The Bistable Multivibrators circuit is basically a SR flip-flop. This type of multivibrator circuit passes from one state to the other “only” when a suitable external trigger pulse T is applied and to go through a full “SET-RESET” cycle two triggering pulses are required. Bistable Multivibrators can produce a very short output pulse or a much longer rectangular shaped output whose leading edge rises in time with the externally applied […]
ABSTRACT This project work is on the construction of dark activated street lighting system. Which aimed at activating a switch or AC street light at sunset and deactivate it at sunrise. This Dark activated street light can trigger a relay to operate an AC street light at Sunset. The lamp remains on till morning and then turns off. This eliminates the need of switching the Porch lamp daily and also helps to light the road/street. The […]
ABSTRACT The main objective of this project was to ensure a proper security to building against theft or intruder. This device functions as a major security alarms used in residential, commercial, industrial, and military properties for protection against burglary (theft) or property damage, as well as personal protection against intruders . It is an electronic device that is connected to the battery being installed in and gets activ […]
ABSTRACT This work is on auto night lamp using high power LED. An Automatic Night Lamp Using High Power LEDs is a circuit which turns ON the LED lights interfaced to it at night time and it turns OFF the lights automatically when it is day. This project discuses the working of turning on or off of high power LEDs with light intensity. The element which is used for sensing light in the circuit is the light dependent resistor. The resi […]
ABSTRACT This work is a transistorized electronic ignition system. An electrical system for use with an ignition system of the type including an ignition coil and breaker points. The electrical system provides for low current through the breaker points to minimize wear and corrosion of the breaker points, provides a high primary winding current at saturation of the primary winding and of the transistors of the electrical system to pro […]
ABSTRACT This device is used to check whether a transistor is faulty or not. The circuit employs the properties of the gates of low power IC 4093. It is a NAND IC with four gates that can be designed in various ways. From the circuit first gate (N1) is designed as a simple oscillator with resistor R1 and capacitor C2. The remaining gates are used as inverters and buffers. The output of gate N1 (pin 3) is fed to gate N2 (pin 4), which, […]
ABSTRACT Multivibrators produce an output wave shape resembling that of a symmetrical or asymmetrical square wave and as such are the most commonly used of all the square wave generators. Multivibrators belong to a family of oscillators commonly called “Relaxation Oscillators”. Multivibrators have two different electrical states, an output “HIGH” state and an output “LOW” state giving them either a stable or quasi-stable state dependi […]