| In audio circuits, the innovative technique of virtual grounds provides a viable alternative to the traditional method of switching signal l...
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| In an audio chain, it may be useful to have an insertion point for an additional signal-conditioning device, such as a dynamics compressor/e...
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| The popular ESP8266 and ESP32 development boards will not run for long from a single Li-ion cell. The on-board regulator is the problem and...
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| Power banks often shut down when connected to low-current devices. This project offers a solution using a microcontroller (module) to keep t...
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| This microcontroller-based relay circuit is capable of activating devices remotely after a delay up to 255 years. The solution is ideal for...
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| In the EU and California, USB-C power adapters are now mandatory for cell phones and many other portable devices. So if you need some power...
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| Standard logic ICs such as the 4017, a 5-stage divide-by-10 counter, can be used in many applications instead of microcontrollers — for exam...
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| Some clocks use the frequency of the mains voltage to keep accurate time. But what if a design is intended for a 50-Hz mains and doesn't...
| When taking measurements in ionization chambers and other radiation sensors, it's often essential to handle small currents in the picoamp to...
| With inexpensive ultrasonic sensors, you can design both basic and sophisticated measuring devices for various ranging applications. By comb...