Drunk driving is a big issue. This simple circuit can help prevent accidents by detecting alcohol concentrations. It's simple to use, inexpensive to manufacture,...
Some breadboard power supplies have adjustable voltage linear regulators to control the required output voltages. Efficiency of the linear regulators decrease as output power...
Here is a simple 4W audio stereo power amplifier using a ten-pin LA4601 IC. Only a few passive components, including ceramic and electrolytic capacitors,...
Battery-life measurement for a portable system is a time-consuming task and many methods used for it do not give reliable results. Presented here is...
You can make a digital sound synthesizer, for experimentation with sound equipment or with peripheral devices, using special integrated circuits or digital-to-analogue converters (DACs)....
The altimeter is one of the basic and most essential devices used in-flight systems, drones, space rockets, and submarines to measure the altitude of...
NTC thermistors are often the preferred choice for temperature sensing and control in many applications, primarily because of their small package sizes and attractive...
Assemble yourself a portable, four-channel multi-mode light controller using an Arduino Uno board and very few external components.
The fancy lights controller described here is...
Despite being more expensive than standard permanent outdoor toilets, portable toilets (Fig. 1) have several significant benefits as these are self-contained and can be...
The circuit presented here uses a crystal oscillator and frequency multiplier to generate a highly-stable carrier signal frequency of 96MHz. With 40mW of RF...
Gadgets like electronic toys and musical players commonly use 1.2V rechargeable batteries in capacities ranging from 200mAh to 2800mAh, which need to be charged...