From Newsgroup: sci.electronics.basics

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 Newsgroup: sci.electronics.basics


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 Newsgroup: sci.electronics.basics

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 Newsgroup: sci.electronics.basics

In article <3f3b64a5-c084-435b-b44c-8292463f5b7en@googlegroups.com>, videmos0@gmail.com 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 Newsgroup: sci.electronics.basics

On 2023-01-08, Joe <videmos0@gmail.com> 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.
p|Ys+||Y-i|Y+| s-c+N|ab|e+| llreC
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