2x15W Class-D Stereo Power Amp Kit TPA3122

Brand:| Model: AA-AK32151
Product Video
The easy-to-assemble stereo audio amplifier kit's Class-D design provides pristine, accurate audio reproduction combined with an authoritative bass punch, while requiring lower input current than conventional Class-AB amplifiers.
  • Easily assembled dual channel Class-D amplifier
  • Outstanding fidelity and efficiency
  • Heat sink not required for most applications
  • Switch-adjustable input sensitivity
  • Just add a power supply!
Part # 
Weight: 0.25 lbs.  
List Price$29.99
You Save33%
Your Price
Buy 4-up$18.30
Part # 320-322
Qty:  EA
Available Payment Methods

Product Details

2x15W Class-D Stereo Power Amp Kit TPA3122

This Class-D stereo audio amplifier kit incorporates the TPA3122D2 power amplifier IC. Class-D designs provide pristine, accurate audio reproduction combined with an authoritative bass punch, while requiring lower input current than conventional Class-AB amplifiers. Completion of this easy-to-assemble kit will result in a fully functional, dual-channel audio amplifier.

The TPA3122 amp IC is capable of producing up to 15 watts per channel (8 ohms @ 28 VDC input power), and the device's efficiency eliminates the need for an external heat sink when playing music. The complete amplifier can be powered by a wide range of 10 VDC to 30 VDC supplies. Included switch can be used to set the gain as 20 dB, 26 dB, 32 dB, or 36 dB. This kit contains through-hole components exclusively, which solder easily into the pre-drilled printed circuit board. Power supply not included. Dimensions: 121.90 L × 91.40 W × 1.60 H (±0.20) mm.

Note: Please match the components listed in the Users Manual (found in the Manual/Resources section on the right hand side) to the Item Number on the printed circuit board. 

Product Specifications
  • Project Kit TypeUnassembled Amplifiers
2x15W Class-D Stereo Power Amp Kit TPA3122
  • BrandParts Express
  • ModelAA-AK32151
  • Part Number320-322
  • UPC844632091575
  • Product CategoryElectronic Project Kits
  • Unit of MeasureEA
  • Product Rating
    (10 Reviews)
  • Weight0.25 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Similar Products

View similar products to the 2x15W Class-D Stereo Power Amp Kit TPA3122
in the Electronic Project Kits product category.


