2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only

Brand:| Model: AA-AB32165
Choose this 2 x 25 watt amplifier board to power your next speaker project. A Texas Instrument's Class D TDA7492 amplifier chip is employed to produce high fidelity sound efficiently.
  • Pre-assembled, pre-tested
  • Superb sound quality
  • Perfect Class D architecture
  • Two channels—each up to 25W
  • Up to 90% efficiency
  • Does not require a heat sink for most applications
  • Line level analog audio input
Part # 
Weight: 0.65 lbs.  
List Price$39.95
You Save50%
Your Price
Buy 4-up$18.50
Part # 320-332
Qty:  EA
Available Payment Methods

Product Details

2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only

This Class D dual channel amplifier board employs a Tripath-style Texas Instruments TDA7492 chip. Each channel is rated at 25W, delivered with state-of-the-art sound quality. The TDA7492's efficiency eliminates the need for an external heat sink when playing music under average listening conditions. Integration of high-quality capacitors ensures hi-fi amplification output. Requires a DC power supply ranging from 14 to 19 VDC (available separately) and can be used to drive any 4 ohm or 8 ohm passive speakers. Gain control is accomplished by setting two DIP switches, and there are four gain modes available: 24.6 to 26.6 dB, 30.6 to 32.6 dB, 34.1 to 36.1 dB, and 36.6 to 38.6 dB. .

• Output power (x 2 channels): 20W @ 8 ohms (15 VDC <0.08% THD+N), 25W @ 6 ohms (15 VDC <10.0% THD+N) 
• Frequency response: 20 Hz to 20 kHz (±3 dB)
• Signal to noise ratio: 100 dB (A-weighted)
• Power supply range: 14 to 19 VDC
• Gain settings: 24.6 to 26.6 dB, 30.6 to 32.6 dB, 34.1 to 36.1 dB, and 36.6 to 38.6 dB
• Input impedance: 48K ohm minimum, 60K ohm typical
• Input sensitivity: 640 mV @ 25.6 dB, 320 mV @ 31.6 dB, 210 mV @ 35.1 dB, 160 mV @ 37.6 dB
• Dimensions (mm): 110.2 L x 68.6 W x 16 H

2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only
  • BrandParts Express
  • ModelAA-AB32165
  • Part Number320-332
  • UPC844632099205
  • Product CategoryAudio Amplifier Boards & Modules
  • Unit of MeasureEA
  • Product Rating
    (11 Reviews)
  • Weight0.65 lbs.
  • California Prop 65

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

Similar Products

View similar products to the 2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only
in the Audio Amplifier Boards & Modules product category.


2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only
2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only is rated 4.6364 out of 5 by 11.
Rated 5 out of 5 by from Great little amp!Using this amp to power a set of desktop speakers I made and it preforms flawlessly. Thanks to the efficiency of this amp, the speakers can be very loud with little to no distortion, plus the sound is crystal clear. Using a 19V @3.34A laptop power supply with no problems. would recommend in a heart beat!
Date published: 2012-12-12
Rated 5 out of 5 by from This is a very good little amplifier board......and the design has clearly been improved from the units that got so-so reviews elsewhere (diy Audio to be exact) a year or so ago. The manufacturer has clearly heeded the reviews and changed the output filter components from those specified earlier. This board sounds much more powerful than its ratings, and the sound quality is nearly the same as for the late lamented TI 3123D2 board this replaces, just a little less transparency in the midrange according to my jaded ears. However, this board has much more headroom than the older product. I am itching to try out the 7498 board now. I am currently driving this board with a 19 VDC supply (54 VA 12VAC transformer into bridge rectifier into pi filter with 3200 uF caps (no regulator circuit) with excellent results.In terms of gain this board has less than the comparable TK2050 Tripath boards, so a preamp may be necessary. I have been building my own preamp boards using the NTE1803 line level control preamp chip with excellent results, using the reference design for the Philips TDA1524 chip this replaces. The Velleman preamp kit sold by PE will also work well with this.
Date published: 2012-11-27
Rated 5 out of 5 by from Great for my usesI bought this a while back, and I can say now that after owning it for about 6 months, it greatly exceeds my expectations. pairing this with the rotary encoder board makes for smooth volume changing. I use this to power a pair of small bookshelf speakers in my room. Sometimes I bring them into the kitchen when i am cooking also. Cranking this little amp all the way hurts my ears :)) my speakers are rated at 50 Watts RMS, but I have never pushed the amp all the way, so I am not worried about clipping. Trust me, 25W is enough for any indoor application. easy to set up and works like a charm. What more could you ask for?
Date published: 2012-09-13
Rated 5 out of 5 by from Gets the job doneI put this in a noisy van to drown out engine/wind noise. It works great and runs cool, even cranked almost all the way up. There are some switches that give limited gain adjustment. I would have liked better control over that, but I found a setting that was adequate. Frequency response exceeds the quality of speakers and background noise by far. Stereo actually sounds good when parked.
Date published: 2012-09-12
Rated 4 out of 5 by from Great while it workedI am only taking off one star as this amp worked great for the first day, the next morning it would not power on and the on board LED would keep blinking. I contacted PE about the issue and sent a replacement immediately since it was a hardware fault, no hassle at all, I've been building high-end computers for a number of years and I have never had as good of service with any of the suppliers I have as I have had with PE. Thank you Parts Express!
Date published: 2012-08-15
  • 2015-04-19T06:37CST
  • bvseo_cps, prod_bvrr, vn_cps_3.1.1
  • cp_2, bvpage2n
  • co_hasreviews, tv_0, tr_11
  • loc_en_US, sid_320-332, PRD, sort_mostRecent
  • clientName_PartsExpressInternational

