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  • Ideas for a 12V brake light flasher circuit

    From Joe@21:1/5 to All on Sun Jan 8 05:21:32 2023
    Hi,
    I'd like to try and build a brake light flasher circuit for a motorcycle (12V). Brake light should flash 3-5 times then remain on (solid red).
    I'm new to electronics so not everything is clear to me. Is it possible to build such a circuit and remain in 12V "domain" or is it necessary to step down to 5V to power an IC (a counter with a clock, for example) ?
    I'd like to use a 12V LED bulb (e.g. Philips Ultinon R1157), how would I go about starting a design for a circuit using that bulb?
    I'd appreciate any constructive help in the matter.
    Best,

    Joe

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  • From DJ Delorie@21:1/5 to All on Sun Jan 8 15:38:25 2023
    You could do it with two 555 timers, one for the flashing and a second
    with a one-shot. Combining them to get the results you need might take
    a few transistors.

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  • From ehsjr@21:1/5 to Joe on Sun Jan 8 17:15:47 2023
    On 1/8/2023 8:21 AM, Joe wrote:
    Hi,
    I'd like to try and build a brake light flasher circuit for a motorcycle (12V).
    Brake light should flash 3-5 times then remain on (solid red).
    I'm new to electronics so not everything is clear to me. Is it possible to build such a circuit and remain in 12V "domain" or is it necessary to step down to 5V to power an IC (a counter with a clock, for example) ?
    I'd like to use a 12V LED bulb (e.g. Philips Ultinon R1157), how would I go about starting a design for a circuit using that bulb?
    I'd appreciate any constructive help in the matter.
    Best,

    Joe

    If this is for learning or a fun electronics project, start with
    the datasheet for the bulb. With the datasheet information you'll
    learn what your circuit needs to provide to the bulb for proper
    operation. Then you design the circuit to provide that. And
    yes, it can be done at 12 volts.

    If you intend to actually install this on the motorcycle, you'll
    need to consider the environment - heat and cold, sleet, rain,
    snow, dust, mud, vibration, etc. There will possibly be
    legal/insurance/safety regulations that apply.

    Ed

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  • From Ralph Mowery@21:1/5 to All on Sun Jan 8 19:38:21 2023
    In article <[email protected]>, [email protected] says...

    Hi,
    I'd like to try and build a brake light flasher circuit for a motorcycle (12V).
    Brake light should flash 3-5 times then remain on (solid red).
    I'm new to electronics so not everything is clear to me. Is it possible to build such a circuit and remain in 12V "domain" or is it necessary to step down to 5V to power an IC (a counter with a clock, for example) ?
    I'd like to use a 12V LED bulb (e.g. Philips Ultinon R1157), how would I go about starting a design for a circuit using that bulb?
    I'd appreciate any constructive help in the matter.
    Best,




    A simple way would to use an Arduino micro processor. It would require learning how to program it. It would be a very simple program, just
    tell it which pin is the input, count to the number of off and on times
    and how many times before stopping. Then a transistor or other power
    device on the output to handle the current of the bulb. Those Arduino
    boards from China are less than $ 5.

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  • From Jasen Betts@21:1/5 to Joe on Mon Jan 9 02:18:06 2023
    On 2023-01-08, Joe <[email protected]> wrote:
    Hi,
    I'd like to try and build a brake light flasher circuit for a motorcycle (12V).
    Brake light should flash 3-5 times then remain on (solid red).
    I'm new to electronics so not everything is clear to me. Is it possible to build such a circuit and remain in 12V "domain" or is it necessary to step down to 5V to power an IC (a counter with a clock, for example) ?
    I'd like to use a 12V LED bulb (e.g. Philips Ultinon R1157), how would I go about starting a design for a circuit using that bulb?
    I'd appreciate any constructive help in the matter.
    Best,

    Joe

    It should be possible to remain in the 12V domain, possibly using
    a 4060 which is a counter and a timer in one part . HEF4060 CD4060
    MC14060 etc.

    Perhaps a diode from pin 4 to pin 11 to stop the timer, output from
    pin 7 to a P-channel MOSFET to control the lamp, timing circuit on
    pins 9,10,11 and a reset circuit on pin 12.

    --
    Jasen.
    pǝsɹǝʌǝɹ sʇɥƃᴉɹ ll∀

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