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    Any electronic experts out there?

    This might be the wong place to ask, but I'm after buying some sort of electronics switch.



    I need an electronic relay / switch whereby when it receives an electrical current it completes a circuit for a very short time.



    I'm sure that sounds more complicated than it actually is, and I know they exist as I have one in another device!



    Can anyone tell me the name of such an item?

    9 Comments

    There's a lot of clever people on here so i'm confident someone will answer this positively for you but i think there's only about 6 or 7 of us online at the minute so check back later :thumbsup:

    Original Poster

    Yeah hopefully, what sort of person in their right mind would be on here at this time in the morning?!

    meispete;3815999

    Yeah hopefully, what sort of person in their right mind would be on here … Yeah hopefully, what sort of person in their right mind would be on here at this time in the morning?!



    me :w00t:

    i cant sleep & you cant make me
    :santa:

    Hi,

    If you can supply the following infomation I might be able to help.

    1) What voltage are you using for the signal?
    2) What voltage do you want to switch?
    3) How long do you want the switched voltage to be on for?
    4) What are you switching on (curent to be switched)?

    There are a lot of timers that will do the job for you without having to build an actual circuit, for exdample:

    uk.rs-online.com/web…025

    pdf here: docs-europe.electrocomponents.com/web…pdf

    Hope this helps,

    NV

    good advice :thumbsup:

    unless he was after an electronic time for size/pcb etc, but good advice all the same :thumbsup:

    jbarnett;3816509

    The component that you're after is called a relay.



    while the OP is a lil ' vague...

    he does say for a short time... which sugests the timer would be more suitable:thinking:

    saying this using either when you don't know what they are called seems a lil' odd hehe

    Original Poster

    Sorry I was vague, I'm just messing around trying to make a wireless momentary switch. In the shed I've found an ok wireless doorbell which seems a good starter. The doorbell speaker is broken but there is an led which lights up for 10 seconds but this is too long. Obviously current for the led is minimal and there is no mains elec involved. I'm hoping to find a relay to switch when the led is powered, which will complete a circuit but only for a second or so, thus making a wireless momentary switch of sorts.
    Hope that makes some sort of sense!
    Pete

    Original Poster

    IWANTBLUE;3816641

    while the OP is a lil ' vague...he does say for a short time... which … while the OP is a lil ' vague...he does say for a short time... which sugests the timer would be more suitable:thinking:saying this using either when you don't know what they are called seems a lil' odd hehe



    Sorry, it was the specific name I was looking for. Someone has suggested a constant-to-momentary (CTM) relay, which sounds about right?

    Unfortunately it seems you cant just buy them off the shelf though

    I've not done electronics since GCSE but dont mind turning my hand to anything.

    I think your best bet would be t have a read -up @ ]http//ww…com

    Its a pretty good source for simple cct.s and will show you all of the things you need for this project

    seeing as you'll only have a 1.8-2V supply most likely you'll be better off using a transistor to switch the 12v or whatever rating relay you need for what youre switching..

    either way have a butchers on that site and it will put you on the right track
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