Rongge

Here is an interesting circuit , it is used to make a kind of lock or locks for bicycles , it allows owners to implement a bicycle lock and electronic alarm with a low cost . The operation of the electronic lock is simple , it has a circuit that uses a tone generator IC UM3561 , this IC generates a sound when your bike has the protection wire that surrounds the wheel broken .   Blocking Circuit with Alarm for Bicycle Circuit Diagram Click here to download complete project

How to build a 40 LED Bicycle Light Electronic circuit Project? This is a very Simple to build This electronic circuit project of 40 LED bicycle light.  The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K for R1, 150K for R2 and a 1uF capacitor). Time intervals for the two lamps are about 107 milliseconds (T1, upper LEDs) and 104 milliseconds (T2 lower LEDs). Two transistors are used to provide additional current beyond the 200 mA limit of the 555 timer. Simple 40 LED Bicycle Light Circuit Diagram : A single LED is placed in series with the base of the PNP transistor so that the lower 20 LEDs turn off when the 555 output goes high during the T1 time interval. The high output level of the 555 timer is 1.7 volts less than the supply voltage. Adding the LED increases the forward voltage required for the PNP transistor to about 2.7 vo...