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DAMGOO

ZK-502T Bluetooth Amplifier Board with Treble and Bass Control, TPA3116D2 50W x 2, DC:9-24V, Bluetooth 5.0 AMP Board for Home Passive Speakers

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Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, May 23
Order within 18 hours and 31 minutes
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Features

  • TPA3116D2 HIFI Chip Solution: Stereo Dual-channel Output to Ensure Continuous Serial High-power Operation, THD 0.1%. Wide Voltage Input DC: 9-24V;
  • Treble & Bass Control: If You Are Tired of The Inherent High& Low Bass, Why Not Try The High & Low Control Knob! This Will Make You Feel Like Being In A Movie Theater.;
  • BT and AUX Function: BT5.0 version, Transmission Distance Is Farther. The Transmission Distance Can Reach 49 Feet In An Open Environment. If your Play Device Does Not Have BT, You Can Also Input Audio Signals Through The 3.5MM Headphone Plug.;
  • Safety Protection: This Amp Board Has Overheat Protection, Circuit Protection, Over-voltage and Under-voltage Protection;
  • 7 * 24 Hours After-sales Service: Paying Attention To Customer Experience And Satisfying Customers Is Our Service Tenet. If You Have Any Questions About The Product, or The Product Has Quality Problems, Please Contact Us At Any Time, We Will Give You A 100% Satisfactory Answer.

Item Dimensions LxWxH: 4.33 x 2.76 x 0.83 inches


Voltage: 24 Volts


Manufacturer: DAMGOO


Mounting Type: Surface Mount


Brand: DAMGOO


Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 4.33 x 2.76 x 0.83 inches; 3.92 ounces


Item model number ‏ : ‎ ZK-TB21


Date First Available ‏ : ‎ May 7, 2020


Manufacturer ‏ : ‎ DAMGOO


Best Sellers Rank: #48,976 in Electronics (See Top 100 in Electronics) #198 in Audio Component Amplifiers


#198 in Audio Component Amplifiers:


