Author Topic: 38W x 2 stereo amplifiers  (Read 11029 times)

Offline PsyCLown

Re: 38W x 2 stereo amplifiers
« Reply #15 on: March 27, 2017, 12:48:49 PM »
I don't have one yet...  :P

When it comes to cooling, an old CPU cooler might work, but I'm not sure if it'll dissipate fast enough.  Might want to drill a hole through it to secure the chip with a bolt though, I wouldn't stick it to the sink with epoxy or something like that.  That's asking for trouble...  :P
What do you plan on using yours for?

Hmm, drilling holes sounds like a bit of a mission but makes sense.
Amps: 4x 150W into 8ohm (LJM L15D)
DSP: MiniDSP NanoAVR HDA & UMIK
Speakers:DIY Full Range Phillips AD12202 & Speakerplan's X15 on loan
Sub: DIY 12" ported & Peerless 10" Sealed on loan
Headphones: Beyerdynamic DT770 LE

Offline Toxxyc

Re: 38W x 2 stereo amplifiers
« Reply #16 on: March 27, 2017, 01:22:26 PM »
I was thinking about getting one just for the fun of it.  I want some cheap amps to play with, and these ones seem to have the oomph I want.

Also, you'd be surprised by the quality some of these cheap amps can produce...  :P

Offline LAV

Re: 38W x 2 stereo amplifiers
« Reply #17 on: April 05, 2017, 02:46:00 PM »
What do you plan on using yours for?

Hmm, drilling holes sounds like a bit of a mission but makes sense.

That chip is made to be fixed to a heatsink using a proper bolt and nut.
Vaal Triangle (Southern Gauteng)

Offline Noizyboy

Re: 38W x 2 stereo amplifiers
« Reply #18 on: April 07, 2017, 02:16:25 PM »
or get something with Bluetooth on board as well, and save the hassle of importing yourself

 http://www.diyelectronics.co.za/store/audio/1442-tda7492p-25w25w-wireless-bluetooth-csr-40-audio-receiver-digital-amplifier-board.html

Offline Toxxyc

Re: 38W x 2 stereo amplifiers
« Reply #19 on: April 10, 2017, 02:06:00 PM »
That's quite nice!  Store reputable?

Offline Timber_MG

Re: 38W x 2 stereo amplifiers
« Reply #20 on: April 10, 2017, 02:41:17 PM »
You kidding right?

Offline Toxxyc

Re: 38W x 2 stereo amplifiers
« Reply #21 on: April 10, 2017, 03:44:41 PM »
Not at all.  Never heard of them mostly because I don't move in the relevant circles, but by your reaction I take it they're nice and deserve my money :P

Offline Timber_MG

Re: 38W x 2 stereo amplifiers
« Reply #22 on: April 10, 2017, 04:43:46 PM »
Absolutely, Noizeyboy on this forum. Taking a look at the 3D printer parts side of the site, many good products.

Offline BobsYourUncle

Re: 38W x 2 stereo amplifiers
« Reply #23 on: April 10, 2017, 05:15:28 PM »
That's quite nice!  Store reputable?

I bought one , it arrived at my door 1 business day later.
Kempton Park, Estrand,GP

Offline juventino

Re: 38W x 2 stereo amplifiers
« Reply #24 on: April 11, 2017, 04:54:10 PM »
I bought one , it arrived at my door 1 business day later.

Have you tried it out yet?
Whats the Bluetooth range like?

This would be brilliant for a Lapa area where people can connect via Bluetooth and play music from their Cellphones.
Time to get back to when I enjoyed listening......no more upgrading, more of a headache than a pleasure

Offline BobsYourUncle

Re: 38W x 2 stereo amplifiers
« Reply #25 on: April 11, 2017, 05:28:14 PM »
Have you tried it out yet?
Whats the Bluetooth range like?

This would be brilliant for a Lapa area where people can connect via Bluetooth and play music from their Cellphones.

Bluetooth range isn't great but would do well within a Lapa environment(just a few steps outside the room where the device was started cutting the transmission through a double wall). What surprised me though is that it did pretty well and reached a reasonable volume powering a pair of Tannoy mx1's I have. It wont do drunken loudness requirements but does play comfortably louder than background listening without distorting or getting hot.
I did get popping and distortion when running it off a power supply that I set to 15v but a car battery proved the best results.
I have had worse sound quality from devices costing more. For what I paid, I really cant complain.
The range on my Harman Kardon HK3770 is better but the HK3770 did cost 12 times more on a 50% off sale.
Kempton Park, Estrand,GP

Offline Hi-Phibian

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Re: 38W x 2 stereo amplifiers
« Reply #26 on: April 11, 2017, 05:34:04 PM »
Car battery is lower than its max volt input so max volume as per spec wouldn't be achieved. 







[Anyone who thinks that wealth is measured in money is blind and narrow minded.  Wealth is obviously measured in turntables and records.]
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Offline Toxxyc

Re: 38W x 2 stereo amplifiers
« Reply #27 on: April 12, 2017, 06:53:40 AM »
Well according to the chip's datasheet the undervoltage kicks in at 7V and it operates fine from 8V~26V.  Quite frigging awesome.  This will run well on an old laptop PSU, or if you have a few old computer power supplies you can hook up two of them and build a 24V PSU.

Offline Noizyboy

Re: 38W x 2 stereo amplifiers
« Reply #28 on: April 12, 2017, 10:36:54 AM »

Offline Toxxyc

Re: 38W x 2 stereo amplifiers
« Reply #29 on: April 26, 2017, 02:27:24 PM »
I ended up buying this:  https://www.banggood.com/4-in-1-TDA7492P-50W50W-Bluetooth-CSR4_0-Amplifier-Acrylic-Shell-Interface-Plug-Heatsink-Kit-p-1125209.html

Now I know this kit probably won't produce 50W per channel since the chip itself is only capable of 25W @ 10% THD and 20W @ 1% THD but it's still not bad at all, considering it has a MASSIVE input voltage range (anything between 7VDC and 29VDC makes this thing tick) and it comes complete with mounting case, Bluetooth 4.0 capability, sinks and a "mounting kit".

I had some discount on there so I paid R242.41 for the kit with insured and tracked shipping.  Looking forward to it arriving!