Function Generator Kit

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Quoting product code: N42FL


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About this product


  • Build your own kit to get you started with electronics
  • Microcontroller based function generator capable of producing square, sine, sawtooth or triangle waves
  • Adjustable frequency and wave shape by pressing the buttons on the unit

Product overview

• Build your own kit to get you started with electronics
• Microcontroller based function generator capable of producing square, sine, sawtooth or triangle waves
• Adjustable frequency and wave shape by pressing the buttons on the unit
• Attach a speaker of up to 1W to hear your sound waves

How does this kit work?
The function generator kit is designed to produce waveforms from a frequency of 1Hz to 39kHz. By connecting a 12V power supply and pressing the function button you will be able to change the wave type. By pressing the frequency button you will be able to go through the frequency range and listen to the different types of waves at different frequencies.

How difficult is this kit to put together?
This kit is for beginners due to the less complex nature of the components. It is a great tool for teaching children and the less technically advanced the basics of circuitry. It is advised that children are supervised when handling a soldering iron as these can be hot!

Rated 4 out of 5 by from I just purchased and built this kit and in my haste I soldered the main I.C straight to the board instead of the socket, I soon realised I'd made a mastake and though I'd ruined the kit. All seemed to work fine, I even soldered a mono jack to the output and played through headphones and a guitar amp. The bass tones are nice. Hopefully will use these parts to make a more complicated basic synth when I have the knowledge. As a starter/learner kit it would be nice if there was some info about basic electronics in the instructions so you had some kind of idea what the functions of all the parts do in this circuit. As it is it's just aload of parts that you solder to a board and then you have a sound generator once your done. A great first project.
Date published: 2014-11-11
Rated 5 out of 5 by from A nice little kit that allows you to test headphones and small speakers. It goes up to 39kHz for playing with ultrasonics too. The 1W amplified output is surprisingly loud. It demonstrates the use of an R2R ladder (schematic included) too. Should be easy enough for a novice to assemble. I'm very happy with it.
Date published: 2014-11-11
Rated 5 out of 5 by from It does produce decent wave forms I think a previous reviewer must have made a circuit error as I get very good looking sine, triangle and square waves. I put them through an oscilliscope and they look pretty good to me. The buttons for changing the frequency are a bit fiddly, but for what it is, I'm not going to mark it down for that. Used often to inject a signal into audio amps for fault finding.
Date published: 2015-12-21
Rated 1 out of 5 by from Sadly no use as a piece of test kit. I built one of these in order to use it with an oscilloscope. Unfortunately ALL the waveforms are distorted very badly, it can't even produce a pure sine wave. Sorry but this is not a useful piece of equipment and was a complete waste of money. Luckily I do have a decent signal generator but I was interested in this as it claims to produce sawtooth and triangle waveforms. It doesn't. Ok as a kids toy to make noises.
Date published: 2015-09-29
Rated 3 out of 5 by from Basic signal generator lacks features Reasonably straightforward to construct. Waveforms are reasonable. It would be useful for demonstrating eg. the range of frequencies of sound waves, but no good for more accurate work as the frequency steps are too big. A display of frequency would also be a big improvement.
Date published: 2017-07-12
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What are the dimensions of this product

Asked by: JosephChapmanWo
We have placed an order for the item and will reply once we have the info.
Answered by: Dominic
Date published: 2017-07-19

can you advise me where to start with trouble shooting the function generator kit, there is no response from the board,, from speaker, 0-5v output, or leds,,though there is good power around board according to multimeter ,around 11.5v thankyou

Asked by: karly
Sorry it would be impossible to give any kind of diagnostic information via this medium. This is a self assembly kit with each of the components and their respective locations clearly marked, if you believe you have assembled the unit exactly as required, and all solder joints are correct with no dry joints or over-spill then it should work. There always remains the possibility that the kit may be faulty in such an instance I would recommend the item is returned for exchange/refund.
Answered by: Les
Date published: 2017-05-08

with function generator kit ,recently bought,,but doesnt respond ,I notice that instruction booklet places IC3 LM386N-3 near volume potentiometer,and IC2 LM358 near phono output,,,but zooming in on photo on web site,, the poition of IC3 and IC2 are swap

Asked by: karly
I've built this kit myself, if you follow the instruction manual then all the components will be sited in the correct positions as the board has all the component numbers written on it to aid with assembly. I must admit mine didn't work first time as I had left a dry joint on one of the legs of C2 but once I spotted and rectified this it worked perfectly. Check your work, if you are convinced the item is faulty I would suggest returning for exchange or refund.
Answered by: Les
Date published: 2017-05-08

Is it possible to substitute a rheostat in place of the push buttons, to change the frequency? If so, can you suggest a part number?

Asked by: Jack
This service is for frequently asked questions and does not allow two way communication, In order for us to best assist you with your technical issue please contact us on the details below: 0333 400 9500 or email
Answered by: Billy
Date published: 2017-03-02

Is it possible to link this to a digital display to show the frequency being generated? If so, do Maplin sell something suitable?

Asked by: Jack
Unfortunately we are unable to guarantee full compatibility for this item in your intended application I am sorry for any inconvenience this may cause you.
Answered by: darren cordon
Date published: 2017-02-15

Will it run on a 9 volt battery?

Asked by: mikewsm
No this requires a 12V power supply.
Answered by: Billy
Date published: 2016-08-30

Can you send me the cicuit diagram for the function generator and if possible the code listing please.

Asked by: Woodmaker
This information is presented in the user guide/datasheet for the device, which can be found on the downloads tab of the product listing. However if you are using a mobile phone or tablet to view our website it may not be visible. To this end I have copied in a link to the electronic version of the instructions below for your convenience.
Answered by: Les
Date published: 2016-06-28

I know LED anode and cathode are identified by length of leads, but its not obvious which way round LEDS go on the board - does anode or cathode point to outer edge of board

Asked by: Jock
There should be a flat edge on the side of the LEDs that would line up with the LED symbol on the PCB board this would be the easiest way to line them up.
Answered by: Billy
Date published: 2016-03-22
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