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.
- 1 x NJM2073D Stereo Amplifier IC.
- 1 x 8 Pin IC Holder.
- 2 x 10K Resistors.
- 2 x 4.7R Resistors.
- 2 x 100K Resistors.
- 2 x Ceramic Capacitor, 50V, 100nF.
- 2 x Electrolytic Capacitors, 16V, 470uF.
- 2 x Electrolytic Capacitors, 16V, 100uF.
- 1 x Electrolytic Capacitor, 16V, 10uF.
- 1 x Stereo Amp Cable.
- 1 x PP3 Battery Clip Lead (Heavy Duty).
- 2 x 8 Ohm 66mm Speakers.
- 1m Figure 8 Speaker Cable 2x (7x0.18mm).
- 1 x Stereo Amplifier PCB
- PCB Length: 58mm.
- PCB Width: 35mm.
- Either: 1 x Zinc Chloride PP3 Battery.
- Or: 1 x 12V Wall Power Unit and 1 x 2.1mm PCB Mount DC Socket.
- Soldering Iron.
- Wire Cutters.
- Wire Strippers.
- Click here to download the essential information.
- Click here to download the full teaching resources.
- Click here to download Autodesk files for this product.
- 3D CAD Files.
- Click here to find out more about Autodesk.
This product is also available in retail packaging making theman idealgift. Click here to view the retail version.
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.
This kit is designed and manufactured in the UK by Kitronik.
- PCB Length: 58mm.
- PCB Width: 35mm.
- PCB Component Count: 21.
- Voltage Nominal: 9V.
- Voltage Range: 2V - 15V.
- Standby Current: 7.5mA.
- Current Max at Nominal Voltage: 180mA.
Steve Fergusson, the Head of DT at Haywood Academy in Burslem Stoke on Trent, sent us some excellent examples of innovative student designs for Amplifier and Lamp cases. The cases were designed and made by GCSE and A Level Product Design students and display a high level of creativity in all of the Students involved.
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.
A student from Selston High School made this exquisite Arctic Monkeys Dock using a whole range of materials and manufacturing techniques.
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 examples sent in by James Ratcliffe at the Milton Abbey School in Dorset.
MP3 Stereo Amplifier Kit by A Level Product Design students at Barry Comprehensive School.
Stereo Amplifiers by AS Level students at Richmond upon Thames College.
A range of Stereo Amplifier designs by year 10 students at Meadows Community School, Chesterfield.
Stereo Amplifiers designed by 6th form students as part of their A Level Product Design course at Audenshaw School.
A video of us comparing our Amplifier Kits taken from our Ask Kitronik Live event 2012.
can you use an old mobile phone charge lead as the power supply to the mains?
Posted byon Thursday, 30 June 2016
An old mobile phone charger with a mini / micro USB connector will output 5V and probably is good for over an amp of power which is far more than the amplifier will use. Other mobile phones are likely to be a similar voltage, but I’d recommend checking the voltage printed on the back of them. It needs to be within the operating voltage of the amplifier circuit which is 2V to 15V. You will need to work out which wire is the 0V and which is the positive using a multimeter and connect them the right way around.
Please note the higher the voltage you run the amplifier on (up to the limit of 15V) the louder you will be able to turn the volume without it distorting.
Also if you don’t mind spending a bit more money, we do a better amplifier that comes with an on board micro USB connector that may be compatible with your old phone charger.
Hello. Is this amp's input sensitive enough to work from condenser microphone output?
Posted byon Monday, 6 June 2016
The amplifier would amplify the signal from the condenser microphone, however it is difficult to say how loud this would be. It would depend a lot of the circuity and the microphone you have.
Hi there, The sound is very fuzzy and varies hugely depending on how you hold it. What could this be? Thanks
Posted byon 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
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 byon 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.
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 byon 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
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