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The circuit for an LPG leakage detector is readily available in the market, but it is extremely expensive and usually based on a microcontroller (MCU). Presented here is a low-cost circuit for an LPG detector that you can build...
The circuit presented here can be used to drive USB-powered smart devices, including smartphones, while riding a bicycle. Smartphones suck battery power extremely fast, particularly when GPS and data connectivity are in constant use, and display and backlight are...
Here is a simple DC motor speed controller circuit that can be configured to control the sweep rate of automobiles’ windscreen wiper. The circuit comprises a timer NE555 (IC1), medium-power driver transistor BD239 (T1), high-power switching transistor BD249 (T2) and...
This alarm plays your prerecorded voice message. It is built around the readily available quartz clock. Take the buzzer out of the quartz clock and connect its positive terminal to pin 1 and negative terminal to pin 2 of...
A white cane is used by the blind or the visually-impaired to scan the surroundings for obstacles and orientation marks, and find the correct path. The visually-impaired using a white cane still need a sighted guide when they need...
Described here is an easy-to-use circuit of an automatic infrared (IR) faucet controller suitable for hand hygiene and water conservation at homes, hospitals and offices. With this compact controller you can turn on and off a faucet automatically, preventing...
Electronics projects are always in high demand. Students work on them to improve their skills, whereas hobbyists like the fun in meddling with technology. For professionals, it’s a different ball game altogether. Mini projects form a middle ground for...
AC switches are silicon devices that control AC loads directly connected to the AC mains. This means that the driving reference terminal of the AC switch can be connected to the Line potential. This circuit explains the need for...
Op-amps require dual-polarity supply for proper operation. When working with battery supply, it becomes difficult to get dual power supply for the op-amps. Presented here is a simple circuit that provides ±5V from a 9V battery. Circuit and working The...
An inverter turned into an emergency power system, which turns on when the mains supply fails, and more importantly doesn’t turn on when the main supply is available. Can you give me a setup (emergency lighting system) where few of...