2x50W TDA7492 Class-D Amplifier Board

Brand:| Model: AA-AB32174
Product Video
The Class D amplifier topology makes this 2 x 50W amplifier board efficient and consume less space than traditional solid state amplifiers.
  • 2 x 50W Class D amplifier
  • Small footprint for space limited applications
  • Built-in cooling fan, pop noise suppression, and over-temp protection circuit
  • 14 to 27 VDC power supply required
Part # 
Weight: 0.6 lbs.  
List Price$29.99
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Buy 4-up$23.62
Part # 320-301
Qty:  EA
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Product Details

2x50W TDA7492 Class-D Amplifier Board

This amplifier board features a state-of-the-art, dual channel Class-D TDA7492 IC, which delivers up to 50 watts per channel. The small 3.6" wide by 4.8" long footprint allows this amplifier board to be used in many applications were size constraints limit the use of conventional amplifiers. Just add a 14 to 27 VDC power supply, signal source, and speakers!

A low noise cooling fan is mounted atop the robust heatsink to maximize heat dissipation. Thermal protection is also included to extend the longevity of the amplifier board. Four fixed gain settings are available to allow for volume control at the source, and stereo RCA line-level inputs are pre-attached. Mounting holes are provided as is a 2.5 mm x 5.5 mm power jack for quick connection. Screw-down phoenix-type terminals are included for quick speaker wire connection.

• Class D amplifier topology featuring TDA7492 amplifier IC
• Heatsink with attached fan
• Pre-drilled mounting holes
• Over-temperature protection circuit
• Click and pop noise suppression
• Phoenix-type speaker terminals
• Line-level RCA input

• Power output (w/ 24 VDC power supply): 50W x 2 (6 ohms, THD 10%), 40W x 2 (8 ohms, THD 10%), 25W x 2 (6 ohms, THD 0.05%), 20W x 2 (8 ohms, THD 0.1%)
• Frequency response: 20 to 20,000 Hz (±3 dB)
• Minimum impedance: 4 ohms
• Recommended power supply: 14 to 27 VDC, 6A regulated
• Fixed gain settings: 25.6 dB, 31.6 dB, 35.1 dB, 37.6 dB
• Power input jack: 2.5 x 5.5 mm, center-positive
• Dimensions: 4.8" L x 3.6" W x 1.4" 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.
2x50W TDA7492 Class-D Amplifier Board
  • BrandParts Express
  • ModelAA-AB32174
  • Part Number320-301
  • UPC844632096679
  • Product CategoryAmplifiers
  • Unit of MeasureEA
  • Product Rating
    (8 Reviews)
  • Weight0.6 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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2x50W TDA7492 Class-D Amplifier Board
2x50W TDA7492 Class-D Amplifier Board is rated 4.625 out of 5 by 8.
Rated 4 out of 5 by from Great AmplifierI bought this because the amplifier in my Altec lansing stopped working. I analyzed a lot before purchase as to which watt will suit my need. The amplifier is very good quality built. I use multiple speakers to play a single source. A volume control for my requirement was must. I assembled all the stuff and used old IBM laptop power supply 16v 3.5A. The sound is great and is exactly what I wanted. Parts express has the best prices. Looking for a nice subwoofer.
Date published: 2014-01-10
Rated 5 out of 5 by from Nice find.A nice quality amp for the price. Have it hooked up to 2 Book shelf speakers built with components bought from PE also. Powered by a 18.5V 3.5A laptop power supply.Nice upgrade from an old Teac passed down.Pic -->
Date published: 2014-03-31
Rated 4 out of 5 by from What a find this was!I bought this amp for an outdoor ipad music setup to play music at a wedding. I did not think an amp at this cost would work very well but I gave it a shot. It totally surprised me with power and quality. I used a Sony laptop power adapter with 19v and two HiVi F5 5" Bass/Midrange part #297-435 and a passive sub and they sound great. I also added theBT-1A Bluetooth Receiver Module Part # 320-353 to use them wirelessly with the ipad. O I also was able to use this setup as a pa system for the wedding. I cant wait to get more.
Date published: 2014-03-31
Rated 5 out of 5 by from Love this amp.I bought this to power a set of "shop speakers" but it never left my desk. I hooked it up to a set of home built computer speakers just to hear what it sounded like. I liked it so much I decided to leave it on my desk. I had a hard time finding a tip locally for the power supply I am using (19v from an old laptop, I removed the old tip and soldered on a new one). I am going to eventually build the "shop speakers" and put this amp to proper use...... Someday.
Date published: 2013-06-17
Rated 5 out of 5 by from WowI bought this for a project with my son. Exceeded our expectations. We are going to get a few more for other projects.And of coarse thanks to Parts Express!
Date published: 2013-08-16
Rated 5 out of 5 by from Flexible and fun!I will preface this by saying that I had access to a early-eighties vintage Naim NAPSC power supply that I modified to about 20VDC output. Nicely regulated power is a good thing!With a pair of Acoustic Energy Aelite Ones, this little amp just sings. Seriously. I won't even add the qualifier "for the price"... it's just a good, solid amp. Be sure to adjust the gain setting via the DIP-switches to get the most out of it.With a tidy little enclosure (also purchased @ Parts Express), it couldn't be any more portable as well.
Date published: 2013-05-23

