Bicycle Light | Electronic Project Circuits

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Bicycle back Safety Light with IC 555 or 7555

Flashing 13 LED unit, 3V supply Also suitable for jogger/walkers

IC1 is a CMos version of the 555 IC wired as an astable multivibrator generating a 50% duty-cycle square wave at about 4Hz frequency. At 3V supply, 555 output (pin 3) sinking current operation is far better than sourcing, then LEDs D1-D6 are connected to the positive supply rail. In order to obtain an alternate flashing operation, a second 555 IC is provided, acting as a trigger plus inverter and driving LEDs D7-D12. D13 is permanently on.
The LEDs are arranged in a two series display as shown below, with a center LED permanently on. This arrangement and the alternate flashing of the two series of LEDs provide a pseudo-rotating appearance.

Bicycle back Safety Light with IC 555 or 7555

Parts:
R1_____________10K 1/4W Resistor
R2,R9,R10_____100K 1/4W Resistors
R3-R8,R11-R16__10R 1/4W Resistors
R17___________150R 1/4W Resistor
C1______________1µF 63V Polyester Capacitor
C2_____________10nF 63V Polyester Capacitor
C3____________100µF 25V Electrolytic Capacitor
D1-D13_____Red LEDs 5mm. or bigger, high efficiency
IC1,IC2________7555 or TS555CN CMos Timer IC
SW1____________SPST Slider Switch
B1_______________3V Battery (2 AA 1.5V Cells in series)

Read more Source : http://www.redcircuits.com/Page24.htm

Be the first to comment - What do you think? Posted by admin - September 8, 2007 at 10:43 pm

Categories: LED Flasher, Lighting Tags: 555 led flasher circuit, bicycle Light, IC 7555

Bike Light Flasher

I ride my bike allot at night and sometimes I’m not sure if people can see me. This circuit will flash an incandescent light that you can purchase from Radio Shack. Adjust the VR’s for your flash requirements and make sure that the lamp you use is designed to put out high brightness.

The enclosure should be water tight. The Batteries can be replaced by a bike wheel generator and a diode. If you add the generator then you can still use rechargeable batteries and the batteries will charge while you are riding your bike.

From : http://home.maine.rr.com/randylinscott/mar20.htm