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  1. #11
    Quote Originally Posted by A_Camera View Post
    ...but 12V 6.5W is over 500mA, so if he is going to use the solenoid on the picture he needs a transistor, or a small relay in between the valve and the 555. The 555 is OK for small relays but not for solenoids.
    I did not mention a solenoid
    Albert Einstein may have been a genius, but his brother Frank, was a monster

    Sent from my clunky old Windows 7 Machine

  2. #12
    Wal's Avatar
    Lives in Stockport, United Kingdom. Last Activity: 3 Days Ago Has been a member for 6-7 years. Has a total post count of 341. Received thanks 37 times, giving thanks to others 13 times.
    Right, got this made now. It's flung together into an empty air-rifle pellet tin I had lying about, but it seems to work alright...

    I eventually used this circuit.

    ...you can get essentially the same thing for half the price here - I assumed at the higher price that this was pre-soldered - it wasn't..! The two pots that control the interval/pulse are a bit sensitive, but otherwise it's a decent enough kit and very easy to put together. I didn't need the fly-back diode after all.

    Thanks to Clive for suggesting the switch to over-ride the circuit and keep the air on continuously - useful and pretty much a necessity..!

    Here's a vid of it in action:



    And for fellow electronics dunces, here's a diagram of how it went together:

    Click image for larger version. 

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    Wal.
    Last edited by Wal; 13-05-2017 at 02:06 PM.

  3. #13
    Glad you have it fixed up and running Wal. Have you put a grommet around the red/black wires out of the tin ? to stop chaffing.
    ..Clive
    The more you know, The better you know, How little you know

  4. #14
    Wal's Avatar
    Lives in Stockport, United Kingdom. Last Activity: 3 Days Ago Has been a member for 6-7 years. Has a total post count of 341. Received thanks 37 times, giving thanks to others 13 times.
    Hi Clive, I didn't have any grommets to hand, so I've hot glued (around the holes) all wires going in/out... stops 'em moving about.

    Wal.

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