Bicycle Back Safety Light Circuit Schematic


Posted on Feb 6, 2014

This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles as a back light, or to put on by jogger/walkers. IC1 is a CMos version of the 555 IC wired


Bicycle Back Safety Light Circuit Schematic
Click here to download the full size of the above Circuit.

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.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

1.2 - 15V/3A variable and regulated PS
Low-frequency oscillator 10-150khz
Ultra-precise long time delay relay
Logic Tester
Headlight Flasher Circuit
Audio Phone Ring Generator Using Switching Supply
Nokia 5800 Ringtone Buzzer Audio IHF Speaker Repair
6V Gel Cell Battery Charger
audio tone control with 2 transistor
Door Ajar Alarm Circuit
Waterdrop device schematics
Charge amplifier circuit
Before power is in the hold state holding brake one circuit



Top