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555 Timer Astable (Tone Generator) Kit

Exclusive to Kitronik
Teaching Notes
Key Stage 3/4
The 555 Timer Astable (Tone Generator) Kit produces a square wave output. The frequency of which is adjustable via the variable resistor.

Availability: In Stock.

Code1+ 5+ 50+
(£3.744 incl VAT)
(£2.52 incl VAT)
(£2.16 incl VAT)

This kit is perfect for GCSE students needing to use a 555 timer in its astable mode, where it produces a square wave output. The frequency of which is adjustable via the variable resistor. The board has a choice of two outputs. The logic output can be used to drive another IC or a speaker can be connected so the tone is heard (e.g. a door bell).

The push button switch connects to the reset line such that the IC is only active when the button is pressed.


  • The 555 Timer Astable (Tone Generator) Kit produces a square wave output.
  • The frequency of the aquare wave is adjustable via the variable resistor.



  • PCB Length: 40mm.
  • PCB Width: 40mm.




  • This kit requires soldering.
  • Requires x 3 x AA Batteries. and depending upon desired use a speaker, both available separately.

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 2117.
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.

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Posted by Stephen, Wednesday, 9 March 2016 on product 555 Timer Astable (Tone Generator) Kit


Do you sell just the PCB for the astable circuit? We have components for our version but are finding a few students are having difficulty soldering stripboard.


  • Posted by Michael Lockhart on Wednesday, 9 March 2016

    Yes we do stock the PCB for this circuit, however it is only available in quantity’s larger than 10.

Posted by Gary , Thursday, 15 October 2015 on product 555 Timer Astable (Tone Generator) Kit


A few questions, I was wondering whether the button could be substituted for a flick switch, whether a LED could be introduced to show when the wave is active, and finally whether the sound output could be an XLR? Thank you.


  • Posted by Michael Lockhart on Thursday, 15 October 2015

    It is possible to change the switch in the circuit, and also add an LED to show when the circuit is switched on. You would need to add the LED after the switch with a suitability rated resistor before the LED. The kit gives a single ended output so it would be quiet difficult to get this to output XLR.

Posted by Mario, Tuesday, 7 October 2014 on product 555 Timer Astable (Tone Generator) Kit


Hi, Is it possible to have sound only when there is resistance? for example, when the pot is zero - no sound - and when the pot increases - with sound -. That way I can play around with bare paint and staff like that. See below an interesting use to understand what I mean: Thanks, Mario


  • Posted by Geoff Hampson on Tuesday, 7 October 2014
    If you were to take the trimmer potentiometer out of the circuit and replace the two connections with something resistive live bare electric paint then it would be possible to change the tone or the note. Altough this kit has the right connections to the 555 timer IC, the capacitor on the board that makes the time constant with the trimmer pot wouldn't give a good tone with a much lower resistance such as the paint, so a different capacitor would be needed. In terms of not making any sound there is no option to change the volume of the circuit.
Posted by Richard, Wednesday, 23 April 2014 on product 555 Timer Astable (Tone Generator) Kit


can I use a version of this basic circuit to drive a relay in a-stable mode? How? Standard relays; coils can switch at anything 5v & up.


  • Posted by Aaron Sturman on Wednesday, 23 April 2014
    Yes you can use it to drive a relay. The board has a transistor driven output which can be used to connect to a relay.
Posted by Sathish, Tuesday, 20 August 2013 on product 555 Timer Astable (Tone Generator) Kit


Hi, Just a quick question. Can we connect a LED instead of a speaker? What will be the frequency of the LED blink? or for speaker tone, can we adjust the tone to lets say 50 Hz


  • Posted by Aaron Sturman on Tuesday, 20 August 2013
    Hi Sathish, With the resistor and capacitor combination in that board the minimum frequency you can produce is 4.2kHz. With the right capacitor and resistor values though you should be able to get just about any frequency. If you look at the build instructions for the product which are on this page it lists the formula so you can work out what values you need for any frequency you are after.

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