AndrewT 26th May 2011 11:38 AM

Ask your supplier to give you details of how to wire your PCB into your equipment.


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