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Thread: using a relay for a latching circuit

  1. 6th January 2024, 12:37 PM #11
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    Quote Originally Posted by POD View Post
    Thanks for that. A problem with that schematic though, unless I'm missing something, is that the only way to turn the heater off is to turn the ignition off. Still leaves me needing a 'normally closed' switch to break the coil circuit.
    ahh yeah, I forgot about the off bit its like a logic problem.
    that will be brain fart 2. This is why I dont do computer programming. I'll have another try.
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  2. 6th January 2024, 02:36 PM #12
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    here we go, tested in my head , works,

    push button for on, push again for off . you could add a pilot light across relay 5 coil so you know its on or off incase the boss says "I thought you turned seat warmer on"

    this is as simple as it gets with relays, if you want a single pushbotton for on / off.
    you will need 2 diodes. tbh much easier with transistors and more compact too .


    IMG20240106152724.jpg
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  3. 6th January 2024, 04:30 PM #13
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    It might take me a while to get my head around that!
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  4. 6th January 2024, 07:13 PM #14
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    Just put an ON/Off switch on ignition in feed,that will turn it off while ignition is on, if push button switch has been pushed.

    As for diodes,transistors,i don't know as we normally work on 240,415V,etc,and don't use them.
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  5. 6th January 2024, 07:48 PM #15
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    Quote Originally Posted by p38arover View Post
    Can you post an image that’s not squashed.


    Or not vertical, my eyes ARE horizontal not vertical.
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