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This product will be shipped using FedEx (shipping cost per order: US$ 25). Delivery in 4-7 business days. Check out this page. 

TSA9840 2x20W audio amplifier board comes with  Audio B plus Bluetooth module. It has a perfect class-D architecture (based on MAX98400A) and each channel has 20W power output. Both channels are capable of giving nominal power output simultaneously and continuously.

This board can be powered by any DC 10V-24V power supply. It can be used to drive two 8Ω passive speakers.

TSA9840 can also be connected with our TSA1000TSA1010 or TSA1020 external audio volume control boards. Users can adjust the audio volume by rotating the real knob.

It is perfect for your Hi-Fi audio applications. You can pair it up with your mobile phone or computer. Power up the amplifier board and use your phone to search for a new Bluetooth device. The module will appear as "TSA9840". You don't need a PIN, it pairs up automatically and ready for playing music.

  • TSA9840 can auto-detect the Aux in/Line in Audio input. Bluetooth Audio source has higher priority. When Bluetooth audio is paused or Bluetooth is disconnected the amplifier will select the Aux in/Line in.
  • There is an extra LINE OUT audio output jack. It can also be connected to a subwoofer amplifier board.
  • BVC Port: BVC port can be connected with our Audio volume controller to control the Bluetooth audio volume. 

TSA9840 can auto-detect the Aux in/Line in Audio input. Bluetooth Audio source has higher priority. When Bluetooth audio is paused or Bluetooth is disconnected, the amplifier will automatically select the Aux in/Line in.


TSA9840 + TSA1000, both Aux in and Bluetooth audio volume can be controlled through BVC port.

Specification: The following table lists all typical data of the amplifier board. For full specification, please refer to the datasheet of MAX98400A chip.TA = 25℃, fin = 1 kHz sine wave, RL = ∞, VVS = 18V. (Unless otherwise stated)







Supply Voltage (VDC)

Inferred from PSRR test


- 24
Current Limit   3.5A 5A -
Bandwidth @ ±3dB @8Ω 20Hz - 22KHz

PO = 2X20W, MAX98400A,
PVDD = 12V ,RL = 8Ω

- 90% -

Minimum Load Impedance




Switching Frequency


265KHZ 330KHZ 295KHZ
Gain   9dB 20.1dB 29.8dB

Input Sensitivity(RMS)


- 620mV -

Input Impedance

- - 22KΩ -

Output Power

Stereo,RL = 8Ω,THD+N 10%

- 22W -

Mono, RL = 4Ω,THD+N 10%

- 44W -


POUT=0.1W to POUT/2, fIN= 20Hz to 20kHz, RL= 8Ω




POUT/2, fIN=1kHz, RL= 8Ω






  • Size: 9.1cm x 5.0cm
  • Bluetooth 4.0
  • Bluetooth audio volume control port (BVC)
  • Working voltage: DC 10V-24V
  • Thermal and output current protection


  • Personal computer
  • Background music system
  • Musical instrument amplifiers
  • Home DIY
  • Car audio


  • All the order are shipped within 2 business days. 
  • Products are either shipped from China or Australia. Item locations are mentioned on the product page.
  • Customers will receive tracking code if they have selected the 'shipping method with a tracking code'.
  • Returns are accepted if the customers return the items within 1 month to our address in Australia. If the item has been shipped from China, the customer still has to return the item to Australia. 
  • Return post fees have to be paid by customers. If the product is defective, we will pay the shipping fees.


Shipping fees for Australian addresses(Item Location: Australia):

  • Standard Post- using Australia Post: US $5.95 ~ AU $9.00 
  • Express Post: US $9.95 ~ AU $15.00


Shipping fees for international addresses (Item Location: Australia):

  • Standard Post with tracking code: US $17.50 ~ AU $26.50
  • Express Post with tracking code: US $36.50 ~ AU $55.00


Shipping fees for Australian and international addresses:(Item location: China):

  • Registered post with a tracking code: US $3.95 ~ AU $6.00 
  • Express Post with tracking code: US $25.00 ~ AU $38.00 


How long does it take to reach the USA, UK, Germany, Australia Canada and other EU countries?  

From China: If we ship from China, the delivery time can be from 7 working days to 15 working days. See the proof on the images below. US based orders are delivered more quickly than other countries.

Most of the USA, UK, Canada, Australia, and Germany  based orders are delivered within 7 days. However, because of customs related processes, it can sometimes take up to 15 days.  Check out all the shipment proof images on this page. 


From Australia: If you have chosen standard post, you will receive your parcel in 3-5 days (in Australia) and 5-7 days (outside Australia)

If you have chosen economy post, you will receive your parcel in 3-5 days (in Australia) and 15-25 days (outside Australia)


What is the proof that we really ship and they are delivered ?

 Check out all the shipment proof images on this page. 


Where do we ship from ? 

We ship our products from Australia and China depending upon what you purchase. BuildCircuit's original products are shipped from Australia. 

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