555 Monostable Switch Kit

Price match guranteePrice match guarantee

We can price match this item if found elsewhere. Call us on:

0333 400 9500

Quoting product code: N32FL


Our delivery options

Free standard delivery (orders over £10)
3-5 working days 9am-5pm
Standard delivery (orders under £10)
3-5 working days 9am-5pm
Next day delivery
Mon - Fri, order by 6pm
From £5.99
Specific day/time delivery
Choose am / pm OR before 9am / 10.30am
From £5.99

Specific options for this product are available in the checkout. Read more delivery information

About this product


  • Provides a timed output pulse when triggered
  • Trigger and reset inputs
  • Pulse duration adjustable from approximately 1 second to over 15 minutes

Product overview

• Provides a timed output pulse when triggered• Trigger and reset inputs• Pulse duration adjustable from approximately 1 second to over 15 minutes• Single pole changeover relay rated at 24V 10A (not suitable for direct switching of mains voltages)• Requires a 12V power supply

Rated 5 out of 5 by from I needed a 12v cct that would give me a 5 second delay when triggered. This does it admirably! Easily built in a few minutes and works as it should. I had to modify mine however as I needed the on board relay to be inactive until triggered. It comes the other way round. Relay is energised until triggered. Not a problem if you're powering it with a mains adaptor or similar, but mine was to be used in a car so the extra current drain was not desirable. With a couple of pcb track cuts and a bit of careful soldering, it can be made to energise on trigger by taking the relay coil to ground instead of Vcc. You have to turn round the protection diode as well. (make it source the load current, not sink it) A well made little pcb kit.
Date published: 2013-09-25
Rated 5 out of 5 by from nice timer Used this kit as I could not be bothered to build a 555 circuit myself on stripboard, although that would work out cheaper. The only modification I made involved triggering the unit via a dpdt 240v relay as I wanted to connect it to the pir that controls the mains fan in the bathroom, to turn the lights on. I used the second pole of the trigger relay to short out the timing capacitor (C1). In this configuration, any timing pulses are reset when the pir triggers. This keeps the lights on longer than the timing period if the pir detects movement. Connecting the unit like this avoids the lights going on and off at timed intervals, like they do in the back garden.
Date published: 2014-08-17
Rated 5 out of 5 by from simple circuit just what i needed. I needed a 12 volt vcc that would give me a instant supply when triggered delay off after 30 seconds, This does it great! Easily built in a few minutes and works as it should. I had to modify mine however as I needed the on board relay to be inactive until triggered. It comes the other way round.
Date published: 2015-05-31
Rated 5 out of 5 by from Great little curcuit A great little circuit. Connected it to a door bell as part of my home made door bell project. However, I also need to modify this circuit to only activate the relay upon triggering. The suggestion above didn't work for me, does anyone have a more detailed explanation how to modify this circuit to keep the relay idle until triggered?
Date published: 2014-07-21
Rated 2 out of 5 by from Normally on - not normally off The kit turns the relay on as soon as it is powered up and the timer when activated turns the relay off. If you have no concerned about power consumption then this is fine as there is a choice of No or NC terminals. If you are concerened about power consumption then you will need something else.
Date published: 2017-07-12
  • y_2018, m_2, d_20, h_2
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.7
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_5
  • loc_en_GB, sid_N32FL, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_maplin-en_gb

How much power does thing consume when in standby?.

Asked by: Phill
Unfortuently this is not specified
Answered by: Billy
Date published: 2017-09-20

I want to use this as a timer for aftermarket car radio when ignition is off. How much will it drain battery when connected permanently?

Asked by: Wolf2000
As much as we would love to be able to help here, we cannot offer design project advice or assistance
Answered by: Billy
Date published: 2017-04-10

I'm surprised that the product details don't include dimensions of the board. Neither does the datasheet.  Can you please tell me board dimensions and mounting hole sizes and distance between centres?  Thanks.

Asked by: DesperateMan
In order to answer your question, we need to order the item in to take accurate measurements. Once we have the required information we will update this response.
Answered by: Gareth
Date published: 2016-12-31

I assume this is similar to velleman univesal timer in that when a switch is depressed power is supplied for the duration you set and then switchs off, and that you only requiring buying a switch to trigger the timer?

Asked by: mikenc101
Full details of the operation of the device as well as a circuit diagram is provided via the electronic documentation under the downloads tab ... https://maplindownloads.s3-eu-west-1.amazonaws.com/n32fldatasheet-5589.pdf
Answered by: Les
Date published: 2016-12-13

This monostable circuit  light stas on how can I get this to flash. 

Asked by: Bang Bang
Unfortunately i am sorry but the item in question doesn't support use in you intended application.
Answered by: Darren
Date published: 2016-09-30

In its static state is the relay energised or not energised?

Asked by: Richard1212
This would be non energised while static.
Answered by: Russell
Date published: 2016-08-09

if i connect the trigger input to gnd permanently does the timer start when supply power is connected and then energise the relay after the set time?. i.e. i want to use it as a power on delay.

Asked by: neil
hi figured this out for myself, adding a capacitor (47 microfarad) between trigger and gnd holds the trigger below threshold while powering up and starts the timer immediately, adjusting tine using pot. replace pot with lower value (50k) for more accurate setting of short time periods. use the monostable not the astable
Answered by: neil
Date published: 2016-08-23

Can I use this to provide a 30second pulse to drive a slave clock ,the voltage to operate the clock would be 12 volt .

Asked by: Clock 10
As much as we would love to be able to help here, as Technical Support Advisors we cannot offer design project advice or assistance, we are more than happy to locate products and support you with your purchases but we are not able to design entire circuits or projects for you.
Answered by: Dominic
Date published: 2016-06-21
  • y_2018, m_2, d_20, h_2CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.7
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_22
  • loc_en_GB, sid_N32FL, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_maplin-en_gb