DROK TDA7297 15W+15W Audio Power Amplifier Module AC/DC 9-18V 2.0 Dual Channel Stereo Amp Board, DIY Sound System Component

I bought this unit as a station amplifier for my amateur radio (ham) station. It works very well and has lots of power to drive my little 3-inch cube speakers. Hookup was easy. Nice knob, standard connector, bright blue LED for "Power On", and the board has convenient mounting holes should you want to put it in a little enclosure.For non-techies, be sure that you read the clearly-marked silk screening on the board that tells you which lines go where! It's easy though: you just need a little screwdriver to attach the leads to power and your speakers.The heat sink is huge and will safely support the audio chip used without letting it get overheated. Overall, this is a 10/10 unit for the price and for my specific application in amateur radio. I'm an extremely happy customer.

Very good product. I am amazed how well this thing sounds. Plug it to a pair of large 10W-90W 8Ohm speakers and very happy with the results. It has a standard input jack, two output channels and input power. Of course all the work is done by the TDA7297.The board asks for 12V AC/DC but this IC allows 6.5V to 18V (with an absolute maximum rating of 20V and 2Amps). Actually I measured current consumption and at a reasonable volume (enough to fill a large room) it draws around .3 A on average and the heatsink barely gets warm.Also, the datasheet recommends a 470uF filter capacitor but the board has a large 2200uF capacitor (Chongx brand 105C). It also has a silicon diode so I suppose it is used as a half wave rectifier when you use AC, which I don't see the point anyway. In any case, I think I will put a spare Rubycon cap I have around and see if I notice any difference. Overall, very happy with this little amp.

Ordered two of these; one needed a terminal block re-soldered, not a difficult operation.Needs a ~12 volt DC power supply of at least 2 amps** for full output, and is otherwise self-contained (ready to use). Battery/wall wart/psu all work fine as a power source.Mine have some hum BUT I also haven't grounded them properly yet. The ground connector is a very small hole, next to the printed model number by the volume knob--solder your ground wire there. The other GND marking refers to the DC-in negative (-) wire.Not hi-fi, but for the money it's great and could be used in many applications. I've had fun with it.** e.g. Gino-branded 12V 2A DC Universal Regulated Switching Power Supply

For the price this is probably a pretty good audio amp for project work. However the one I received did not have a working left channel output. I was able to debug it. When they went to insert the potentiometer into the PCB, during manufacturing, one of the pins missed the through hole and got folded up on top of the board. Would seem like if they were doing even the most basic production testing of these this would have showed up. Attached photo shows pin bent up on top of PCB

Works perfectly. Excellent little amp and a great price. I am using it for a MAME arcade setup to a mono speaker, powered off of an unused 4 pin MOLEX connector's 12v and ground. A little feedback at high volumes, but the speaker I have it connected to isn't the best. The unit isn't even getting hot at the heatsink, which is nice.Seller is very good and had clear communication and was very accommodating.[UPDATE]: 5/18/16: I have now been using this for a few months on a set of passive 8 Ohm speakers typically found in a car stereo setup. I have a stereo cable plugged into the jack. The +12VDC power is coming from a spliced 4 pin Molex wire from my computer's power supply. This thing works wonderfully and still doesn't heat up. No problems at all so far!

My application was for an ultrasonic (20kHz-40kHz) piezo driver. That frequency range eliminates all those now popular class D amp modules available. So I had to go retrograde and find some class AB modules which generally exceed 20kHz without much power loss. The unfiltered TDA7297 chip will do 40Hz to 100kHz @ -1dB with acceptable distortion. Unfortunately I ordered three units and two were DOA (no signal at all) and one only reproduced the positive going signal (sine wave) while running extremely hot. All tested with an 8 Ohm load and 12.5Vdc power supply. Otherwise nice layout and simple hookup.