R3 and c3 affect the flash rate r2 and c2. Here the led set consists of a 3 3 red and 3x3 blue leds. The given police light circuit consists of two 555 astable multivibrators. Circuit diagram of police lights using 555 timer. Both 555s work as astable flip flop each with a different frequency. Each group has four leds and they turn on and off alternately with like police style strobe light. 470 ohm resistor 1 4 watt 6. This police style strobe light circuit using 555 timer ics shows the familiar lights used on police cars. Their outputs are connected to antiparallel two groups of leds. The frequency and nature of flashing can be adjusted by changing the values of c2 c3 r2 and r3.
Circuit diagram of police lights using 555 timer. Bc547 npn transistors 2. Here the led set consists of a 3 3 red and 3x3 blue leds. Red leds 2. 22kω resistor 1 4 watt 1. The timer here generates pulses which are fed to the 10 stage decade counter the output of counter is so arranged to get a flashy. Their outputs are connected to antiparallel two groups of leds. And using the signal from the low frequency multivibrator the signals from the ic2 are alternately switched to the red and blue leds. One with a lower oscillation frequency ic1 multivibrator section and other with a higher frequency ic2 multivibrator section. Both 555s work as astable flip flop each with a different frequency.
This police style strobe light circuit using 555 timer ics shows the familiar lights used on police cars. 9v battery 1. The timer here generates pulses which are fed to the 10 stage decade counter the output of counter is so arranged to get a flashy. The ic2 consists of a simple led flasher circuit which continuously flashes the led. And using the signal from the low frequency multivibrator the signals from the ic2 are alternately switched to the red and blue leds. Blue leds 2. Whenever a group of leds activated its leds turn on and off three times with specific time interval. Both 555s work as astable flip flop each with a different frequency. This police light circuit is designed by 555 timer ic and a decade counter ic. 1kω resistor 1 4 watt 3.
In this project we are going to design a circuit to make a flashing light similar to that on a police car. Led 555 police flasher the figure below you can see the schematic diagram of a simple led police flasher with two popular 555 integrated circuits. The given police light circuit consists of two 555 astable multivibrators. Each group has four leds and they turn on and off alternately with like police style strobe light. By dilip raja may 23 2015 5. Blue leds 2. 470 ohm resistor 1 4 watt 6. R3 and c3 affect the flash rate r2 and c2. Here the led set consists of a 3 3 red and 3x3 blue leds. 9v battery 1.
Their outputs are connected to antiparallel two groups of leds. 1kω resistor 1 4 watt 3. One with a lower oscillation frequency ic1 multivibrator section and other with a higher frequency ic2 multivibrator section. The circuit produces alternating series of strobes of leds of each group. By dilip raja may 23 2015 5. The ic2 consists of a simple led flasher circuit which continuously flashes the led. Blue leds 2. In this project we are going to design a circuit to make a flashing light similar to that on a police car. Red leds 2. 470 ohm resistor 1 4 watt 6.
