555 Timer Kit

The 555 Module can be used as an LFO or a Tone Generator in a circuit of your choice. All parts included to make one circuit within minutes. No messing around.

To Order please visit: GetLoFi.com/shop

Assembly Video:


Included Diagram:



Make sure all the parts are included: 555 IC, Circuit Board, 500K Potentiometer, 1K Resistor, 1uF Capacitor, and wire.


Prepare the parts by bending the 555’s legs in half and cutting legs short on other components. The circuit board will need solder blobs to hold the components in place.

555_3.JPGMount the IC first, observing the Pin 1 with the Dot. It should go next to the GND symbol and look like so.


The resistor and the capacitor can now be mounted. Be sure that the capacitor – stripe is facing towards the edge of the board, next to the GND symbol. Resistor can be mounted however.


The potentiometer can be mounted on the circuit board or extended via two wires. Note that the center pin must be connected.


The power wires can now be connected. The board can be powered on a wide range of voltages from +3 volts to +30. However the output will be close to the input DC, in some cases a resistor will be required to lower the current or a switching NPN transistor for triggering a Ground Signal.


Finally the output wires can be connected. Main Squarewave output is located on Pin 3 of the IC directly to the left of the Positive Voltage wire. There is also a very low Triangle wave output on Pin 2.

Example Circuits will be posted soon.

User Demos:

[youtube]http://www.youtube.com/watch?v=Dxdlnt9qJPI[/youtube] [youtube]http://www.youtube.com/watch?v=aUtkFGrv4dQ[/youtube]

53 thoughts on “555 Timer Kit”

  1. Yes, Pin 4. There is a spot on the circuit board for that. 0-1 Volts will control the frequency.

  2. Sure, the capacitor value only effects the Frequency range. Oscillator will operate reguardless of value.

  3. What exactly do you mean by “very low triangle output? Low as in volume or low as in frequency range? I want a triangle wave oscillator so bad it’s not funny.

  4. Is it possible to change the waveform of the oscillation? If so, what would I need to build and where would I need to attach it?

  5. If i want to use this timer to sweep a DC motor in opposite direction once every hour how should i go about this.
    Do have all the kits such as tthe pcb ready for anyone who wants to try it.

  6. If i want to use this timer to sweep a DC motor in opposite direction once every hour how should i go about this.
    Do have all the kits such as tthe pcb ready for anyone who wants to try it.
    Is this timer monostable,bistable or astable?

  7. trying to put a 555 in a speak, having some loud speaker buzzing issues… i’ve used this same built kit in a couple other toys, this didn’t happen with those…


  8. Not really sure about the Speak and *. Probably will have to test by connecting the power to the Module and using the output wire to probe around the Speak circuit until you find something interesting.

  9. What are you hoping to achieve by connecting this to an SK-1? Pitch modulations? Other Glitches?

    This will not work for pitch, please use the LTC Precision Clock kit instead. Otherwise you can try powering the Timer circuit from the SK-1 board and then taking the output wire and probing around it on the 3 ROM ICs that normally create glitches.

    This is untested so you may cause something to “glitch out” permanently.

  10. thanks for your description and quick answers CM! you say the capacitor effects the frequency range, as in how slow and fast the oscillator pulses? which part’s value should be changed to modify the amplitude of the pulse? thanks!

  11. I need some sort of oscillator that will close a circuit and that i can change the speed of this circuit closing via a pot. Can this, or any other kits you have do this? if not, where can i find some sort of device. thanks.

  12. Yes this can do that. What you also need is something like a Relay to make the electrical connection, while keeping the 2 circuits Isolated from each other. If that is not necessary you can just power your Target circuit with this Oscillator.

  13. Hey where can I hang an LED on this circuit so that it blinks with each tick of the clock? Would I need to add a transistor? thanks

  14. Hey Brian,

    If you connect the Ground of the LED to the Ground on the circuit board and then the output of the 555, Pad 3 to the Positive of the LED via a 100-1K resistor, it should pulsate just fine. A transistor would be better because there would be no Voltage Drop, clean switching.

  15. Hi thanks. Yes that works quite nicely. Blinky lights make everything better. One more question. With the stock components the clock runs a bit too fast for me. I’d like the slowest setting to be maybe twice as slow. The fast end is fine, though I won’t be using it at audio rate it’s okay (it’s going to clock my modular synth). What should I experiment with to modify the slow speed? A different resistor? Maybe a different size pot?
    Lastly, I ran a CV wire to pin 5 but the control is really erratic. Any guidance there?
    Great kit. I’ll likely order a couple more. thanks.

  16. Try a bigger capacitor, that will improve the range. Pin 5 input is not my favorite either. You can just send the CV to the Potentiometer that controls the rate.

  17. Great job on creating a simple and effective LFO!! I’ve built a few of these, controlling each other and other audio circuits. It really helps to tie pins 1 & 8 together with a small value (something like 10nF) which will stop the LFO circuit creating unwanted disturbance in the CV target circuit…

  18. The smaller the capacitor value the higher the frequencies.

    So 1uF will sound lower than 0.1uF capacitor. Also you can adjust the 1K resistor and the 500K potentiometer with different values to modify the range.

  19. Dear Circuitmaster,

    Very impressed with your patience in responding to everyone; I couldn’t resist asking a question. I just bought a Drone Lab (by Casper Electronics). If you’re unfamiliar with it, it’s a 4 osc drone synth. My only “complaint” with it is that there is no LFO to play with. Could I safely wire one of these 555’s to my Drone Lab? If possible, I’d probably just put it on the pitch of one of the 4 VCOs, or maybe the who mixed output signal…

    Thanks for any advice you might have!

  20. Well I am sure that it can be done, however you would have to look at the schematic and determine where to inject the LFO signal from the 555. Unfortunately I do not have a Dronelab, but if you wanted to email me perhaps I could modify it for you.

  21. Will this work with 20 leds. I would like them all to fade in and out very slowly. The leds will be running off 12volts, with a voltage drop of 3.4 at 20 amps.

  22. No it will not. You need a PWN controller to make the Fade in and Out effects. Try searching around on Google and LED places. Also a DMX controller may do what you need.

  23. Thanks CM,

    Its just I’ve seen it done on you tube with a 555 timer and a pot, but I didn’t want to make one was looking for a kit to make it easier than finding parts. If you no of any place to find a kit it will be much appreciated.

  24. would you say it’s possible to take this kit build it into a small enclosure and essentially make a mini lfo unit with input (to pin 4?)/output (from pin 3?) jacks and then you could use it with whatever you wanted? A guitar, feedback loop, whatever . . .

    is it possible to easily get ramp or sawtooth-ish waves out of a 555? I read something about connecting the thresh and trig together?

    Thanks for any help

  25. I know someone will laugh at me for not knowing this but I’m planning on buying one regardless I’m just unsure on where the low ramp and square output attach inside of toys.?

  26. hey there and thanks for the sweet kit 🙂

    First time builder here.. I have built the kit just as ordered but i have put a larger cap 16v – 470uf for a lower pitch..
    I have the output to a 1/4inch jack to my head phones and i am getting a nice pulsating pitch but when i turn the Potentiometer i only changes ever so slightly.. was wondering if there is a way to get larger changes, like to be able to lower and raise pitch or pulse?
    Sorry in advance if its a novice question but first time i have tried electronics.

  27. Any clues on where to inject the signal from the 555
    On a Yamaha pss-170? Having trouble so far. Any help would be greatly appreciated thanx

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