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Class D Switching Power Amplifiers and Power D/A conversion

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Old 23rd August 2012, 02:16 PM   #3161
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Now have i tried with the amp you suggested saturnus, and the vibrating sound is gone, but now the sound isn't loud enough.

You suggested this amp: MKll TA2024 Fully Finished Tested PCB Power Amplifier Board 2x15W | eBay

do you know a more powerfull amp?
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Old 23rd August 2012, 02:16 PM   #3162
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Quote:
Originally Posted by Saturnus View Post
No. It's internally limited to prevent shorts and overcurrent.
Hmm i just ordered a fuse and fuse holder. Oh well, better safe than sorry

I also just ordered the 9800mAh Li-ion and the TA2024 MKII

I am going to build it out of 14mm oukume marine ply, as i have a sheet lying around. But i was thinking of routing out some circles on the inside, in order to keep the weight down a bit. Here's the drawing Jacks qubinator by Jack - 3D Warehouse
Without any type of acoustics or engineering degree, I am guessing that this will also be a stronger construction, and the routings may improve acoustic damping in the cabinet? Or am i a complete idiot?

By the way, should i just use epoxy to glue the drivers to the wooden block in the center?
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Old 23rd August 2012, 08:41 PM   #3163
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Originally Posted by Kasper Jack View Post
Does anyone know of good places to get speaker wadding in Denmark?
If you live in Copenhagen then visit STOF2000. I have earlier bought some synthetic wadding from there. It's also very cheap - like 20 DKK per 100 grams or something.
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Old 24th August 2012, 04:58 AM   #3164
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Quote:
Originally Posted by Kasper Jack View Post
By the way, should i just use epoxy to glue the drivers to the wooden block in the center?
I worry that epoxy would eventually crack and rattle. However, Liquid Nail (waterproof original/outdoor formula) remains slightly elastic for 17 years, but it is much firmer than other siliconized glues.
This is a guess.
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Old 24th August 2012, 05:45 AM   #3165
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Quote:
Originally Posted by booom View Post
Now have i tried with the amp you suggested saturnus, and the vibrating sound is gone, but now the sound isn't loud enough.
You suggested this amp: MKll TA2024 Fully Finished Tested PCB Power Amplifier Board 2x15W | eBay
do you know a more powerfull amp?
Yes! TA2021, (Muse) has a wider voltage range and higher voltage means more power for halfinator and Qubinator.

If using digiplayer source like mp3, iphone, etc. . . be prepared to modify gain settings or else buy a preamp. Like almost every audio amplifier, the gain in stock condition is set for super loud 80's era CD players, not weaker modern sources. And, bigger voltage in your power amp does not make your iphone more powerful.

Inside the Muse I25w. . . are some trimmers and full size resistors. I do not know what the trimmers do Gain? offset?
Click the image to open in full size.
However, there are full size resistors that are easy to replace to set your gain, UP LOUDER just by replacing two of those resistors.

P.S.
The speaker does not play down to 20hz. To conserve amplifier power (so that you can play louder), you can replace the input caps (they're easily found directly in line with the potentiometer) to a smaller capacitance figure so that the amp will do only as much bass as the speaker needs instead of trying to push super low pitches that the speaker wouldn't output anyway.
You can also add output caps, simply a large capacitor(s) series to the speaker and choose this size to roll off pitches the speaker wouldn't output--Conveniently, that little trick also puts the offset to zero.
With both filters set to eliminate wasted power (remove pitches from 0hz through 44hz), the amplifier will have more power to spare.
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Last edited by danielwritesbac; 24th August 2012 at 05:53 AM.
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Old 24th August 2012, 06:23 AM   #3166
rubennn is offline rubennn  Denmark
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I was actually wondering - if a speaker with a paper cone gets wet, is it then possible for the cone to dissolve when set into motion by a music signal at high volume?

I'm thinking mostly of a PA speaker like the HP-10W. The outer ring of the cone seems to be laminated with something - waterproof maybe? I guess PA speakers are made to be able to handle variations of misuse. I just never dared to pour water over a speaker before and turn the volume all the way up and ignore it.
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Old 24th August 2012, 06:56 AM   #3167
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The HP-10W is weatherproof (not waterproof) as it has a coating on the membrane from the factory. Please note, that this is one of the changes that happened to the HP-10Ws design about 3 years ago
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Old 25th August 2012, 09:56 PM   #3168
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Hi,
What cables should I use from my battery to the amp?
Can't find a pre-assembled cable??
My amp is a MUSE M20 EX2 TA2020 T-Amp Stereo Amplifier 20Wx2|eBay

- Hanne
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Old 25th August 2012, 10:09 PM   #3169
Pano is online now Pano  United States
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Quote:
Originally Posted by danielwritesbac View Post
I do not know what the trimmers do Gain? offset?
Almost certainly DC offset. The DC offset trimmers are tied to the input resistors and usually located close to them, as in your photo.
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Old 26th August 2012, 06:53 PM   #3170
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Originally Posted by Kasper Jack View Post

I also just ordered the 9800mAh Li-ion and the TA2024 MKII
Been thinking of getting one of those batteries for a while, but nobody's come back to me WRT whether they're actually any good.

I'll be interested to hear your experience with them.

Cheers
Chris
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