Category: 555 Timer Projects

Door Bell Circuit

Engineeering Projects
circuit diagram of door bell

This project describes the constructional and working details of a door bell circuit. The door bell circuit presented here is of 2-notes (modulated sound) type and delivers about 4-watt Musial power at 12 volt. While using it as a door bell circuit, 6V DC supply is enough, which can be derived either from dry battery cells or a battery eliminator. The door bell circuit is flexible enough to work off right from 6V to 18V supply, without change of any component in the circuitry. However, it is important to use…

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Electronic Pendulum Using NE555

Engineeering Projects
circuit diagram of electronic pendulum using 555

Here is a simple, cheap and vary interesting electronic pendulum. The project electronic pendulum using NE555 can be used in various other gadgets i.e. it can be used in digital clock for pendulum view. Circuit Description of Electronic Pendulum Using NE555: The circuit of electronic pendulum comprises a timer IC NE555 (IC1), CD7400 (IC2), 4-bit up-down counter IC CD74193 (IC3) and a BCD to decimal decoder IC 7442 (IC4). Timer IC NE555 (IC1) is configures in astable multivibrator mode and generate square wave. The frequency of square wave generating from…

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Beeper Circuit using Timer IC 555

Engineeering Projects
circuit diagram of beeper using timer ic 555

Here is a beeper circuit employing two timer ICs NE555 (IC1 and IC2). The beeper circuit using timer IC NE555 can be used in various circuits that require an alarm or a ‘beeping’ signal. Description of Beeper Circuit Using Timer IC NE555 Timer IC1 is  used here  in astable mode in such a way that square-wave output at about 1 Hz is obtained. IC2 is also configure  in astable mode, but it gives an output with about 1 kHz frequency. The output if IC1 (pin 3) is connected to ‘Reset’…

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Photoelectric switch using ne555

Engineeering Projects
circuit diagram of photoelectric switch using 555

This circuit is of a highly sensitive photoelectric switch using NE555 timer IC. When the LDR1 is kept in light, the switch remains off, but when the light source is removed, the controller circuit gets switched on. This switch has vast application. With little modification, it can be used as a burglar alarm, a corridor visitors monitor, an automatic street lighting system, and as an automatic water tap system. Circuit Description of | Photoelectric switch using NE555 The NE555 timer functions here as a Schmitt trigger. A NE555 IC comprises two…

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Water Level Controller Using NE555

Engineeering Projects
circuit diagram of water level controller

Here is a circuit called Water Level Controller Using 555  which continuously monitors the level in the overhead and ground-level tanks, and switches on the pump whenever the water level in the overhead tanks falls below a predetermined level and switches off the pump whenever it reaches the maximum preset level so that there is no spillage. Further, if the level of water in the lower tank falls below a preset low level, this circuit overrides the commands being sensed from the overhead tank and switches off the pump. This…

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Sequential Timer Circuit Using NE555

Engineeering Projects
circuit diagram of sequential timer using 555

This is a simple sequential timer circuit using NE555 which can be used for psychedelic light, decoration in shops, advertisement boards at night, and parties. The circuit is similar to those published earlier, except for the fact that it incorporates some additional features. Circuit Description Sequential Timer Using NE555 In the circuit sequential timer circuit IC2, IC3 and IC4 are used as monostable multivibrators. The trigger terminals (pins 2) of these ICs are connected in a chain to the previous ICs through an RC differentiator network (0.022 µF capacitor and…

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High Brightness LED Strobe Using IC 555

Engineeering Projects
high brightness led strobe using 555 circuit

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 Description of High Brightness LED Strobe Using IC 555 Circuit diagram of high-brightness LED strobe is shown in figure 1. The entire circuit is build around timer IC NE555 (IC1) or we…

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Fiber optic telemetry system Using NE555

Engineeering Projects
circuit diagram of fiber optic telemetry system

Complete fiber optic systems are finding widespread use in all types of applications figure 1 provide a very simple fiber optic telemetry system using NE555 that can be used in a variety of telemetry application essentially. The transmitter is an astable oscillator using the popular NE555 (IC1). Circuit Diagram of Fiber optic telemetry system Using NE555 The variable resistance LDR1 contract the rate of the pulse applied to the LED. LDR1 can be any variable resistance transducer such as a strain gauge for pressure sensing, a thermistor for temperature sensing, or…

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Mains box heat monitor using 555 Timer IC

Engineeering Projects
mains box heat monitor circuit

Here is a simple circuit mains box heat monitor for sensing high temperature due to overheating. This circuit helps to prevent disasters caused by only sparking in the mains box due to any fault as a short circuit overloaded. This circuit is so designed that it also automatically switches on a bright white LED (LED3) in case of power failure. This light is sufficient to check the mains box wring or fuses in darkness. Circuit Description Mains Box Heat Monitor The circuit is built around a timer IC, a sensor,…

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DC Motor Control Circuit

Engineeering Projects
circuit diagram of dc motor controlling using single switch

The various motor control circuit is already available on the internet and this is also not a new idea for the electronics hobbyist. The circuit of the DC Motor Control Circuit, published here is different from another circuit available for motor control because it let you run a DC motor in a clockwise or anti-clockwise direction and stop it using a single switch. DC motor control circuit has also another advantage i.e. for proper operation of the motor this circuit provides a constant voltage. Here we use three LEDs LED1…

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