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Most computer UPS have only 230V output and no USB output. Presented here is a USB power circuit that gives 5V USB output using the 12V, 7Ah UPS battery fitted inside a UPS. With this circuit you can power...
In India, we have a large power distribution system with heavy distribution losses and variations in industrial/ domestic load. This results in voltage variations that may damage electrical/ electronic appliances like light, fan, television, mixer-grinder, air-conditioner, heater, water pump,...
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...
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...
Here is a simple, chargeable leakage and continuity tester that can be operated in two modes: normal mode and gain mode. The gain mode is especially useful for detecting small leakages in electrolytic capacitors or large resistors, which can’t...
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...
What binoculars do to improve your vision, this personal sound enhancer circuit does for listening. This light-weight spy ear gadget produces an adjustable gain on sounds picked up from the built-in high-sensitivity condenser microphone. So you can hear what...
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...
This ball speed checker circuit measures the speed of a cricket ball based on the time taken by the ball to travel the distance from the bowling crease to the batting crease. Ball speed checker circuit As shown in Fig. 1,...
None of us likes bugs at home. To kill these flying insects, they should first be attracted and then electrocuted. An electric fly swatter is one such device with a high voltage electrocuting circuit and an insect attracting UV...