| Troubleshooting coffee machines with hidden magnets? Powered by AAA batteries and a Hall sensor, this simple magnet finder lights the way. L...
More about Circuit (709)
| To develop and service electrocardiogram (ECG) equipment, an artificial signal that mimics a real ECG is essential. Elektor presented this e...
| Learn how to read two potentiometers on a single digital input using a Schmitt-Trigger inverter and just six components. This compact, affor...
| RS-485 or RS-422 buses are still widely used in industry for access control, video surveillance and many other applications. However, the st...
| When measuring distortion in audio devices, it makes sense to filter out the controlling sinusoidal signal before the spectrum analyzer. Thi...
| Lithium coin cells in the 2032 format and similar batteries are commonly used as “keep-alive” energy sources to maintain data and keep clock...
| In audio circuits, the innovative technique of virtual grounds provides a viable alternative to the traditional method of switching signal l...
| 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...
| 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...
| Power banks often shut down when connected to low-current devices. This project offers a solution using a microcontroller (module) to keep t...