BIKE TURNING SIGNAL

716

08:51:29

The objective of this circuit is to indicate left or right turn for bike/vehicle. The main component of this circuit is the infamous 555 Timer IC. Here, this 555 timer acts as an Astable multi vibrator. It generates the pulse signal with variable width. Using this variable width of the pulse, we can set different time delays for the LEDs (ON and OFF for LEDs).

The circuit consists of two important resistors (100KΩ and 470KΩ), which are connected to 555 timer and these are used to set the time delay for LEDs. The output of the 555 Timer IC is given to either LEFT indicator LED or the RIGHT Indicator LED using a Slide Switch. 

1n4148 signal diode is connected in reverse bias at the output to maintain constant current at the output. BC547 (NPN) Transistor switches the LED’s ON and OFF based on the base currents. 330 ohm resistors are used to drop the voltage otherwise LEDs may get damaged. Here we can vary the time width of output pulse by varying the resistance or capacitance value.

published 5 years ago

Robert_Kidd

5 years ago

EC sadly doesn’t have a 3 way switch but you’d need one otherwise you’d never be able to travel in a straight line :-)

Robert_Kidd

5 years ago

If you change the timebase to 1 second you’ll see operation of circuit more clearly.

Robert_Kidd

5 years ago

Finally, EC LED’s are nominally 20mA so the current limiting resistors could be increased.

digital_electronics

5 years ago

Same circuit: http://everycircuit.com/circuit/5238916226220032

badassfromaus

5 years ago

Here is one I fitted to a Trike that is electrically driven. https://everycircuit.com/circuit/5267046854819840

Pushpam911

5 years ago

badassfromaus nice circuit

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