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Class D Switching Power Amplifiers and Power D/A conversion

Ebay cheap TDA7498 boards
Ebay cheap TDA7498 boards
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Old 18th December 2014, 09:33 AM   #21
schdrag is offline schdrag  Switzerland
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Join Date: Nov 2014
now I have received the module:
tested it with a thinkpad notebook power supply (16V): very clear sound, i'm missing the bass (on 4 Ohm subwoofer + satellites). It seems to be a 2.1 mm/5mm socket, so the 2.5/5mm mm plug of the ibm power supply is a bit loose.
AutoTech, 14-39V according to the st-data sheet, but 39V not recommended, there is also another thread on the power supplies here. No hum with my thinkpad power supply, so a good notebook power supply should be ok.

Last edited by schdrag; 18th December 2014 at 09:38 AM.
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Old 19th December 2014, 02:45 AM   #22
Mobin is offline Mobin  United States
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I just ordered one thank you for the link
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Old 29th December 2014, 04:30 PM   #23
schdrag is offline schdrag  Switzerland
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In the meantime I have testet this cheap tda7498 module with two 4 Ohm speaker systems: Sony ss-sw1 (passive subwoofer + 2 satellites) and wigo A11 http://www.radiomuseum.org/r/wigo2_a...?language_id=2 (good old German speakers from the 70's, which sounds ok with my TEAC Hifi). The basses are totally missing, probably due to the output filter.
Not suitable to 4 Ohm speakers!

Last edited by schdrag; 29th December 2014 at 04:34 PM.
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Old 25th March 2015, 12:46 AM   #24
looweebee is offline looweebee  Philippines
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I bought these from Aliexpress Click the image to open in full size.
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Old 11th April 2015, 02:49 AM   #25
BennVenn is offline BennVenn
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Join Date: Aug 2014
Default Homemade eBay TDA7498 portable speakers from 12v

Hi guys,

I finished my PAM8610 portable speaker system and it is good enough for quiet listening but needed a little extra power for the shed, garden etc.

This is my build of my portable speaker system based on the eBay TDA7498 100w x 2 module.

Also included is a modified/homemade SMPS power for powering from 12v Li-Po's.

Take a look Here

Any questions, my email address is on the bottom of the page.

Thanks for looking!
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Old 13th April 2015, 08:53 PM   #26
Thor Ra is offline Thor Ra  Denmark
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Join Date: Nov 2012
Quote:
Originally Posted by Thor Ra View Post
I have one of these on the way too (paid $12.67 during the 11.11 sale on Aliexpress) along with this PSU which I got for $18.65 including shipping. Will be fun to see what such cheap parts can do with my Q Acoustics 2050i speakers.
Btw. the impedance of the speakers is rated 6Ω nominal (4Ω minimum). Does that call for any mods?
I finally got around to test the above amp + psu and thought I would share my initial listening impressions. Compared to the credit card sized Sure TPA3110 and this TPA3116 (unmodded) I have at home also it definitely packs a bigger punch. It's a clear winner in terms of bass and volume. Highs are not as great as my TPA3110/3116's though (at least not without mods), to my ears they are a bit grainier and sharp in comparison. I also have some static noise when the volume knob goes past 1/3. The noise strangely peaks at around 3/4 volume and then decreases a bit when I turn the volume all the way up. I should mention that I have a static noise problem with my TPA3116 amp also and the TDA7498 is actually not worse. Overall I'm quite impressed with what I got for about 30 bucks and I would actually be happy to fire my speakers up with this at a party. For relaxed listening at lower volumes my battery powered TPA3110 is still my preferred cheap class D amp though.
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Old 13th April 2015, 10:25 PM   #27
Buehgemeiste is offline Buehgemeiste
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Join Date: Oct 2013
last weekend we built two new cubo12 for our outdoor party machinery.
that board is a good and inexpensive amplifier for those.
we tried our setup with a smps and got similar noise.
when we hooked sla-batteries to the amp, all noise was gone and the punch was even better.
i'm still not 100% sure with the comparison between TDA749x and TPA311x.
i like both.
but i have to admit that i like the extra-spl that the 7498 provides for my woofers.
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Old 15th April 2015, 04:33 AM   #28
gychang is offline gychang  United States
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Join Date: Feb 2005
Location: Davis, California
Quote:
Originally Posted by Thor Ra View Post
I have at home also it definitely packs a bigger punch. It's a clear winner in terms of bass and volume. I also have some static noise when the volume knob goes past 1/3.
very helpful comment, I need little more power with my tda7297 in my bedroom but this is dead silent..., running with my 13V astron linear PS.

I am wondering whether the static will be noticeable about 5 ft away from my speakers (90dB)...
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Old 15th April 2015, 09:59 PM   #29
impuls60 is offline impuls60  Norway
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Look into the RC mod on the analogue power in mod for the tpa3116. Takes care of the hissing noise. It's well described in the tpa3116 thread.
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Old 23rd April 2015, 03:57 PM   #30
Kjeldsen is offline Kjeldsen  Denmark
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Join Date: Dec 2003
Location: Randers, Denmark
will output conductors likethese be better - it's a few bucks more than the cheapest TDA7498 boards.

Tda7498 digital amplifier board 80wx2 d amplifier board high power !-inAmplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

Click the image to open in full size.
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