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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. This amplifier board also works with the rotary encoder with volume control board.
  • 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
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Your Price
Buy 4-up$18.50
Part # 320-332
Qty:  EA
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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. This amplifier board also works with the rotary encoder with volume control board.

• 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
• Dimensions (mm): 110.2 L x 68.6 W x 16 H

Product Specifications
  • Power Output (RMS Per Channel @ 8 ohms)20 Watts
  • Power (RMS/Channel 8 ohms)0 - 25 Watts
  • Special FeaturesBoard Only Module
  • Weight Range< 10 lbs.
2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only
  • BrandParts Express
  • ModelAA-AB32165
  • Part Number320-332
  • UPC844632099205
  • Product CategoryAmplifiers
  • Unit of MeasureEA
  • Product Rating
    (10 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.

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2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only
2x25W at 4 Ohm TDA7492 Class-D Audio Amplifier Board Only is rated 4.7 out of 5 by 10.
Rated 3 out of 5 by from 25wpc Digital ampThis unit is a small very basic audio amp. I have never played with one of these before, and I wanted to do a small audio project for the kids...The directions are basically enough to get you going, and very lacking in to what type, and rating of power supply to use. ( it is translated from Chinese, so don't expect much) For my project I used a 12vdc 8.3A switching PS. It seems to work fine. One thing (very) lacking is any form of rudimentary volume control, I'm using a (PE) bluetooth receiver that has its volume via the bluetooth commands... An accessory volume kit would make this unit "MUCH" better and more useful for other audio projects.. 3 stars
Date published: 2014-03-29
Rated 5 out of 5 by from Great little ampThis little amp board surprised me.  I play around a lot with home and pro audio equipment.  I built a self powered speaker box to play music from my phone.  Used this amp board, 19v laptop power supply, and speakers/crossovers from a JBl outdoor speaker box.  Built a box for it out of MDF and sounds great.  Putts out a lot of volume from a cell phone input.  Would be nice to be able to adjust your tone/EQ before the input, but over all very happy.  Sounds even better with Ipod that has EQ options.  Nice and small, easy to hook up.
Date published: 2014-03-29
Rated 5 out of 5 by from Perfect to embed in a cabinetLately, I have been doing a lot of 1970's era floor cabinet refurb jobs for friends... and their friends... and their friends.These amp boards are the ideal tool when I do the job. Here's what's getting people hooked:I take a well made cabinet, usually from the 1970s or 1980s. I gut the drivers and examine the crossovers. I usually end up replacing the crossovers and always replace the drivers.Enter the amp board. I install the amp board INSIDE the cabinet. Sometimes, I only use one channel and put a board in each cabinet and make an auxilary out terminal to add an additional speaker. Sometimes I wire the second channel to the second cabinet in a stereo setup.Then I put in a bluetooth receiver and feed it power; hook it to the board. Viola! These clean sounding, perfect little boards can be LOUD with the right speakers. And people LOVE having a set of retro looking, yet high tech, speaker cabinets to play music from their phone or tablet with.I highly suggest downloading the manual and printing yourself a copy for every amp board you buy. There are switches that can control volume and you'll learn a lot about this kind of amp, the different configurations for power, and possibly using the rotary encoder. You learn in general, by using the manual.My project isn't the only thing you can do with these amps. Use your imagination to make powerful, portable systems. Comb this site for enclosures and make a stand alone amp. You could use this for your extremely awesome 7.2 surround in an auxiliary position or for a different zone in your house. The limits to where these can go / be installed are endless! They are small and efficient.I often read reviews where people take point off for features. Well, this is a stripped down amp board. It's not going to have an EQ and seven inputs. That's not what it's for. I give it full marks in all categories because it is versatile, dependable, affordable and a ton of fun.One tip, get the right power supply. These things operate the way they are supposed to as long as you give them what they need.Now go have fun and invent something!
Date published: 2014-03-29
Rated 5 out of 5 by from Great Little AmpInstaled this amp in a diy portable boombox using 4 of the tang band 3inch buyout speakers and it sounds amazing.
Date published: 2014-03-24
Rated 5 out of 5 by from nice little ampNice little amp, small enough to be built into a cigar box. Want something mobile with enough power to push some bookshelf speakers and this delivers.
Date published: 2012-12-14
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: 2014-03-23

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

Bass Increase?

