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Category: Sensors Detectors / Human Sensing Circuits This circuit is also crossed to: Switching Circuits , 555 Timer Circuits Views: 2655 Rank: 0 A single hand clap will be picked up by the electric mic which is coupled through C1 into the op amp IC1. The output of IC1 triggers the 555 IC timer IC2 which is configured as a monostable multivibrater. The trigger pulse is stretched by IC2 and outputs a pulse to IC3 a D type flip flop. Because of the three state counter arrangement of IC3, two sharp claps are required before IC3 will output a high to Q1 which will turn on K1 relay and any device connected to K1's switch contacts. Two more claps will clock IC3 again and will turn off Q1 and any device connected to the K1's contacts. I had my unit connected to my xmas tree lights so that I wouldn't have to crawl behind the tree to turn the lights on and off. Sensitivity for the circuit is R3 and should be adjusted so that the circuit ignores normal room noise. visit page.  
Related circuits Using digital techniques, this circuit accomplishes the frequency-inversion algorithm via digitization of the audio, inversion of the sign of every alternate sample, and D/A conversion of the resultant data. The result is an inverted frequency spectrum. The circuit on the right uses three bipolar transistors to accomplish the same result with the touch contact referenced to the negative or ground end of the supply. Since the base of a bipolar transistor draws current and the current gain is usually less than 200, three transistors are needed to... Sensitive Low-Current-Drain Motion Detector This highly sensitive movement detector is designed from bipolar transistors and draws a curren Solenoid trip circuit works at battery`s end of life This Design Idea involves a low-power motion-detector circuit that operates from battery power for extended times. Part of the design includes a solenoid-operated trip mechanism that triggers whenever it detects motion. The drive circuit for the solenoid in the original design worked fine as long... 5V CAPACITANCE TOUCH ACTIVATED MOMENTARY SWITCH This circuit is discussed in more detail in the section on Capacitance Proximity Switch Technology. The circuit is powered from a standard +5v supply. It has both a source and sink output that change state whenever a metal button connected to the circuit is touched. An earth ground reference is... This touch-actuated switch stays on as long as you keep your finger on the touch plate. Rl sets the input impedance to a high 22 MO. Ql picks up stray signals coupled through your body to the touch plate and amplifies them to tum on Q2, which turns on lamp drivers Q3 and Q4. Lamp 11 is any... Scheme implements multiple output ports In µP/µC systems, you sometimes need to use many output ports and update all the ports simultaneously. For instance, in systems that use multiplexing techniques, the output ports require refreshing for every scanning period. One example is a system of multiple dot-matrix LEDs. Suppose that an... The SillOO series circuit input is connected to a capacitive field sensor-possibly a piece of doublesided circuit board. Any induced voltage change on the plate is fed to the input of the peak detector section of the op-amp circuit. The Schmitt trigger monitors the voltage across the capacitor...
Articles & Projects
This Clap switch circuit is designed using 555 timer circuit and some common electronic parts . This clap switch electronic circuit project operates from a distance of up to 10 meters from the microphone . Signal from microphone is amplified by ...
Clap Switch Circuit Diagram. Here's a clap switch free from false triggering. To turn on/off any appliance, you just have to clap twice. The circuit changes its output state only when you clap twice within the set time period. Here, you've to clap within 3 seconds. The clap sound sensed by conden...
The configuration is actually a transistor based clap switch, but without a flip flop stage, rather the flip flop is replaced by a delay OFF timer stage for the necessary switching and sustaining of the lights for a fixed predetermined ...
THIS MAKES A BASIC CLAP SWITCH. Change the values of resistor and capacitor on 555 timer to change the timing of the circuit. basic-clap-switch-in-fritzing1 · basic-clap-switch. PLEASE IGNORE THE REPEATED NAMES ...
If you put your finger on Pin 2, the timer will be triggered, and the LED will be switched on. In this project, the triggering is done by the transistorized circuit. When you blow air or clap near the microphone, the transistorized ...
Here is one of the interesting 555 timer circuits to trick your friends while studying electronics in schools. Clap switch circuit is the local name of sound controlled flip flops. This sound controlled light can also be used as sound ...
How to make clap switch, easy steps-www.buildcircuit.com
How to make Touch switch using NE555- www.buildcircuit.com
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