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A water pump controller senses the level of water in a tank and drives the water pump. The circuit described here is built around timer IC1 (555). When the water level of the tank goes below the low level...
Wooden-case, battery-operated wall clocks with pendulums are available in the market. Some even have chimes. What is missing is the tick-tock sound of old mechanical pendulum clocks. Tick-tock sound generator circuit Shown above is the circuit of a tick-tock sound generator....
Using this 30 minute timer circuit you can switch on an appliance for a desired time. The circuit provides selectable time settings of 1, 2, 5, 10, 15 and 30 minutes, and can be used for domestic as well...
Using this fan speed controller circuit you can control the speed of 12V DC fans used in cars. The circuit is built around timer 555, which is wired as an astable multivibrator. Fan speed controller circuit Circuit operation The output of the...
This simple circuit of a duophone allows you to access two telephone lines through one telephone set. Each telephone conversation will remain entirely separate unless you choose to combine the two lines through a conference switch. Its unique feature...
This IR based light control circuit turns on the lights at the portico, car parking or other areas when a motorbike or car enters through the gate to cross the sensing area. It can also be used as an...
This water overflow alarm is built around two BC547 transistors and two 555 timer ICs
At night when power fails, one finds it difficult to reach the generator to start it. Here is the circuit for a generator room light that automatically turns on at night, facilitating easy access to the generator. During daytime,...
Here is a simple triple mode tone generator circuit that generates three different tones. You can use it as a call bell, burglar alarm or any other security alarm. Triple Mode Tone Generator Circuit Fig. 1 shows the circuit of the...
Here is a simple green LED flashlight built around 555 timer IC (IC1) and powered from a 3V battery pack. Green LED based flashlights are widely used by hunters and others in similar activities to light up their way and...