Two transistors cross connected as a bistable multivibrator change state at each signal. In this project, we have designed a simple application by which you can switch on or off a. The circuit is triggered by a declining edge, that is, by a rapid move from high to low. Controllable electronic load circuit for dc power supply 72 121. Clap activated switch device will serve well in different. It is a 16 bit timer that is capable of counting 65536 steps21665536. This circuit is built around timer ic 555 ic1, cmos ic 74ls93 ic2 and five bc547 npn transistors t1, t2, t3, t4 and t5. Clap switch has the ability to turn onoff any electrical component or circuit by the clap sound. The electret microphone picks up the sound of your claps, coughs, and the sound of that book knocked off the table. The circuit changes its output state only when you clap twice within the set time period. In a flipflop circuit, at a time only one transistor conduct and other cutoff and when it gets a trigger pulse from outside source then first transistor is cutoff and 2nd transistor conducts, thus output of transistor is either logic0 or logic1 and it remains in one state 0 or 1. In a flipflop circuit, at a time only one transistor conduct and other cutoff and when it gets a trigger pulse from outside source then first transistor is cutoff and 2nd transistor conducts, thus output of transistor is either logic0 or logic1 and it remains in.
This clap operated switch system works on detecting of sound of claps. Simple stereo level fm calling bell using an intercom. It is known as clap switch because the condenser mic. The trigger pulse, created by pressing the button, has to be of less period than the proposed output pulse. Get started for free sign up with facebook sign up with twitter i dont have a facebook or a twitter account. A circuit with clap operated switch, without moving out of your position or without getting out of your bed. Clap operated switch is an electronic system or circuitry which operates by clapping from a remote point. Pdf this paper presents the design of a clap activated switch device that will serve well in different. A circuited switch, which operates with sound of clapping hands or.
The amplified voltage is fed into the adc port of the microcontroller which. The clap sound sensed by condenser microphone is amplified by transistor t1. Applications wirein wall switch receiver operating just as simply as a plugin module, the wall switch receivers are addressable for x10 house and unit codes and receive. Olokede, seyi stephen 45 communication flow when need be. Managing our driver and elephant brains also include surroundings. Clap switch circuit for devices circuit working and applications. I will present two circuits for clap switches, both of these circuits will be. This has been such a great way for me to earn extra money. The basic principle of this clap switch circuit is that it converts sound signal. It produces a small electrical signal which is amplified by the succeeding transistor stage. The file contains 32 pages and is free to view, download or print. Switch dedicates itself to change processes that manage both aspects direct the rider and motivate the elephant along with a third segment, shaping the path, that details the steps once driver and elephant are mastered. The period, t, of the output pulse can be calculated from the design equation.
Simple stereo level indicator 42 72 fm bug 44 73 calling bell using an intercom from engineerin engg 112 at kathmandu university. We will use two basic clap switch circuit diagrams i. A small condenser microphone is connected at the base of transistor t1, which is biased from resistor r1 10 kiloohms. It also takes into considerations the illiterates that may. With the help of this circuit, speed of the fan can also be controlled by. Olokede, seyi stephen 49 circuit is expected to respond to two claps only when it is received within three seconds to energize a relay which will make connection with an external circuit. Winifred aldrich pdf free download monster high scaris.
Sharp r3a56 switch rectifier free 30day trial scribd. The motivating force behind this design is based on the desire to alleviate the problem faced by the aged and physically challenged persons in trying to control some household appliances. Clap switch is a basic electronics miniproject, made with the help of the basic components. Transistor t1 is used as the preamplifier and the rest are used for driving the relays. To turn onoff any ap pliance, you just have to clap twice. Pdf design of a clap activated switch researchgate. One of the recent studies on sound activated switches used sound produced by clapping. Ground pin pin 8 and supply pin pin 16 for the proper working of these ic these. This paper presents the design of a clap activated switch device that will.
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