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Stereo Amplifier

Product Code: 2136
Exclusive to Kitronik
Teaching Notes
Key Stage 3
The Stereo Audio Amplifier Kit can be used with any Personal Stereo Equipment. Output power: 1W per channel. Supplied with 2 speakers and a pre-made Jack Lead.

Availability: In Stock.

Excl. VAT: $7.324 Incl. VAT: $8.789
  • Buy 5 for $5.566 ($6.679 incl. VAT) each and save 24%
  • Buy 50 for $4.98 ($5.976 incl. VAT) each and save 32%

This stereo audio amplifier kit can be used with any personal stereo equipment, including MP3 players.

It uses a NJM2073D audio amplifier IC which can output 1W per channel. The kit is supplied with two speakers and a pre-made 3.5mm jack plug.

It works nicely off a 9V battery (not supplied) or if you want to run it of the mains why not try our 12V wall power unit.


  • 1W per channel stereo amplifier.



  • PCB Length: 58mm.
  • PCB Width: 35mm.



This product is also available in retail packaging making theman idealgift. Click here to view the retail version.

Free samples:

Teachers can order a sample of this kit (one per school) here. You will need to select the kit from a list of all the sample kits; the stock code for this kit is 2136.
Note: this service is only offered to schools for evaluation purposes only.

Buy British:

 This kit is designed and manufactured in the UK by Kitronik.

Physical characteristics:

  • PCB Length: 58mm.
  • PCB Width: 35mm.
  • PCB Component Count: 21.

Electrical characteristics:

  • Voltage Nominal: 9V.
  • Voltage Range: 2V - 15V.
  • Standby Current: 7.5mA.
  • Current Max at Nominal Voltage: 180mA.
Stereo Amplifier Designs From The James Hornsby School
Steve Tucker the Faculty leader for Design and Technology at The James Hornsby School in Basildon in Essex sent us these fantastic images of student stereo amplifier designs.
Arctic Monkeys Dock – Selston High School
A student from Selston High School made this exquisite Arctic Monkeys Dock using a whole range of materials and manufacturing techniques.
MP3 Docking Station6_square
MP3 Docking Stations – Northfield School
Northfield School's D&T Department (@Northfield_DT) have shared these MP3 docking stations with us on Twitter. End of year assessments - DONE - great work!
Stereo Amplifier Kit – Milton Abbey School
Stereo Amplifier Kit examples sent in by James Ratcliffe at the Milton Abbey School in Dorset.
Gallery Stereo Amplifier – Barry Comprehensive School
MP3 Stereo Amplifier Kit by A Level Product Design students at Barry Comprehensive School.
Gallery Stereo Amplifier – Richmond College
Stereo Amplifiers by AS Level students at Richmond upon Thames College.
Gallery Stereo Amplifiers – Meadows Community School
A range of Stereo Amplifier designs by year 10 students at Meadows Community School, Chesterfield.
Gallery Stereo Amplifiers – Audenshaw School
Stereo Amplifiers designed by 6th form students as part of their A Level Product Design course at Audenshaw School.
Ask Kitronik Amp comparison
Video A Comparison Of Our Amplifier Kits
A video of us comparing our Amplifier Kits taken from our Ask Kitronik Live event 2012.
IMG_9253 (Copy)
Amplifier/Speaker Case 3D Printing Resources
This resource has been designed to show how you can use our Mono and stereo amplifier module kits as the basis for a 3D printing project.


Posted by lesley, Thursday, 3 March 2016 on product Stereo Amplifier


Hi there, The sound is very fuzzy and varies hugely depending on how you hold it. What could this be? Thanks


  • Posted by Michael Lockhart on Thursday, 3 March 2016

    There could be a couple of reasons why the sound is distorted and varies in quality at different volumes. It could be a dry joint on the speakers or the cable hasn’t been soldered to the speaker. There are a few possible reason which can be viewed in the fault finding flow chart, found within this link on page 5, https://www.kitronik.co.uk/pdf/2136_stereo_amplifier_essentials_2_0.pdf

Posted by lesley, Tuesday, 23 February 2016 on product Stereo Amplifier


The first instruction in the book says to 'place' the resistors. I'm assuming that you then solder them down, but I just thought I'd ask before I went ahead and did it! Thanks!


  • Posted by Michael Lockhart on Tuesday, 23 February 2016

    Hi Lesley, Yes we would recommend soldering the each component in as you go through the build instruction. This will ensure that you don’t miss any joints as you build the kit.

Posted by Caroline, Monday, 20 April 2015 on product Stereo Amplifier


Hi I have both V1 and V2 stereo speakers, and need to know whether the IC's are interchangeable. Also do you have a faultfinder for the V1 as the V2 is the only one I can find on your website. Thanks


  • Posted by Michael Lockhart on Monday, 20 April 2015

    Hi Caroline, Firstly the IC for version 1 can’t be used in version 2 and vice-versa. For version 1 you need the TBA820M Audio Amplifier IC and for version 2 you need LM386 Pre-amplifier. Fault finding for version one can be found via the pre-built version 1 model which is still on the website, code 2115B, or by following this link https://www.kitronik.co.uk/pdf/2115_mono_amp_essentials_2_1.pdf

Posted by Annie Shaw, Tuesday, 18 November 2014 on product Stereo Amplifier


Hi, Is this kit louder than the mono kit with an added speaker? I have a lot of the mono kits but want two speakers instead of one. Also, can a volume control be added?


  • Posted by Aaron Sturman on Tuesday, 18 November 2014

    This kit is louder than the mono kit with 2 speakers. Adding a second speaker does very little for increasing the volume with the mono amplifier chip as the power output is limited by the chip it uses.

    This kit uses a more powerful chip that is designed to drive two seperate speakers You can add a volume control system by using a dual swipe potentiometer and connecting one side to the source input signal, the other side to ground and the middle to the input on the PCB. If yo are not sure how to do this or want a neater way of doing it the Deluxe Stereo Amplifier includes a volume knob which saves you this hassle. 

    Alternatively if you want a really nice sounding set of speakers with even more power you may want to take a look at the 3W Amplifier, it has a volume knob, a high quality pair of Visaton speakers and can be run from 3xAA batteries or a 5V power supply (you can use an old mobile phone charger and plug it straight into the micro-usb socket on the PCB!).

Posted by Stephen, Wednesday, 12 November 2014 on product Stereo Amplifier


Hello, Is it possible to power the 2136 stereo amp project kit using a usb power supply cable like the one used in the USB colour changing lamp kit? Thanks, Stephen


  • Posted by Aaron Sturman on Wednesday, 12 November 2014

    Hi, it is possible but you won't get the best performance out of the kit at that voltage. It should be okay up to a moderate volume but you might experience clipping and distortion at full volume. 

    The more powerful 3W Stereo kit works very well from the 5V that the usb power supply cable provides. It also has a built in micro-usb socket so you can use a USB to Micro USB cable without any soldering if you wish.

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