Introduction: Flashing Brake Light - 555 Timer Circuit
I found at the China stores some electronic devices that can flashing the brake light. I will make that for my motorcycle topbox. Searching on the internet gave my various sides, I ended up with the flashing brake light from:
On his side he explained very well how it work.
So my circuit and device is based on his work and knowledge
Step 1: The Schematic and Parts List I Used
- 555 timer
- C1 - 47 uf electrolytic capacitor
- C2 - 1 uf
- C3 - 10nf
- D1 - 10v Zener diode
- D2 - 1N4148
- Q1 - BC547 - NPN
- Q4 - IRF4905
- R7 - 20 kohm trimpot
- R1 - 4,7 kohm
- R2 - 1 kohm
- R3 - 100 kohm
- R4 - 100 ohm
- R5 + R6 - 1,5 kohm
I tested the schematic with the parts on a breadboard. I worked fine at 12 volts.
I also tried diffrent volts, resistors and the electrolytic capacitor. I made some test with the circuit on the motorbike's brake light, with engine run, and with the trimpot I adjusted to the desired flashing. After testing I soldered the parts on a stripboard with solder points, it could fit in a case I got laying around. Befor I sealed it with hot glue I made the final test.