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.
2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only

how would I wire in the Input signal? there is the J1 box that has 8 holes between the 2 RCA inputs and it looks like you connect the 1 channel into side, then hook in the other channel to the other side and ground wires into the middle 2 spots?

Asked by: bcboyz86

Would a 15V 1.4A power supply work with this amp? I'm not sure that 1.4A is enough.

Asked by: AlwaysBreaking
Yes. I have that adapter. The fellows 15v it's a buyout special. It's rated 1.4 but it actually puts out 2.5 amps at 15v and something like 3 or so at 14v .yeah it works good.
Answered by: jim80
Date published: 2015-03-25

Is it possible to bridge this amplifier? If yes how would I go about doing it? 

Asked by: Tyler99
This amplifier cannot be bridged.
Answered by: MattP
Date published: 2015-02-11

The amp pictured has a heat-sink, yet the description indicates it doesn't need one. Is there a heat-sink installed on the board as shown?

Asked by: Jimmy630
Yes this does include a mounted heat sink as pictured. I will have the copy fixed.
Answered by: MattP
Date published: 2015-01-09

Would a 4 amp power supply work for this amp?

Asked by: The Tank
Yes as long as the voltage is in the operating range of the amplifier.
Answered by: MattP
Date published: 2014-11-12

Would this amp behave nicely in a car setup, simply hooked up to the battery and chassis ground, without picking up alternator noise?  Also, would it make the dreaded turn on pop if setup in a delayed turn-on configuration? 

Asked by: svaric2
This will work well in a car application, alternator noise should not be an issue if properly ground. You should have no issues with turn on pop if used with a power up delay.
Answered by: MattP
Date published: 2014-09-23

Can this amplifier be bridged to send a summed stereo signal to one speaker?

Asked by: trd86
Unfortunately this amplifier is not bridgeable.
Answered by: MattP
Date published: 2014-11-08

Could I power this with two 9V batteries?

Asked by: Shayd
Technically you could assuming the batteries were in series, although it is not recommended. 9 volt batteries generally have very little current so they would not last very long. A 12V SLA battery would be a better choice but worst case scenario would be 8 high storage AA batteries.
Answered by: MattP
Date published: 2014-05-13

I would like to use this amp in the roof space with 2 ceiling speakers and a Bluetooth adapter so I can play musi using my iPhone.  However I need the amp to be in a box to protect it from being a fire risk. Any thoughts on how to do this?

Asked by: Cookie
There are plenty of ways to do this, it will be up to how much work you want to put into it. Some people build nice chassis for these with RCA, binding post and power connectors on the outside, while others simply put them in a wooden or metal box and just feed the wires through holes. Some people even leave them completely exposed, which will not hurt anything either as long as they are out of the elements.
Answered by: MattP
Date published: 2014-04-22

can this be used with one 4ohm load safely?

Asked by: bobbyo
I would not recommend this for a 4 ohm load since the manufacturer only rates it down to 6 ohms.
Answered by: MattP
Date published: 2014-02-04

How would one go about adding tone control to this board?

Asked by: SeanC
A pre amp will have to be used in order to add tone controls to this board.
Answered by: MattP
Date published: 2014-01-30

SW1 has two micro switches that came defaulted to both ON. What are these for?

