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Relay Board

Exclusive to Kitronik
Teaching Notes
Key Stage 4
This board is configured by jumpers & trimmers to do a range of tasks. Sensor or switches can be connected to the input & the relay output has a timer option.

Availability: In Stock.

Code1+ 5+ 50+
(£6.996 incl VAT)
(£5.148 incl VAT)
(£4.788 incl VAT)

This is a versatile relay board kit that can easily be configured via jumpers and trimmer potentiometers to do a range of tasks.

Most sensor and switches can be connected to the input of the board and the trigger level set for the input device. This can be inverted if required, then there is the option to feed this straight to the relay or a timer of up to 25 minutes can be used. Irrespective of the state of the invert jumper whenever the sense LED goes from off to on the timer restarts.#

The board can run off any voltage from 4.5 to 6 volts.

The output cans switch DC or mains.

This datasheet details what the board does and how to use it along with some worked examples. A more detailed set of information including the build instructions & how to configure the kit can also be downloaded.

Click here to download the full teaching notes pdf_icon.gif

WARNING: Using mains electricity can be dangerous and should only be attempted by qualified people.

This kit includes:

  • 3 x 100Kohm resistors
  • 3 x 220ohm resistors
  • 1 x 47Kohm resistors
  • 1 x 1Mohmpotentiometer
  • 1 x 10Mohm potentiometer
  • 2 x 1N4001 diodes
  • 2 x 5mm red LEDs
  • 1 x 100uF capacitors, electrolytic
  • 1 x 4.7uF capacitors, electrolytic
  • 1 x 2N7000 n-channel FET
  • 2 x 2 way terminal blocks
  • 1 x 3 way terminal blocks
  • 1 x LM324 operational amplifier IC
  • 1 x 14 pin IC holder
  • 2 x 3 way pinstrip
  • 2 x Jumpers
  • 1 x Relay
  • 1 x Relay board PCB

PCB dimensions: 86.5mm x 49mm.

This kit is supplied as a pack of parts and requires soldering.

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 2144.
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.


Posted by Steve, Friday, 6 January 2017 on product Relay Board


My project has a live circuit (9v) powering a solenoid. I want to turn the solenoid off for 12 seconds after which time it automatically switches back on again. Is that 'delay off'? do you have a simple kit that would do that? Many thanks Steve


  • Posted by Michael Lockhart on Friday, 6 January 2017

    Hi Steve, Thank you for your patience while we looked into this. The relay board would be perfect for this job, though it might be a little fiddly to get exactly 12 seconds as it can do up to 30 minutes. The output relay has a common connection and then a normally open and a normally closed connections. If the normally closed connection is used (along with the common) connection this will be normally closed and go open circuit or off for the 12 second period. The solenoid circuit is simply 3 items, the 9V supply, the solenoid and the relay (common & normally closed connections). Any switch or sensor can then be connected to the input on the relay board to trigger the timer.

Posted by Malcolm Reynolds, Friday, 8 April 2016 on product Relay Board


I have solar panel on a motorhome unit and would like to use this relay to switch in a trickle charge to the engine start batteries once the leasure battery is charged up. To do this I want the relay to operate at 13.8 volts please can you advise how to modify the circuit to allow upto 14volts both as power supply and signal . I have tried the link on previous question i.e. 2144-relay-board.html but nothing was found. Thanks for help


  • Posted by Michael Lockhart on Friday, 8 April 2016

    To be able to switch at the required point you would need to use a micro controller to ensure you switch at the precise point and also an accurate way of measuring the battery charge level. Unfortunately we don’t stock any items which could be used to accurately measure the charge of the battery.

Posted by Graham, Thursday, 21 January 2016 on product Relay Board


Thanks for the prompt reply. Yes we had come to the same conclusion, but wondered if adding your timer kit No:2111 to the input of the relay board kit would give us a delay on. If so could you help us with the correct way to connect the two kits please? Graham


  • Posted by Michael Lockhart on Thursday, 21 January 2016

    The easiest way to do this would be to us a microcontroller. You would then program this to delay on for a period of time and then delay off for a period of time. The kit you mentioned couldn’t be used.

Posted by Graham, Thursday, 14 January 2016 on product Relay Board


Thanks for the prompt reply. I’m using the invert function and the time delay function. This gives me delay off. Is it possible to have a delay on and delay off? The block diagram, page 2 doesn’t give us this information. Graham


  • Posted by Michael Lockhart on Thursday, 14 January 2016

    Unfortunately you aren’t able to delay on then wait and delay off with this kit.

Posted by Graham, Wednesday, 13 January 2016 on product Relay Board


The relay kit gives me an adjustable delay off, is it possible to also have a delay on. Possible with another kit on the input? Graham


  • Posted by Michael Lockhart on Wednesday, 13 January 2016

    You would need to use the invert function on the relay board to do this. All the information for using the invert function can be found in the notes for the product, You would need to look at the block diagram, page 2, Using the relay information and drawing, page 3 and Testing the PCB, page 7.

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