I just bought this little amp and plugged everything in. the Rotary encoder board works and there is music playing, but the bass seems to be really weak. I am not a bass junkie, but a little more bass wouldn't hurt. does anyone know how to increase the bass? or if I need to, which capacitors should I change with larger ones to increase bass level?
Asked by: gabem
The cure depends on a few things.First - did these speakers ever produce the bass levels you want - at normal listening levels? If the answer = YES...see below. If you have no proof that the speakers can produce the bass you want - the problem may not be the amp. Temporarily hookup the speakers to a big amp and see what you get. If that is OK - read on. If still weak - the speakers are the problem....OR your new amp cannot produce enough power at bass frequencies to make you happy. Bass uses 50x more power than mids and highs.If the speakers are OK - the problem MIGHT be that the coupling capacitors on the output stage of the upstream source ....or the coupling caps on the input to this amp are too small. Putting larger values IN PARALLEL with the the existing ones is a good experiment to see if the bass gets better. This is a VERY tricky thing to do if you are not savvy regarding electronics.For the followign answer - I will assume you know electronics. If the following does not make sense to you - don't try it as you could blow up stuff. Start with the output stage of the upstream source. Use coupling caps that are 10x the value of what is used now (or higher). You will need the schematic for the upstream device. Test for DC across the existing caps (all items connected and powered up) to see if polarization will be important. If DC of more than a 20mv exists - use either Non-Polar caps or polarized ones installe in correct orientation. testing by clipping the outboard caps across the on-board ones is good enough to listen and decide. Once you know that big caps are the solution you will have to actually install them by soldering to the PCB. If you still don't have enough bass - move on to the power amp. Good luck
Answered by: Designer Guy
Date published: 2014-03-23

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
The only drawbacks you will get are:1. You won't be getting the full rated power of 25W/channel2. It might shut off as the battery dischargesOther than these 2 things, there is pretty much nothing that can go wrong. Using a power supply voltage lower than the recommended value can't wreck this amp.Some more details about these 2 drawbacks:1. This amp is rated for 25W/channel when powering 6 ohm speakers, and when using a 15V power supply, according to the specs. As with all of these amps from Sure Electronics, the actual output power will depend on the power supply’s voltage: the higher the voltage, the higher the power. So, because your 12V battery’s voltage is lower than the voltage used for the specs, you’ll get less output. But, the differences here are minimal (15V vs 12V isn’t much).2. As the battery discharges, its voltage will drop. When the battery is fully discharged, it will be about 10.5V (when still connected to the amp), and about 11.7V when open-circuited. So, although your battery is able to turn on your amp when it’s fully charged (which will be a voltage of 12.6V), it might not be able to keep it on as it discharged.Also I must point out one thing that another answerer incorrectly stated: at full charge, your “12V” battery will NOT be at a voltage of 13.8 − 14.4V. This seems to be quite a common misconception about 12V lead-acid batteries. A 12V lead-acid battery at full charge with nothing attached to it (aka open-circuited) will have a voltage of 12.6V. The 13.8 − 14.4 volt level often incorrectly mentioned is actually the charging voltage that car alternators apply to car batteries. When the car is running, that is the voltage you’ll get if you measure the terminal voltage of the battery. Turn the car off, and over the course of a few hours it will settle back to 12.6V if it’s fully charged.
Answered by: eboyer
Date published: 2013-08-02

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
I own this very amp and have not seen those markings on it, but I do not believe the amp is designed to power anything except its self. You could use a power supply 5V and at least 500mA higher than the one you are using, yet still within the tolerance of the amp; then let the iPod feed off of the same power supply and still maintain the same performance.
Answered by: dkward
Date published: 2013-01-03

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

Max votlage?

Would this handle a 19.5V laptop power supply?
Asked by: Beatnik
It states the max voltage for this board is 19v in the description. However, I imagine this is a slightly conservative estimate. I would not hesitate personally running this with a 19.5V power supply, but you would be using outside of its published specifications and thus most likely voiding your warranty. Its probably a pretty safe bet, but its your 20 bucks.
Answered by: Travis Rysdam
Date published: 2012-12-16

Any PS recomendations? I see that 320-316 looks like a good supply for a 2X100x (320-334) but @24 volts it would not be good for this one.

Asked by: buyer
I do not see any PSUs on Parts Express that would offer up any more than 15-16.5 total available watts (see below).Personally, I would look for an old printer or laptop power supply (brick) that you don't need anymore. Many of those run at 14-19 volts DC and would provide adequate amperage to get the most out of this little board.95 watt laptop power supplies that put out 19.5 volts at ~4.9 amps are very common. Use your judgment with these as they are technically over the specified voltage that this board can take (by half a volt).
Answered by: Travis Rysdam
Date published: 2012-07-23

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