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Last Updated: May 18, 2012

Universal Electronic Signal Flasher for Motorcycles

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To use light emitting diode or LED in your motorcycle, ordinary thermal flasher wont work due to the high resistance of led, and that it needs to have a load resistor or dummy load in order to flash leds, which means a power waster.  Many light enthusiast of course didnt understand this that after replacing their signal bulbs to all leds, it didnt blink or blink too fast. Solution, A Universal electronic led flasher.

Figure 1. is a solid state two wire led flasher that will flash even a single led without the use of load resistor. It is so versatile and will prove useful in any number of circumstances. The circuits scales from micro amps to amps and from microseconds to minutes.

The on time may be increased by selecting other values of the 10k ohm resistor of the 2n4401 npn transistor as long as the resulting base current is sufficient to saturate that resistor.
 

This is another version of an electronic flasher i used on all of my leds application, this time using 555 timer ic as the main source of pulses to on/off the power mosfet and thus blinking the leds..





The OEM bimetallic thermal flasher is designed for a high load so it won't work anymore.  An electronic/capacitive discharge flasher eliminates the load requirements (load resistors). Any P-Channel MOSFET should work fine. 20K pots give you a decent range. The top is off time, and bottom is on time.





Remember...there are lots of Electronics Flasher being offered as aftermarket parts for motorcycle..all i can say...its better to save your money and find someone to build this for you...because for me, aftermarket parts SUCKS...espescially if its cheap...

UPDATED: may, 19,2012

in order for the flash to be stable on a wide variety of input voltages like those on a motorcycle which ranges from 12-14.4 volts, we need to put a voltage regulator so that the supply voltages for the 555 timer IC shall and will still be constant irregardless of the range of input voltage within your motorcycle. PHOTO shown below will complete the circuit above.
Cut the path of the 555 pin 8 supply from the original 12 volts supply then follow the add-on regulator, from here the supply of the IC will be coming in from the regulator and will be fixed at 11.4 volts. The 12 volts zener value for this add on can range from 500mw to 1 watt type. For the 500mw, u can use 1n4742.

6 comments:

Master Circuits said...

ANY p channel mosfet will work on the 555 timer version....as long as the Rds is low...

Anonymous said...

thanks for sharing :)

Anonymous said...

sir kindly post the schematic of your adjustable electronic flasher..or pls send me a copy..MCP member..jeybratt.TIAZ

LEI said...

@jaybratt,
the schematic is already posted here, it uses the 555 timer circuit..you have to fixed one trimpot to a fixed value resistor, the other will then be adjusted for your desire and preferences, i didnt use any pcb for it, since it will be bulky, use the solder pin to pin technique and put some glue all over it, cover with shrinkable tube expose the two wires, the positive and negative, put terminals..and you are done,

Anonymous said...

Thanks a lot sir..
Ride safe...
jeybratt

Anonymous said...

Thanks sir LEI...
tapus ko na and its working...
Ride safe sir..
jeybratt>