Ebay cheap TDA7498 boards

[Lo_Tse]

Thanks Lo is there a particular booster for the adapter I linked. I doubt I'd need one, but curious.

I ordered the one that JimBeam69 posted a link.

Regards

 

[afterlife2]

Thanks guys. Is there a thread on how the DC Voltage booster hooks up with my board. Sorry I'm a newbie.

 

[JimBeam69]

It's very simple:
-this Particular Booster already has a 2.1x5.5 mm DC Input Jack, so you can just plug your Power Adapter in there
-the output terminal(labeled "out") can be wired to this DC Plug DC Plug on aliexpress, which can be directly plugged into your board.

Theres one Blue Potentiometer(v-adj) to adjust the Voltage, you need a Multimeter to set it to the voltage you need. The Other Blue Potentiometer is to adjust the maximum Current, it should be set to max.

Here's a youtube review about this particular step up converter:
600W DC-DC Boost Converter Review and Play Around (This one's a keeper)

 

[afterlife2]

Thanks Jim for explaining. Hopefully is the 24 volts will be good enough. I won't play it too loud anyway. Arrrg get here already!

 

[sk971]

Hi Guys
I have a decent linear 16.5V supply and would like to get 30 watts mono into 8ohms for a small sub, would one of these tpa7298 boards be suitable or would it be under powered?
Thanks Simon

 

[JimBeam69]

To get 30W@8ohm you need at least 22v as supply voltage, otherwise it's physically impossible.
You will get about 15W max@16.5V.

 

[sk971]

Thanks Jim
Looks like I will need another power supply!

 

[irribeo]

Distorted datasheet values look close enough to 30 watt.

 

[JimBeam69]

Because it's clipping @10%thd.

 

[chienmort]

You need about 23Vdc for 30 watts relatively undistorted sound.

 

[jopereira]

One should not forget 10%THD is not music anymore : )...

 

[Buehgemeiste]

My experience with all three types of TDA7498 boards i have used is that they work great with anything from a 19v laptop brick up to a 36v smps (meanwell knockoff).
Two 12v sla batteries gave me the most satisfying results.
But i had a 19v laptop brick that wasn't able to drive the board.
Voltage broke down completely when poweing the amp up.
That might be because of the 4700uF chemicon kzn i put in front of the power input....i do not know, just a possibility.

 

[jopereira]

Yap, a good capacitor may impose a huge current that can lead to protection mode in (good) SMPS.

 

[easp]

That might be because of the 4700uF chemicon kzn i put in front of the power input....i do not know, just a possibility.

More than just a possibility...

 

[afterlife2]

Will this work guys or are the amps too low? https://www.amazon.com/SMAKN®-110V-...8&sr=1-1-catcorr&keywords=36+volt++ac+adapter

 

[Jerms]

Should be OK unless you use it full throttle or for heavy bass.

 

[easp]

Will this work guys or are the amps too low? https://www.amazon.com/SMAKN®-110V-...8&sr=1-1-catcorr&keywords=36+volt++ac+adapter

One of the reasons to choose a TDA7498 is that it can deliver ~50W/channel before distortion starts creeping up. To do that, it needs a ~36V supply, which that is. But that 36v supply needs to be able to deliver >100W, which the one you linked to makes no claims of being able to do.

So, yeah, the amps are too low.

 

[afterlife2]

So these are the 2 I'm looking at. Like I said I'm on a tight NY budget, so one of these will have to do. So which one will give me the most power, easp/jerms?
https://www.amazon.com/gp/product/B0150ZYHOO/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A2OCOGC9B25845
or
https://www.amazon.com/gp/product/B01H50J0NA/ref=ox_sc_act_title_6?ie=UTF8&psc=1&smid=ARVS18RS1K4U1
Jerms I already have a Dayton 1200 sub that I can use.

 

[easp]

Remind us about the speakers you plan to drive? Impedance?

 

[afterlife2]

Remind us about the speakers you plan to drive? Impedance?

Hi easp these are the speakers: 8 ohms
HVL-1 Bookshelf Two-Way Loudspeaker | Wave Crest Audio