2x15W Class-D Stereo Power Amp Kit TPA3122
2x15W Class-D Stereo Power Amp Kit TPA3122 is rated 4.3 out of 5 by 10.
Rated 5 out of 5 by from Stereo 15W Class D amplifier kitKit was well organized. No instructions, but very easy to assemble!Sounds FANTASTIC on small Advent speakers!
Date published: 2014-06-20
Rated 3 out of 5 by from Good Little Project, I had to supply my own chip sThis little amp project went together easily enough. The only regret I have is that the 20-pin socket supplied with the project had lost one of the pins and others were working their way loose.Fortunately, I had some 20-pin sockets so I was able to proceed with the assembly.The amp works well and I am ordering a pre-amp kit to go with it.Then it's off to build a pair of little speakers for the set and I should have a cool little stereo for my boat this summer.Check over your parts when the kit arrives.
Date published: 2014-04-23
Rated 5 out of 5 by from Amazing sound, for such a price!I bought this for a study of class D amps, and this only proved the point more that class D are excellent amps, the small amount of current is amazing!
Date published: 2014-03-13
Rated 5 out of 5 by from Class D amp kitReally amazing performance for a simple circuit. I'm feeding mine with a mixer to control it and it sounds great. How do they get that chip to put out so much power and not even get warm?
Date published: 2013-03-12
Rated 5 out of 5 by from Amp kitA great amp kit to construct.. all parts were included, all I needed was a case to put it in. Testing and operation werealmost imediate after construction..I used the 12V 2A adapter, but one could use a 3A for higherpower output, without distortion.
Date published: 2012-11-25
Rated 5 out of 5 by from A surprising little amp kit......with only one bad surprise and a whole bunch of good ones.The only bad part is that this is not as easy to assemble as it might be, even for an expert builder like myself. Learn from my mistakes:Use a Helping Hands to hold the board during assembly. Use a short 30W soldering iron--particularly short if your hands shake.Mount and solder the resistors first--the holes are tiny and if you foul one with solder you have a BIG problem.Mount and solder the other components in regions, as follows:1. The IC socket and all of the small 1 uF caps--solder the caps first, clip leads, then do the socket.2. The large electrolytic capacitors--the positive lead is longer; the negative leads face the margin of the board.Before soldering, mount also the .68 uF cap at the end of each row of electrolytics. Solder and clip leads.3. The power connector and the RCA jacks.4. The remaining .68 uF caps and the filter coils--mount each coil with the long (top) lead facing the margin of the board.5. The green LED (the longer lead is positive) and the power diode (observe polarity). Then insert the chip (observe polarity) carefully, and you are done.6. I recommend adding Phoenix connectors for the speaker outputs and the power connection. These are sold at Radio Shack. These are of course optional. (You can also add these for the inputs, the muting circuit, the standby circuit and power feed through it you like.) Easiest way to mount is to use a clip to hold the connector in place, then solder.I kludged my first build, but it worked, but is marginally stable on power up (takes a couple tries to get it on). The second build is perfect, and worked from the get go.Now the review:This board compares well with the unfortunately discontinued TPA3123D2 board--only slightly less usable output and a bit more noise at high gain settings--still acceptable, though. More than enough power to drive a pair of Dayton B652s with ribbon tweeters to large room filling volume. Also, as noted in another review, a single ended class D design that can drive headphones, though I believe a class AB design would be better for high impedance (>32 Ohm) phones. Like its big brother, the 3122D2 will handle supply voltages up to 30 VDC, though the chip may get a tad hot if driven hard at this voltage (a simple home made press on heat sink might be in order for longevity). Sound quality, as with other TI chips, is very good to excellent, only a tiny bit less transparent than the lower powered Tripath boards, and comparable to the larger Tripath designs (TK2050). I A-B'ed this with a current model TK2050 board from Parts Express--lower noise on the Tripath, but sound quality about identical.For $20 and an hour of build time, this little board is a screaming bargain. Very flexible with different power supplies--I think a used laptop supply (I am as I write this using a used Dell 20VDC supply with excellent results), but 12V supply also works, as does one of the Meanwell 24VDC supplies used for the larger Tripath boards--the 145W version would drive several of these kit boards, and the 350W version would power a whole slew.
Date published: 2012-09-11

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
2x15W Class-D Stereo Power Amp Kit TPA3122

How to bridge?

The datasheet states this IC is BTL capable. The schematic omits the 470uF capacitor on the output filter, and the right and left inputs becomes plus and minus.So, to connect in BTL mode:- Do not solder the 470uF capacitor;- RCA signal positive to plus input, GND to minus;- Speaker is connected between both channels positive terminal;- Adjust output filters as needed, per datasheet specs.Is this correct?Thanks!
Asked by: Raphael
I have not reviewed the manual/data sheet. I strongly suggest that you contact Parts Express Technical Department before you attempt to do this. I am confident that if damage results there would not be a warranty.
Answered by: Nitnub
Date published: 2013-06-27

should a anti pop circuit be added and if so what design is available?

Asked by: jackson1520
I don't think a low power, high efficiency amp would require surge or pop protection when used with full range speakers or proper crossover.
Answered by: Nitnub
Date published: 2013-04-06

Can this amp be bridged to mono?

I am thinking you can bridge from the R+ to L- and get mono output. Will this have any ill effect?
Asked by: slamgauge
Bridged, to me is a term to describe combining both channels to get double power output in mono mode. From your question it sounds like you want to run mono inputs so that the same source is in each channel.If you wish to bridge outputs for more power, the answer is yes, but the cost to do this properly without risk would be more than buying a 30 watt stereo amp. It involves modification of the transistor rails, added sinks, impedence matching, and a transformer for phasing.Amps that can be bridged have that capability designedin as a feature. Some only require a switch and using the R + L + speaker terminals.
Answered by: Nitnub
Date published: 2013-02-05

Please suggest project box, binding posts, and power supply.

