Category Archives: 555 Timer

Telephone Lamp


Here is a White LED Lamp that turns on when the telephone rings. The cool white light helps to locate the phone in darkness and also helps to note the message or telephone number. The lamp remains on for three … Continue reading

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Battery Protector for Emergency Lamp


Emergency lamps do not have a facility to prevent the deep discharge of battery if the lamp remains on during day time. The fluorescent lamp filament also damages if it is glowing in low battery voltage. This causes blackening of … Continue reading

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Electronic Mail Box


This circuit generates Music intimating the arrival of Mail

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IR RECEIVER


This circuit can operate a load such as LED, Buzzer or Relay for a period of 3 minutes through a Remote hand set. It uses the IR sensor module TSOP 1738 which operates in 38 KHz Infrared pulses.

Posted in 555 Timer, Exhibition Projects, Hobby Circuits, Home projects, Infrared, School Projects, Sensors | Tagged , , , | 2 Comments

Remote Jammer


This circuit can Jam the remote handset used to operate TV. As long as the circuit is active neat the TV, the remote hand set cannot change the channels

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HEAT SENSOR


This is the circuit of a simple Fire Sensor that uses an ordinary Signal Diode as heat sensor. As soon as the temperature near the diode rises above the preset value, alarm will be generated to indicate high temperature. Alarm … Continue reading

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Sensitive Clap Switch


This is the circuit of a very sensitive clap switch. It switches ON/OFF a White LED or electrical appliances through claps. The circuit can sense the sound of claps from a distance of 1-2 meters. Circuit in Word format

Posted in 555 Timer, Exhibition Projects, Hobby Circuits, Home projects, Op Amp, Sound, Uncategorized | 2 Comments