Using transistors as toggle switch

Discussion in 'Homework Help' started by Jomil, Jan 10, 2013.

  1. Jomil

    Thread Starter New Member

    Jan 9, 2013
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    0
    Hey there,
    I have just signed up to this and would like to get some input for a project I am working on.

    I am trying to using a remote push button switch with a relay on circuit board. But the problem is when you press button on remote the relay operates, but when you release button relay shuts off. I need a simple circuit that will operate like a toggle switch:
    Press botton fisrt time on - circuit turns on.
    Press botton second time on - circuit turns off.

    I have been searching on line and have tried several ideas from schematics.
    I have in possession many 2N3904 and 2N3906 transistors. I would like to use them if possible. I have tried using schematic from hack of the week, but this doesn't work. I know it is a simple circuit I can use but I am having problems. Please let me know if anyone can help. I would appreciate it.
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,751
    4,799
    Have you considered using a push-on/push-off pushbutton switch?
     
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  3. panic mode

    Senior Member

    Oct 10, 2011
    1,320
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    that would require continuous transmission.
    there are many toggle circuits. basically you need to build a T flip flop and trigger it with your circuit.
     
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  4. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
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    Try this circuit
     
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  5. WBahn

    Moderator

    Mar 31, 2012
    17,751
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    I was thinking "remote" as in "located somewhere else", but wired, and not "wireless remote".

    A big issue that is going to have to be dealt with is bounce. When you press the button on the remote, what ensures that the receiver sees that as exactly one press of the button (or, perhaps, misses it altogether forcing you to press it again, provided the physical layout is stuch that it will be obvious to the user that they need to press it again).

    OP: Can you provide some more details on what kind of communication (type of remote, etc) you are using?
     
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  6. Jomil

    Thread Starter New Member

    Jan 9, 2013
    6
    0
    What I am using is a remote control push botton, and reciever has a relay that works good on 12 VDC (this is basically my push button). On other side of relay I need a circuit that will accuate other relay that would basic example "turn light on and off". We are using these with a solar system of approx. 9 to 12 VDC system.
     
  7. bug13

    Well-Known Member

    Feb 13, 2012
    1,208
    38
    Hello,

    Watch this:

    EEVblog #262 - World's Simplest Soft Latching Power Switch Circuit
    http://www.youtube.com/watch?v=Foc9R0dC2iI
     
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  8. Jomil

    Thread Starter New Member

    Jan 9, 2013
    6
    0
    Attached is the circuit I was trying to use for my project. Here are the parts I am trying to use.
    1) Remote controlled push button - this would allow to remotely turn circuit on and off. On receiver end of remote, I have a relay that closes when I press the botton on the remote and opens when I release the button.
    2) Need circuit to to turn on when button on remote is pressed and released (switch on circuit), and shut off when button on remote is pressed and released again (switch off circuit).
    3) I also have other 12vdc relay that operates (closes) at 7.6 vdc and open at 2.6vdc (opens) that I would like to use in circuit that I can place higher voltage accross contacts to operate lights.

    Basically I am looking for a circuit that will act like a electronic light switch, that is stable. The drawing attached I have tried but it seems to fail. Please let me know if there is a solution. Thanks..
     
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