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Class D Switching Power Amplifiers and Power D/A conversion

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Old 24th June 2011, 07:05 AM   #1931
rubennn is offline rubennn  Denmark
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I am just charging my batteries one last time before the festival to be sure that they are full on juice. It seems that the bubbly noise I've been talking about kicks in already after 10 mins of charging.

But it was mentioned before that the bubbly noise could be the batteries emitting hydrogen and oxygen. I hope that's it then
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Old 24th June 2011, 07:12 AM   #1932
donnib is offline donnib  Denmark
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Join Date: Jun 2011
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Just a bit of an update if anyone is curios on my project:

- I have ordered my HP-10W from Germany, should be on their way. I ordered with PLUS - Elektronik Lautsprecher & Elektronik - Onlineshop, thx Wubbaz
- I have ordered my piezo's (MPT-001) from discoworld.dk and they are also on their way, actually they should arrive today.
- My amp6basic came couple of days ago, yesterday i finished it and tested it. Works like a charm.
- Ordered 2 x 10W Solarpanels from here KeryChip WEBSHOP - solceller, solcelleanlæg, tilbehør which i will but in parallel to get around 1.1A in perfect conditions.
- I already have 4 x Varta Lithium - Ion 6600mAh 14.8V 98Wh which should give me 26.4Ah
- I have ordered an Evaluation Module of Texas Instruments BQ24650 which will be used to charge the Lithium - Ion batteries.

What i still need

- Switches
- Voltage regulator to create 5V from 12V for iPhone or other peripherals that runs of 5V.
- Car plugs or some kind of 12V plug where you can plug other stuff that needs power.
- Case for the amp.
- Grills for the drivers
- Resistor for the piezos
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Old 24th June 2011, 07:30 AM   #1933
kblnig is offline kblnig  Denmark
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Join Date: Oct 2010
Quote:
Originally Posted by donnib View Post
Just a bit of an update if anyone is curios on my project:

- I have ordered my HP-10W from Germany, should be on their way. I ordered with PLUS - Elektronik Lautsprecher & Elektronik - Onlineshop, thx Wubbaz
- I have ordered my piezo's (MPT-001) from discoworld.dk and they are also on their way, actually they should arrive today.
- My amp6basic came couple of days ago, yesterday i finished it and tested it. Works like a charm.
- Ordered 2 x 10W Solarpanels from here KeryChip WEBSHOP - solceller, solcelleanlæg, tilbehør which i will but in parallel to get around 1.1A in perfect conditions.
- I already have 4 x Varta Lithium - Ion 6600mAh 14.8V 98Wh which should give me 26.4Ah
- I have ordered an Evaluation Module of Texas Instruments BQ24650 which will be used to charge the Lithium - Ion batteries.

What i still need

- Switches
- Voltage regulator to create 5V from 12V for iPhone or other peripherals that runs of 5V.
- Car plugs or some kind of 12V plug where you can plug other stuff that needs power.
- Case for the amp.
- Grills for the drivers
- Resistor for the piezos
perhaps you could get this one? $6.00 - 8S 5A Switch-Mode Ultimate BEC (UBEC) - R/C Helicopters - it is a switch mode and somewhat cheap
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Old 24th June 2011, 07:47 AM   #1934
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My amp6basic is not working properly as one channel is faultering but it turns out that it's the bad chip problem announced on 41hz. Have been trying to get in touch with Jan to get a replacement chip for over 2 weeks now, still no feedback what so ever concerning my matter. Anyone know this guy? Getting a bit frustrated as I'd like to finish the boombox...
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Old 24th June 2011, 08:34 AM   #1935
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Quote:
Originally Posted by daholygoat View Post
My amp6basic is not working properly as one channel is faultering but it turns out that it's the bad chip problem announced on 41hz. Have been trying to get in touch with Jan to get a replacement chip for over 2 weeks now, still no feedback what so ever concerning my matter. Anyone know this guy? Getting a bit frustrated as I'd like to finish the boombox...
How soon do you need a new TA2020? I have one that's never been used and guarenteed not of the faulty batch (it's one of the originals from Korea, not the newer ones from China).

Otherwise try to contact V-bro either here or on the 41hz forum (which is down at the moment as they update the website this weekend), he has good contact with Jan.
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Old 24th June 2011, 08:42 AM   #1936
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Quote:
Originally Posted by donnib View Post
Just a bit of an update if anyone is curios on my project ...
Yes please, do keep us posted.
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Old 24th June 2011, 09:09 AM   #1937
donnib is offline donnib  Denmark
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Join Date: Jun 2011
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Quote:
Originally Posted by kblnig View Post
perhaps you could get this one? $6.00 - 8S 5A Switch-Mode Ultimate BEC (UBEC) - R/C Helicopters - it is a switch mode and somewhat cheap
thanks, that does sound interesting. Have you tried one ?

They seem to use something like this one http://www.national.com/mpf/LM/LM2596.html#Overview which is something similar to what i was considering to buy.

Last edited by donnib; 24th June 2011 at 09:12 AM.
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Old 24th June 2011, 09:15 AM   #1938
chief3 is offline chief3  Denmark
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Join Date: Apr 2011
hi guys im going to assemble it all today. and i have a few questions left
what kind of glue should use when glueing the magnets and should i remove the sticker ?
and should put something inbetween ?

i have bought the recommended bubble horn tweeter from ebay
HORN BUBBLE TWEETERS 3.5" 10 PACK PIEZO PA DJ (NTX3711) | eBay

what kind of ohm resistor should i use ? 100 or 150 ?

thanks in advance
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Old 24th June 2011, 09:54 AM   #1939
rubennn is offline rubennn  Denmark
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Join Date: Jun 2010
Location: Copenhagen
Remove sticker, clean the magnet surface with some alcohol, glue magnets together with strong two component glue, if there's space somewhere between cabinet walls and the driver then mount a masonite board (with the speaker hole cutout) to fit or anything else with the thickness needed.

Resistor is 33 ohm I think. That's at least what I think Phaedras uses his with and he says it sounds fine.

Correct me if wrong.
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Old 24th June 2011, 09:58 AM   #1940
chief3 is offline chief3  Denmark
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hmm im quite confused what resistor to use now, saturnus recommends 150 ohm ones and phadres 33 ones. thanks for the glue answer though

anyone who has experience with the piezos im using and in so fall what resistor to use ???

im going to roskilde tomorrow O.o and its still not assembled
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