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Challenge - See if you can solve this simple circuit diagram

Discussion in 'General Electronics Discussion' started by stspringer, Feb 14, 2020.

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  1. stspringer

    stspringer

    114
    8
    May 10, 2019
    Ok I have this circuit diagram that I hooked up with 12 volt battery - 2 led's with dual terminals - low beam and high beam - high beam is 3.5 watt low beam is 1.2 watt - 1157 bayonet mount. I have 2 led flashers with battery terminal and load terminal I have a SPDT switch and a DPST switch

    This circuit will be used to simulate a cars "front only" running lights, turn signal - left and right - and hazard lights.

    I am uploading a pic of this circuit diagram. I have another circuit diagram that fixed my first diagrams problem almost 100 percent fix. Maybe someone could explain a total 100% fix

    RUNNING LIGHTS "PARKING LIGHTS" ARE ALWAYS ON IN THIS CIRCUIT

    PROBLEM WITH THE FIRST DIAGRAM:
    Now, this first diagram has a problem. When the turn signal is turned on, either left or right, the high beam led is hardly noticeable, very dim, will not even pass inspection as a turn signal same with the hazard lights turn them on and they are very dim hardly noticeable

    I am just uploading the diagram without the partial not 100% fix. Then I would like some feedback on what you think the fix would be to make the turn signals flash at full brightness.

    WHAT IS THE FIX I AM LOOKING FOR?

    When the turn signals or hazard lights are on they should bling at normal speed with full brightness
    not dim or hardly noticeable

    Thank you for your time
     

    Attached Files:

  2. Bluejets

    Bluejets

    3,690
    761
    Oct 5, 2014
    If you were to draw the circuit diagram in a conventional way you would immediately see the problem associated with the dual LED in each instance.

    It is this precise reason why, voltage fed auto lights in particular are switched in the negative AND in a particular sequence/arrangement.

    Without going any further I am 100% certain of the correct arrangement, but hell, that would spoil your fun.;);)
     
  3. stspringer

    stspringer

    114
    8
    May 10, 2019
    Correct Arrangement? You mean you would not add any components?
     
  4. Bluejets

    Bluejets

    3,690
    761
    Oct 5, 2014
    To begin with, you do not show any detail or link to the LED units currently used or the flasher units.
     
  5. stspringer

    stspringer

    114
    8
    May 10, 2019
    Last edited: Feb 15, 2020
    davenn likes this.
  6. Bluejets

    Bluejets

    3,690
    761
    Oct 5, 2014
    Trash the 2 element LED bulb and replace with 2 single element, perhaps add some load resistance to make the flasher work on LDE loading or replace with flasher designed to work with LEDs.
    No way of knowing the internal circuit of the LED combination without hacking into one and I'm not about to do that.
    I do however suspect the LED bulb / flasher combination to be the heart of the problem.( feedback in old terminology)

     
  7. stspringer

    stspringer

    114
    8
    May 10, 2019

    Hello Bluejets,
    I loved the video link you sent, very nice. I think I did what you mention here "perhaps add some load resistance"
    I will upload my partial fix diagram now. I say partial fix because the led blinks slightly slower but the brightness is very good.

    What I did was I added a diode and a 68 ohm resistor to the positive side of the led"s low beam wires

    "replace with flasher designed to work with LEDs". wasn't the Amazon link I sent you a led flasher?

    Tell me what you think
     

    Attached Files:

    Last edited: Feb 16, 2020
  8. 73's de Edd

    73's de Edd

    2,773
    1,159
    Aug 21, 2015
  9. stspringer

    stspringer

    114
    8
    May 10, 2019
    Thanks 73's de Edd
    Check out my schematic I drew with circuits lab web software. I used 2 relays and 2 led flashers and a DPST and SPDT switches
    The relay turns off pin 87a when the turn signal or hazard lights are on pin 87 is not used. I am happy

    Any ideas of what I could add to employ pin 87?
     

    Attached Files:

  10. stspringer

    stspringer

    114
    8
    May 10, 2019
    Check out my schematic I drew with circuits lab web software. I used 2 relays and 2 led flashers and a DPST and SPDT switches
    The relay turns off pin 87a when the turn signal or hazard lights are on pin 87 is not used. I am happy

    Any ideas of what I could add to employ pin 87?
     

    Attached Files:

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