Customer Reviews: 4.4 out of 5 stars 304


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, May 23

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Great sound quality with little power for little $$. Be sure to use good speakers. *also Replaced.
Review Image by Christophe Christophe
I have the DAMGOO ZK-502T and the ZK-1002 digital amps. They are both great running on a 16V laptop supply. Both provide plenty of volume. I have bought class-D for the TV and for the garage, and I got great results. I needed replacements due to a house fire. ** After a few weeks, mine failed. The BT "ready" signal continued to beep, interrupting music play on the wired input. BT has priority, and if it fails to connect, well, you are stuck with repeating beeps. Amazon Chat support quickly arranged for a warranty replacement with return of failed item. Replaced item works fine. ** The directions for these talk about what size of speakers they will support, and that small speakers require less power. This isn't right. The truth is that larger speakers are generally more efficient. In fact, if you have very large, efficient speakers, you can probably drive them straight out of your computer's sound card. I've done it. Your speakers will make all the difference; get good ones. If you go to a thrift store, only get a name brand like Sony, Aiwa, Yamaha, KLH, Pioneer. Never a lesser brand like Sharp or RCA. I have good quality 8 Ohm Yamaha speakers. Now I'll focus on the differences between these two that I think are most important. ZK-502T pro: bass and trebble controls! I like the flexibility. con: lame stick-on heat sink, probably should lay it flat. Better yet, mount with real thermal tape. ZK-1002 pro: larger screw-mounted heat sink, suitable for mounting in any position. Good, because mine is outside and exposed to the summer heat. pro: neat looking inductor coils, but I can't hear the difference. ZK-502T Current test with 2x 18650 cells (8 Volts) at 50% physical volume Average values: 50mA idle/quiet BT 100mA 50% vol BT 200mA 75% vol BT (with 1 Amp peaks) 600mA 80% vol BT (with 2 Amp peaks) 2500mA peak at 100% vol BT Recommended for long battery life: 2x 18650 cells with 2500mAh capacity, 12 to 24 hours runtime depending on volume. Better than some products off the shelf. Common A/C power supply recommendations: Minimum: 9V 1Amp Also suitable: 12V 3Amp, 16V 4Amp For 6dB greater distortion free volume: 19V 4.5 Amp The biggest difference between power supplies is that the audio is 6dB louder at most at 16V plus. The power regulator stays cool at 9V and begins to heat up at 16V. The main chip stays cool at 9V, and at 16V heat begins to build up as it is slowly dissipated through the board and components. I used a thermal camera to check this, and max temp I ever saw was a moderate 100 degrees F. Loud volume with a weak 9V supply can cause it to fail and restart. So only use a weak 9V supply if you plan on listening at moderate levels. With my 16V supply, there is sufficient current available for very loud music with no interruptions. Higher voltage is required for more volume, but results in more heat. At 16V, temps reach 115 degrees F. Semiconductors can take much more heat, and the main TPA311 chip has thermal protection. So these measurements are only for your information. The supplied stick-on heat sink didn't heat up much -- it is for show. Heat is also dissipated from the main chip through the board, however. I scraped off the black adhesive and used thermal tape instead -- with better results. I recommend you do this if you use a 24V supply. The reason I tested current usage was to confirm what I suspected -- that these amps are very efficient and require little power. I also wanted to know my battery life. I recommend 2 18650 cells. More than that will offer more volume, but will shorten battery life, as more power will be wasted in the power regulator. My AUX audio source is a Sony walkman mp3 player. Your source and/or a higher voltage power supply could get you more output power. But I believe it would never be close to 25 Watts, and this is something we should all be aware of. Bluetooth devices with Aux capability usually have better performance on BT. This amp is no exception. Idle power use is lower and audio is clearer at low levels. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - More testing with a 12V battery and a new setup. See photo of my weekend project: Li-Ion battery, solar power, handy carry handle. With the battery disconnected, and in direct sun, the panels power this at medium volume. With the battery connected it extends battery life. Estimated life of 20 hours. (No time limit while in direct sun.) Approximate current used: BT 22mA (OFF) idle 50 mA low volume 75 mA medium volume 200mA loud volume 600 mA Current peaks at 2A before distortion sets in. Any supply with at least 2 Amps and a minimum of 9V should be good for a quiet location, 16V if a bit more volume is desired for a loud location. (edited) Good luck and have fun! -Chris ... show more
Reviewed in the United States on February 21, 2021 by Christophe Christophe
    • Big Power, Little Package
Review Image by Brian Brian
Review Image by Brian Brian
Review Image by Brian Brian
Review Image by Brian Brian
This little Bluetooth audio amplifier packs a punch, and I was only using a 24W power supply (12V @ 2A). I tested it with two Dual Electronics LU43PB 3-Way component speakers with a nominal input impedance of 4-6 ohms (https://www.amazon.com/gp/product/B00081NX5U). I think high power component speakers are the best way to get the full range of audio control given to you by the treble and bass knobs. After turning the bass up to about 75% the sound quality was quite good and enough to rattle the room. The treble control is less impactful than a true equalizer evidenced by my still getting plenty of treble even after turning it all the way down. There is certainly enough control there for typical use cases, though. Connecting to Bluetooth is very easy. It broadcasts BT-WUZHI and is very responsive when pairing and connecting. It's almost too easy! Someone within range could connect to it very easily if you aren't already actively connected. I did test that another device can't hijack the connection by attempting to pair with it (some BT speakers will continue to broadcast and pair even when already connected). The device also does a good job at selecting either the 3.5mm jack input or the Bluetooth by always prioritizing the Bluetooth connection (the two inputs don't superimpose). I only have two minor complaints: 1) The Bluetooth radio can't be turned off. As long as the device is powered, the radio is broadcasting. I would prefer that the radio power down when I turn the power switch into its off detent. Since it's always on, it's easy to accidentally connect to it when you're in the vicinity. This could also be a problem if you are using the 3.5mm input and someone connects to Bluetooth since the device automatically prioritizes Bluetooth. I think it would be nice to have a separate switch to turn the Bluetooth on and off in addition to the master power turning everything off. 2) There are no additional mounting holes on the bottom and the included hardware is right around M2, so it's pretty small. Both of these issues are minor enough that they don't impact my rating. I simply unplug the device when I'm done with it just to avoid erroneous connections around the house and I can just add my own holes for mounting. In the end, this makes a great inexpensive Bluetooth amplifier that gives you more audio control and power than your typical Bluetooth speaker solutions. ... show more
Reviewed in the United States on June 23, 2020 by Brian Brian
    • Excellent Bluetooth amplifier for the price.
Sound quality was reasonably good. Pairing was simple and easy with my iPhone. Bass and treble controls are more than adequate to compensate for the speakers I will be connecting . Two minor drawbacks: First, there are no standard holes in the circuit board that would allow me to mount this internally to anything. The only holes are for the screws and standoffs for the upper and lower housing plates that it came with. Second, the only other drawback is that it makes a tone when you pair with it. At least I can control the volume of the tone, and it’s only one. I will probably use this amplifier again! Solid four stars across-the-board. ... show more
Reviewed in the United States on September 19, 2020 by MARK T WILLIAMS
    • Incredible device
I'm very pleased with this device. Very easy to assemble. I connected to a transformer I had from an old computer and I used two speakers from an old sound component. The result is more than I expected: sound quality, it connects right away to my computer or telephone and I'm enjoying this good purchase. ... show more
Reviewed in the United States on January 23, 2023 by Caramand
    • Nice basic amplifier with Bluetooth for the Money.
Nice basic amplifier with Bluetooth for the Money. I used it to power a pair if Pioneer speakers for my entertainment system in my camper. Has good sound quality with base and treble control but don't expect it to rival a full size amplifier. It is compact, has low power consumption and was easy to setup. and I can also stream audio from my phone or tablet to it using the Bluetooth connection which is a nice extra. Worked great for my application. ... show more
Reviewed in the United States on October 2, 2020 by RK
    • The best amp board I have bought!!
This replaced an older board with no bluetooth. I am very pleased with the performance of it.
Reviewed in the United States on December 1, 2023 by Bill

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