I'm unfamiliar with power amps but I can solder ok. I don't understand how this fits into a project box with all the inputs and outputs, or how the binding posts attach to the board and then are accessed through the box or if wires go between and the posts are mounted to the box. Budget is flexible. I want it to be solid.
Asked by: Wayne2
Unless you really like working in tight spaces, I recommend a 5 x 7 x 2 inch (roughly) project box. The easiest way to handle input is to run an audio cable into the box to connect to the RCA inputs. I have also soldered Phoenix type connectors to the board (available from Radio Shack as PC Board Connectors (they've never heard of Phoenix) for both inputs, both outputs, and power, since this makes connecting all these things much easier. However, you can solder directly to the board, which is plated through (so no waveguide soldering needed). on all holes. As for output connectors, you can mound individual 5 way connectors right to the board without soldering. To be a bit more professional, the dual 5 way binding posts sold by PE are very nice and easy to mount and connect. However, pinch type connectors work well, too, as do screw type terminal switches; it all depends on how fancy you want to get. I do recomment putting a volume control on the input; any 50-100K Ohm stereo log (audio taper) pot will do, and won't affect the sound (OK, I hear the howls of the ALPS aficionados, BUT my reasonably golden but aged ears hear little or no difference). It sounds like external RCA jack connectors and dual 5 way binding posts will be what you will want.
Answered by: Doc Jones
Date published: 2013-01-06

Sound of silence except popping

After putting it together I tried to fire it up. The LED is lit but there is no sound more than popping from the speakers. I have tried to power it with two 9V in series and with a transformer, but still the same issue. Any takers on what it could be and how to solve it?BTW for those who do not know, there are no instructions with the kit, however, they are readily available at the manufacturer's website.
Asked by: Blackbear
There is perhaps a few causes to your problem.1. Your 2- 9 volt batteries are just at the lower power limit for proper operation. Try to use more power in both volts & current.2 Pumping, a little involved to explain Here. Also a power problem.3 power phase reversed.4. Amp dip switch or not configured or wired properly .I suggest you visit the amps page at PE and down load the pdf manual. Review it and rewire it accordingly. If this does not solve the problem, return it to PE. They have the best tech assistance & service department in the industry.
Answered by: Nitnub
Date published: 2012-12-12


I'm wondering if this could be modded to a stereo 1/4 input to 2 mono 1/4's to drive a low powered guitar rig? Thanks.
Asked by: buhtweet
Yes and no. Here's why:The mod itself would be no problem. Just wire your quarter inch TS female connector to both the left an right inputs instead of the RCA jacks. You could even put a dual-gang potentiometer before the input for another volume control (though I wouldn't see that there is a need since guitars have pots on them already for volume, tone, etc.)The reason why it might not work is that this amp is designed for a low output impedance device. MP3 players run in the single digits for output impedance. Most set top players are in the 100-1000 ohm range. These devices wouldn't be a problem for this amp. The output impedance of your guitar is in the 100K- 500K output impedance range, meaning that you would have massive insertion loss. If you hooked a guitar up to this amp, you would get some sound, but it would not be what a guitarist is looking for. To be subjective, there would be no "feeling" or "power"--it would sound very "dead."Now, that said, all you really have to do is use a pedal. I use a Sure TA2024 T-Amp with my Telecaster rig and it sounds great. Just run the guitar into your pedals and then into the amp. I know Boss Pedals have output impedances at roughly 1000 ohms. Some other pedals are even lower than that. Low output impedance into this amp means that you won't get much insertion loss and that there will be all of the sounds a guitarist wants to hear. I love hearing my Tele on a class D amp. It creates a nice mix of the clean sound of a class D with the fuzzy and warm tones from the blues overdrive pedal.So use a pedal or several pedals and enjoy...
Answered by: Honest Rob
Date published: 2012-10-30


Customer Projects

Customer projects that include: 2x15W Class-D Stereo Power Amp Kit TPA3122

If you built a project using this product, post it in the Parts Express Project Gallery.

Customer Discussions

Discussions in our TechTalk Forum that include: 2x15W Class-D Stereo Power Amp Kit TPA3122

If you would like to start a discussion about this product, post a thread in the TechTalk Customer Forum.

Recently Viewed Products

Get Deals
emailed to you every week.

Be the first to hear about new and exciting products,special pricing and incredible deals!

See This Week's "GET DEALS" Email
Parts Express
725 Pleasant Valley Dr.Springboro,OH45066USA

© 1996-2014 Parts Express, All Rights Reserved