Asked by: Rich99
The dip switches are for gain control adjustments. Gain control is accomplished by setting two DIP switches, and there are four gain modes available: 24.6 to 26.6 dB, 30.6 to 32.6 dB, 34.1 to 36.1 dB, and 36.6 to 38.6 dB. There should be directions in the manual for how these should be set.
Answered by: MattP
Date published: 2014-11-08

power supply

what would a good power supply for max outputwill this one give me full output?
Asked by: speaker freack
Unfortunately that will only supply 1A which will not be ideal. We usually recommend the 320-3140 with the voltage turned down to 20DVC. This can be done using a volt meter.
Answered by: MattP
Date published: 2014-07-15

Dumb Questions

Hi, i have a few general questions.I understand that when choosing a power supply, the total voltage x amperage rating should match the expected output of the board (after efficiency is factored in). So, what's the difference between a 12v 4a power supply (48w) and a 16v 3a power supply (48w)? or even a 24v 2a (48w) power supply. What are the differences and advantages, if they all output the same in theory?Do i need to build a separate enclosure for this board? it will be mounted on the inside of a boombox, away from the elements. I'm not sure if that's sufficient, though.Will this amp play sound in stereo, with separate sound coming from the left and right channels? Or does everything just come out of both left and right?Also, what exactly is a pre-amp, and why would i need one/what purpose does it serve?And lastly, what do the gain controls for this amp do, what is their effect on sound and output, and what is the proper way to set them? I have a DD-1 for car audio gains, but i don't know what to do for this one.Thanks in advance. Any explanation will be greatly appreciated; as i learn best from understanding things, and will be able to better understand the products i am buying, and make more informed buying choices. Cheers.
Asked by: Daniel1317
You need a 14v to 19v DC power supply to operate this board. If it's mounted on the inside of a "boom box" it should be OK if it's away from the elements. This will play stereo. A pre-amp takes a weak signal from a phonograph, guitar or anything below -20db and boosts it to "true line level" for the amplifier to work at full potential. Set a pre-amp so there is plenty of volume, but no distortion or noise. [use your ears for this]. Gain is "cut or boost" of the original signal--not to be confused with a volume control--but adjustments affect volume B4 the amplifier stage. Great questions!! Good luck to you!!
Answered by: Joe from San Francisco
Date published: 2015-03-05

button volume control and on and off control?

Asked by: jamesbeck
You can use an on/off switch wired to the power supply. A volume control should be wired to the signal inputs. I have listed a few for you to look at.
Answered by: Joe from San Francisco
Date published: 2015-03-01


hi me again lol, can i use this with a 24V power supply. if not what should i use
Asked by: speaker freack
This amp will only work with voltages between 14 and 19 VDC.
Answered by: MattP
Date published: 2013-09-03

whats the L,W and H in inches?

Asked by: speaker freack
4.34"L x 2.7"W x .63"H
Answered by: MattP
Date published: 2013-09-03


can i use this to power a TANG-BANG 5-1/4 inch subwoofer part number 264-917
Asked by: speaker freack
Yes, this amp would work fine with that driver. The channels on this can't be bridged, and the Tang Band subs are 4 ohms, so just hook up one driver per channel.Since you are looking to power a subwoofer, make sure that you use a robust power supply that gives the board 19 volts at 4 or more amps. This should help ensure that the amp has enough juice to keep the speakers from clipping too easily.Even with that, remember, that is a 5" subwoofer. It will perform nicely, but it will never fill the role of the 12"s in a trunk, or a nice home theater subwoofer. It was really intended for like a PC gaming or movie set up where you are sitting very close to the subwoofer.
Answered by: Travis Rysdam
Date published: 2013-08-16

4 ohm performance?

Anyone tried this board at 4 ohms? I'm working on a DSP curved CBT array that will require individual amplifier channels for each driver pair. I'll be using Emotiva 7-ch amplifiers for most of the array but need something low power for the ends where shading reduces the power requirement. The highest power requirement will be 17 watts. I'm thinking these should work fine. Thoughts?
Asked by: monte
The 25 watt rating given in the product listing is for a 4 ohm load, assuming you are using a 19 volt power supply with adequate amperage (4 amps should be plenty). The 6 ohm 25 watt spec given in the description is at 10% THD. Given that info, at 4 ohms this board should be able to put out 25 watts at ~1%THD.This should work fine for you, and at 17 watts the output should be very nice from one of these boards.You will most likely need something to adjust the low level signal going into the board in order to level match it to the output from your nearby Emotiva amps. You can use the rotary encoder below, or just a dual ganged stereo potentiometer.If you are looking for a power supply you could use a laptop power supply, like the one below (19V @ 4 A). i have had good results with a similarly spec'd OEM PSU.
Answered by: Travis Rysdam
Date published: 2014-06-20


