Here is one another project which is useful in our daily life using the most popular IC NE555. The project high-brightness LED strobe uses an array of 36 high-brightness LEDs. The advantage of project is it is small battery powered and very efficient. A variable resistor on the side allows the frequencies of the flashing to be varied.
Circuit diagram of high-brightness LED strobe is shown in figure 1. The entire circuit is build around timer IC NE555 (IC1) or we can also say IC1 as heart of the circuit. IC1 is here used in astable mode and generate pulse. The output of IC1 is obtained at pin 3 and is given to MOSFET transistor T1. LEDs are connected to output of MOSFET.
For power supply a 9V PP3 battery is used. When switch SW1 is pressed ON, timer IC NE555 (IC1) starts generating pulse which turns on the MOSFET and further drive the LEDs. VR1 used here to adjust brightness of LEDs strobe.
PARTS LIST OF HIGH-BRIGHTNESS LED STROBE
|Resistor (all ¼-watt, ± 5% Carbon)|
|R1, R2 = 10 KΩ
VR1 = 1 MΩ
|C1 = 1 µF/16V
C2 = 10 nF
|IC1 = NE555
T1 = FQP27P06 (N-channel MOSFET)
LED1 – LED36 = white LED 500 mm, 20,000 med, If 30mA, Vf = 3-3.3V
|SW1 = SPST on-off toggle switch
B1 = 9V PP3 Battery