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.
Hi Jonathan, It depends really on how confident you are at soldering. If you are experienced it should only take around 5-10 minutes. If you are new at soldering it may take slightly longer maybe 20 minutes to get it fully soldered and working.Posted byon Wednesday, 8 March 2017
Hi Ben, Yes it would be fine to connect mains power to it, the resource provides details on how this could be done https://www.kitronik.co.uk/blog/how-to-connect-a-psu-to-your-mono-amp-kitPosted byon Friday, 13 January 2017
Hi Dillon, 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 you 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.Posted byon Tuesday, 13 December 2016
Hi Maddie, Again as per my previous answer this amplifier kit hasn't got the circuity built in to allow it to charge either a phone, IPod or MP3 player. Sorry.Posted byon Monday, 12 December 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.
MichaelPosted byon Thursday, 30 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.Posted byon Monday, 6 June 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.pdfPosted byon Thursday, 3 March 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 byon Tuesday, 23 February 2016
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.pdfPosted byon Monday, 20 April 2015
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 byon Tuesday, 18 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.Posted byon Wednesday, 12 November 2014
0voteA: It's pretty loud at full volume!Posted byon Wednesday, 22 October 2014
0voteA: Two enclosures would be fine, if the PCB is going to be in one of the enclosure though it's probably worth deciding which one it will go in before you cut the speaker wire. That way you can cut one short speaker wire and have a longer one for the second enclosure.Posted byon Monday, 13 October 2014
0voteA: Hi, the IC is pre-programmed. Just plug it in and it will work.Posted byon Thursday, 31 July 2014
0voteA: Hi, it is possible but you might not need a pre-amp depending on what your signal source is. Can I ask what you are using it for?Posted byon Tuesday, 27 May 2014
0voteA: We have tried this kit with an iPod and whilst it does work there is no volume control on the iPod or on the amplifier kit so you get the music played at full volume which is inevitable distorted. I suspect that an iPhone will be the same as the iPod, but haven't tried this. It would be possible to use two potentiometers to create a volume (and balance control). The speakers could be changed however the IC on the board will only drive 1W into each speaker so you wouldn't necessarily hear the benefit of using better speakers.Posted byon Friday, 11 April 2014
0voteA: The boombox is available separately. There is a link in the related items on the left of this page. You can also see some pictures of how schools have boxed the mono amplifier using other materials by clicking on the camera icon. We often find that if schools are short on time and want to focus on the electronics then they will use the boombox which can easily be personalised. If more time is available then students will be able to make their own enclosure, in this case it is often useful to have some boomboxes to hand as there will often be the odd student that hasn't managed to finish their case and still will get to take away a finished product.Posted byon Friday, 11 April 2014
0voteA: We have tried this kit with an iPod and whilst it does work there is no volume control on the iPod or on the amplifier kit so you get the music played at full volume which is inevitable distorted. I suspect that an iPhone will be the same (unless it has a 3.5mm jack) as the iPod, but haven't tried this. It would be possible to use two potentiometers to create a volume (and balance control). The speakers could be changed however the IC on the board will only drive 1W into each speaker so you wouldn't necessarily hear the benefit of using better speakers.Posted byon Friday, 11 April 2014
0voteA: We do a deluxe version of the stereo amplifier which includes a volume control, power LED, on/ off switch and optional DC jack plug, for product details see: https://www.kitronik.co.uk/products/project-kits/ic-based-kits/deluxe-stereo-audio-amplifier-kit/Posted byon Friday, 25 January 2013
0voteA: Yes you can add an LED, there is an explanation of how to do this on the following page: https://www.kitronik.co.uk/resources/tutorials/how-to-add-a-power-switch-and-led-to-your-project-kit/Posted byon Wednesday, 12 December 2012
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