Thinking of building a portable powered speaker with a rechargeable battery. Any battery suggestions and power supplies?
Asked by: VijayVin
Any 5 or 7 Ah sealed lead acid type battery will be perfect for this amplifier. I would recommend our Grip Tools float charger for charging.
Answered by: MattP
Date published: 2013-09-16

Does this amp cause speakers to "pop" when turned on?

I am thinking about integrating this amp in a boombox build and I would like to wire in a simple power switch on the + wire between the power supply and this amplifier. If I do that, will flipping the switch create a "pop" or "bump" sound in the speakers when the amp powers on?
Asked by: tycham85
Wiring a switch in line with the power is not a problem and is very common. This will not cause a popping sound through the speakers.
Answered by: MattP
Date published: 2013-05-08

What size is the DC in?

I saw in another question that the user Beatnik recommended getting the "Universal Laptop Power Supply" (PE 120-500). By using different DC connector tips, the power supply will regulate voltage. I looked at the manual for this amplifier and it doesn't specify a size for the DC connector, so I was wondering if someone had this and could verify which tip size it is. Another answer here implied that it might be 2.1mm x 5.5mm, which isn't a supported tip of the power supply I mentioned previously.Additionally, if someone knows of a better power supply to use with this board, I'm all ears. I've been looking into this for the past hour, and that Universal PSU seems like one of the better bets.
Asked by: tycham85
The DC Jack for the amplifier is a OD 5.5mm x ID 2.5mm coaxial.Two things to consider with the Universal Power supply. First off is a noise. Generally this can be overcome with some filtering caps and/or a linear regulator circuit. Second is the tip/voltage selection problem.I first suggest picking up some two screw terminals (PE 320-3370) for the power input to the amplifier. One of these can be soldered right next to the DC jack for you power input.The universal supply uses a 6-pin mini DIN plug. Four of the pins carry the +/- supply. The other two are a voltage reference that determines the output voltage of the PS. So at minimum you will need to determine a voltage divider circuit (two resistors) to set the 16 volts.Another option would be to use a tip with a higher voltage, then use a linear voltage regulator IC with MOSFET power transistor to handle the current.Best of luck.
Answered by: JDoyner
Date published: 2013-05-06

Would this work with a 18.5v li-ion battery which has a voltage range of 15-21volts from fully charged to discharged?

Asked by: WhitewindDesigns
Yes this will work fine with a battery as you described.
Answered by: MattP
Date published: 2013-03-29

Power, mute, and stby switches.

It appears there are board markings for power, mute, and stby. Are they for switches? If this is so, how would it best be done, and with what switches?Thank you.
Asked by: Frugalphile
All of the power markings are for power in. You can also use them for piggy backing power in to more than one board. Simply put a switch in the power line to break current flow to the board. Better practice would be to add an isolation device to protect the user from all the amperage going into the board (Use of relay, Power Mosfets, Darlington Transistor, etc) and switch that lower current device instead.To use the mute and stby, all you need to do is switch to ground. The Pull up resistors and smoothing capacitor is on board already.
Answered by: JDoyner
Date published: 2013-03-25

Are the TDA7492 and

TDA7498 boards the same?http://www.parts-express.com/pe/showdetl.cfm?partnumber=320-332 on the right actually shows TDA7498, at least this is what I can see at the top of the schematic
Asked by: WiesiekL
The TDA7492 and TDA7498 are from the same family of chips and also have the same pin out(See photos below). However they do have different power ratings. Also looking at the boards(PE 320-303 and 320-332), they are very similar suggesting the schematics are the same. I own the TDA7492 and it has pin outs for the 12v Fan that you see on TDA7498.TDA7492Features■ 50 W + 50 W continuous output power atTHD = 10% with RL = 6 Ω and VCC = 25 V■ 40 W + 40 W continuous output power atTHD = 10% with RL = 8 Ω and VCC = 25 V■ Wide-range single-supply operation (8 - 26 V)TDA7498Features■ 100-W + 100-W output power atTHD = 10% with RL = 6 Ω and VCC = 36 V■ 80-W + 80-W output power atTHD = 10% with RL = 8 Ω and VCC = 34 V■ Wide-range single-supply operation (14 - 39 V)
Answered by: JDoyner
Date published: 2013-03-21