Product Q&A

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2x50W TDA7492 Class-D Amplifier Board

Is 6 amps the minimum to use for this board?

I have a 24 volt power supply with 1.2a that I planned on using for this. I know that this amp won't get me the most power, but how do you think it will perform? Does the power supply rating need to be over 6 amps that this board calls for? Any info about this would be greatly appreciated!
Asked by: Grenadineflaps
Should work just fine--it just won't have the power to drive this amp to a full load. A perfect 1.2 amp power supply at 24 volts would be able to drive 28.8 Watts into this amp. Considering that most home audio speakers have efficiency of about 85db @ 1W (conservative estimate), you should be able to drive each channel to around 95db without any clipping (14.4W each). Your supply probably can't drive the full 28.8 watts in reality, but I think you'd be able to get at least 24 watts out of it without breaking a sweat. Class D amps are about 85% efficient (another conservative estimate) meaning about 20W total max output to the speakers. 10W per channel will still give you 10db above speaker sensitivity.So to answer your question, yes, I believe your PSU should work just fine.
Answered by: Honest Rob
Date published: 2014-02-03

what would i need to add volume control for this board?

Asked by: mjc.paul
a pre-amp...now ya gotta think about this because your source may already have one, like an mp3 player generally has an out put volume control, k bingo...now if your running vinyl, that's different, and you're likely going to need an RIAA type pre, which may or may not support different sources under one master volume..( i'm shure you can take it from there)..
Answered by: rulgert
Date published: 2012-03-07

Power Supply on 2-pole Connector

Hi,I've soldered a 2-pole connector on the amplifier board for the power supply. I have connected a 19V DC power supply (4,7A) on it, but nothing happend. No led is burning, the fan doesn't work. What do I wrong?
Asked by: KevinBel
Find a meter and check the polarity of your power supply output, also the unloaded output voltage. These boards have a diode on the power input, so if the polarity is wrong, you did not damage the board, but nothing will happen.Better to use the built in Phoenix connector for power--soldering onto one of these boards, unless you have a very low wattage soldering iron usable for surface mount boards is a bad idea.
Answered by: Doc Jones
Date published: 2013-07-29

Bridged or tri-mode?

Can this board be bridged or run in tri-mode (2 sats and a sub)?
Asked by: shamie
Best to run it as designed - a 2 channel amp. You would use it to run your sats, and a separate subwoofer with its own amp
Answered by: MarkAJH
Date published: 2012-12-08

Under the SW1 switches there is a +5V and GND hole in the PCB, can I use this as a source?

Under the SW1 switches there is a +5V and GND hole in the PCB, can I use this as a source? (see picture)I am recycling an iPod dock from a clock radio and am looking for 5VDC with less than 1A for the charging position on the 30-pin dock. I have a 24VDC 6A power supply (part #320-314) for the amp.
Asked by: JoeEngineer
Those 5v outputs are designed for Sure's volume control board and probably offer very little amperage. I would NOT suggest using them to try and power an iPod. Use a voltage regulator and tap off the output of your 24 volt power supply.The 7805 Voltage regulator will handle up to 35volts of input and give you a solid 5volt /1 amp output to use for the ipod dock. And the best part? it's only $1
Answered by: Beatnik
Date published: 2013-02-23

Can I run this off (2) 12 volt batteries in series to 24 volts?

I want to use this for my boat speakers and I have a set of batteries wired in series to 24 volts in the boat for my trolling motor can I use those batteries to power this at 24 volts? Im 99% sure I just need a conformation. Thank you for anyone that helps me answer this question.
Asked by: cfarrias
Yes--This will work. Especially if you use two of them in series already for your trolling motor to get the 24 volts. Marine deep cycle batteries would be best--but not essential though. Older cars sometimes used two 6V batteries. Do you also have a generator in line to recharge your batteries? The full charge up usually is a volt or two above the rated power--not a concern here though. I've done a lot of work in SF for the Yachting community and have seen a lot of interesting setups.
Answered by: Joe from San Francisco
Date published: 2013-10-12


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