Help needed for battery power suply

Tunsan · 24th May 2011, 04:33 PM

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

wakibaki · 24th May 2011, 06:20 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, 07:16 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, 07:44 PM

here is the photo

sofaspud · 24th May 2011, 08:00 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, 08:20 PM

Is it possible to only use one battery?

sofaspud · 24th May 2011, 09:10 PM

One 12V battery? Not likely.

Tunsan · 24th May 2011, 09:43 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 · 24th May 2011, 11:20 PM

Quote:

Originally Posted by Tunsan

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, 10:38 AM

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

24th May 2011, 08:00 PM	#5
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio	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. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

24th May 2011, 09:10 PM	#7
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio	One 12V battery? Not likely. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

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24th May 2011, 06:20 PM	#2
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	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

24th May 2011, 07:16 PM	#3
Tunsan diyAudio Member Join Date: May 2011	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.

24th May 2011, 08:20 PM	#6
Tunsan diyAudio Member Join Date: May 2011	Is it possible to only use one battery?

24th May 2011, 09:43 PM	#8
Tunsan diyAudio Member Join Date: May 2011	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

26th May 2011, 10:38 AM	#10
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Ask your supplier to give you details of how to wire your PCB into your equipment.