Power supply

I have a project I'm working on. I'm taking an old antique radio and turning it into an iPhone speaker dock. I'd like to use this amp to power the speakers, but I don't have a ton of space for a big power supply. So here's my question, will this wall wart (PE Part#: 120-052) work for this?
Asked by: jordanhatch
Not even close. First it only provides 12V and secondly it is only 2 amp supply. To get event somewhere close you would need 3-4amp and 15V supply. The specs. states that 14V is minimum and 19 max. Counting some losses 19V 4amp would be preferable, but 15V 4amp would do and is maybe more easy to acquire.
Answered by: PasiPT
Date published: 2014-03-23

Is there a 5 volt out on the amp board?

I bought one of these amps to make a small desktop system and couldn't be more happy with the results. My set up just uses a adapter cable from the headphone jack on my smartphone to the inputs on the amp. Now I have a friend that wants me to make them an ipod dock. I want to use the Ipod connector and can get a cord that adapts the connector to RCA jacks. The cord also has wires to go to a 5v source so that the Ipod can charge while connected. Looking at the board I see it's marked with 5v + and a ground. Is there indeed a 5v output at the board I can connect to? Thanks in advance!Steve
Asked by: Chiguy
The board has a 5V output which is meant to power the rotary encoder and volume control board accessory. It probably can't provide enough current to charge an iPod and attempting to do so would likely damage the board. You'll need either need to add a separate 5V power supply or regulate the 15-19V DC that's powering the amp board down to 5V.
Answered by: Stowbari
Date published: 2014-03-23

Part Number for PS plug?

Can you provide the part number(s) for the appropriate plug to terminate the power supply connection with? Is this same plug used for all the SURE amplifier boards, or do they vary? I am looking to use this board for some small sattelites along with a second, higher power board for the small subwoofer.
Asked by: Sfritz
I have linked the connector you are asking for, and I believe that if you want, you can buy the same thing at a neighborhood electronics store and it is called a K type connector. Your plan is actually really good to use this amp as the surround and a big amp board for the subwoofer. Also, yes they all tend to have the same connector. Best of luck with your project!
Answered by: BigRich92
Date published: 2012-09-18

Work with a 12V power supply?

I've tested this briefly by powering it with a 12V battery and it seems to work okay. It appears to be loud enough for me, but by using something below the specified requirements (14V-19V), could there be any drawbacks?
Asked by: PaulM
Well by using the proper "12v" battery, you will actually be meeting it's needs. A "12" volt lead acid battery, like an SLA, actually exhibits a common voltage of 13.8-14.4 volts. Also, chances are, 12 volts might actually work, but as you guessed, it would produce a lower output if any at all. Best of luck, and if it works, then no harm done, seeing as it's below specs. Not like you can burn it out lol. Hope this helped.
Answered by:
Date published: 2012-07-07

Power on pop?

This amp is great when playing but when I plug in the power source (from a walwart), I get a loud "pop." actually two "pops" and then the board seems to be working fine. I don't know if the chip is okay with that or if that signals something is going wrong. Also, when I plug in my power source, I get sparks from the DC power input socket. maybe my board is just defective but I thought I should ask.
Asked by: gabem
The chip is fine, the pop you are hearing is a momentary DC offset that occurs when the capacitors on the amp board are being charged ,and then discharged when you turn it off. It happens to everyone with chip amps, and it is unlikely to hurt anything (unless you are running a tweeter with no crossover). Most commercial amps have a built in "soft start" circuit that tames this. You can build a soft start circuit pretty easily if this really bothers you, but most people just deal with it. Check forums for plans for soft start circuits.Below is an example of one I found.Also, the sparks you see are probably normal too. Most of the time you can't see the inside of a receptacle in which you plug a wall wart, but in this case you can.
Answered by: Travis Rysdam
Date published: 2013-01-21
  • 2015-04-19T08:34CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.1
  • cp_2, bvpage2n
  • co_hasquestionsanswers, tq_41
  • loc_en_US, sid_320-332, PRD, sort_recentQuestionsFirst
  • clientName_PartsExpressInternational

Customer Projects

Customer projects that include: 2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only

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

Customer Discussions

If you would like to start a discussion about this product, post a thread in the TechTalk Customer Forum.
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,OH 45066USA

© 1996-2015 Parts Express, All Rights Reserved

Live Chat Software