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555 Timer Circuits

This section of EG Labs brings you some interesting electronic projects and circuits based on 555 Timer IC. These 555 timer based circuits and schematics are a good reference to learn and understand the basic timer circuits.
Latest 555 Timer Circuits

Many devices require input pulses for their operation. Some device requires continuous train of pulses some requires single pulse. In some of the devices there is a provision to alter between continuous pulses and single pulse. For example a stepper motor controller can have two operating modes – auto and manual. In auto mode it requires continuous pulses to rotate motor continuously while in manual mode it requires single pulse to be generated when button is pressed manually.

The circuit presented here is 2 in 1 circuit that generates low frequency pulses in the output. It has two operating modes. In auto mode it generates pulses continuously and in manual mode it generates pulse when push button is pressed. The circuit is built using single IC555. To generate continuous pulses it is configured in astable mode and to generate single pulse it is configured in monostable mode. 

Many of us face problem when we out of our home like if we want to on the motor, so that when we reach home water will be filled in over head tank or we want to on other appliances like light fan etc. Hence to solve this problem we have describe a simple circuit which will on your device or appliances remotely and it will become off automatically after preset time interval.


Many circuits have been developed so far to solve this problem but main advantage of this circuit is uses readily available components and this circuit is not expensive as well because this circuit is made using without microcontroller.

You can play with your friends to know there reaction time. This is very simple game in this 10 LED's are moving in a random fashion. And you have to hit a particular LED given by your opponent and you will get four chances to hit the right target. And if he or she hit the target correctly 10 points will be given. So at last the person who has scored more points will be declared as winner.


Advantage of this circuit is that it will not harm the eyes of children when they play for long duration. As instead of video screen this circuit uses LED for display. It can be easily assembled because of less and easily available components. This circuit also produces a sound when you hit the target like you get in video games. So you will get feel of real video game. You can easily power the circuit with the help of adapter available in market.

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