Presented here is an automatic motion sensor switch built around a cheap ‘Doppler Microwave Radar Sensor’ that can be easily used as standalone detection sensor. The circuit, designed as an alternative to the common PIR […]
Nowadays most electronics hobbyists require a precision 3.3V power supply module for their microcontroller (uC) and/or internet of things (IoT) projects. The traditional linear power supply is not a good choice in many situations because […]
Recently I got a couple of powerful laser diodes from a friend abroad. The ‘invisible’ (infrared) laser diodes with 1000mW and 2000mW power (808nm wavelength) are good for numerous applications like solid-state laser excitation, infrared […]
Here is the circuit of a do it yourself universal relay module for microcontroller projects. One advantage of this design is that it can work with both active-high and active-low TTL signals from the I/O […]
Outcome of a product teardown can be used by hobbyists/makers to find out what components are being utilized in the electronic product. Such knowledge can aid understanding of how the system works, including innovative design […]
Most modern wireless experimenter kits comes as modules that just plug together rather than individual components. Electronic newbies, practicing engineers, and experienced hands alike are sure to find that these inexpensive modules interesting. Recently I […]
The circuit below shows a simple light emitting diode tester, powered from a 9V compact battery,which can be used to test almost all common light emitting diodes (LEDs). Common LEDs require a dc forward bias […]
Solar electronic snake repellent presented here is a proven solution to keep all poisonous snakes out of dog kennels, stables, etc. All you need is to simply place the device on the ground to remove […]
Here is one interesting circuit of an automatic, passive infrared motion sensor controlled, speed regulator switch for ceiling fans. The circuit, designed for AC230V operation is realized using generally available discrete components, and optimized for […]
Validating the calibration of an electronic test and measurement instrument such as a digital voltmeter (DVM) is very crucial especially after many years of service. Nowadays, it is easy to build a compact voltage reference […]
