With its low part count this easy build timer project makes a good introduction to electronics. The timer uses a resistor capacitor network to provide a time delay of between 1 second and 4 minutes, which is set by the PCB mount variable resistor. When the button is pressed the LED changes from red to green, then at the end of the time interval it turns red.
This product is also available in retail packaging making them an ideal gift. Click here to view the retail version.
- Easy build timer kit.
- When the time set has been reached the LED changes colour.
- The time delay can be adjusted via the variable resistor.
- 1 x 2AA Battery Cage.
- 1 x 47Ω Resistor.
- 2 x 10KΩ Resistors.
- 1 x 1MΩ Potentiometer.
- 1 x Capacitor, Electrolytic, 10V, 1 mF.
- 1 x BC558 PNP Transistor.
- 1 x Tri colour 5mm diffused LED - 650mCd.
- 1 x 6mm PCB Mount Tactile Switch 9.5mm Height.
- 1 x Easy Build Timer PCB
- PCB Length: 54mm.
- PCB Width: 26mm.
- 2 x AA batteries, available separately. Alternatively it can be powered by our easy build coin cell power board.
- Soldering Iron.
- Wire Cutters.
- This kit requires soldering.
- This product is also available in retail packaging making them an ideal gift. 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 2111.
Note: this service is only offered to schools for evaluation purposes only.
This kit is designed and manufactured in the UK by Kitronik.
|PCB LxW (mm):||54 x 26.|
|PCB Component Count:||11.|
|Voltage Nominal (V):||3.|
|Voltage Range (V):||2.4 - 3.5.|
|Standby Current (mA):||11.3.|
|Current max at Nominal Voltage (mA):||15.1.|
Toothbrush Timer designed by students at Meole Brace School.
Toothbrush Timers designed by year 7 students at Meole Brace School.
Easy Build Timer demo video.
Hello, I'm looking for a timer circuit that switches on an LED from a push-button, the LED then staying lit for an amount of time, then going out. In this circuit, if I removed Q3, and replaced the LED with a single colour one, would that work? Or do you sell parts for the circuit I'm looking for? Thanks, Douglas
Posted byon Wednesday, 7 October 2015
We sell a kit which has an adjustable timer which controls the length of time a number of LED’ (of your choice) will remain on for after a switch has been pressed. This is the LED picture frame kit, code 2146 https://www.kitronik.co.uk/2146-led-picture-frame-kit.html
Hi there, Is it possible to extend the max time to 15 minutes or so?
Posted byon Thursday, 12 February 2015
Yes this can be done you would need to change either R1 or R4, we however don’t do a large sized variable resistor than 1M. So the best option is to change R1 for a 2M2 and set R4 to 1M, which will then give you around 15 minutes.
Hi I want to place this into a small plastic box containing battery and circuit board, and want the LED to be mounted in the lid with the button or preferably a small toggle switch. Are you able to provide the boxes, and the toggle switch, and what changes to the circuit are needed to add the toggle switch. Do you do a mounting kit or can you provide a panel mounted LED. I want a total of 5 of these kits OR Can you provide a kit like the link below? many thanks Ferdy
Posted byon Friday, 12 October 2012Yes you can change the PCB mount switch for a panel mount switch, however if you are doing this be careful to connect to the right pads on the switch. The PCB mount tact switch has four legs and two or these are connected together both inside the switch and on the PCB. You only need to connect the switch to two pads, but make sure they are not the two pads that are joined together by a track. If you look under components you will find a section on switches, where there are a range of panel mount switches: https://www.kitronik.co.uk/products/components/switches-and-sensors/ The LED in this kit can be mounted using a panel mount clip see: https://www.kitronik.co.uk/products/components/leds/leds/led-spacers-and-holders/led-holder-pack-of-50/ Unfortunately we are not able to supply boxes or the anything similar to the kit you have linked.
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