A while back, I came across a set of multichannel optocoupler modules at a discount sale, and what immediately caught my attention was the PC817 dual-channel optocoupler module in that collection. So, this post is […]
Recently, I wanted to try an electronic scarecrow in my lab window to scare off some birds (often nocturnal) that make a lot of noise and dirt. Although there are many options for building one, […]
What is the point in critiquing a cheap Chinese power MOSFET module, you might ask. But I have a reason for that, because learning something useful from other people’s mistakes (even if they are trivial) […]
As Wikipedia says, a ceramic resonator is an electronic component consisting of a piece of a piezoelectric ceramic material with two or three metal electrodes attached. Like the similar quartz crystal, when connected in an […]
Self-lock delay switch is a simple timer module that produces a fixed square pulse. It is designed around the 555 timer and uses a tricky negative edge trigger to ‘run and lock’ the timer. The […]
Inspired by a dazzling Chinese design, I started thinking about making my own bicolor LED waistband with a few components lying around my workbench. In this post, you can see the basic design concept of […]
An LED signal baton (also called marshalling torch) is a proven gadget to head traffic. Primarily it is widely used by traffic police, attendants etc. to channelize traffic but it is a great handy aid […]
Sometimes you may need to make a battery-operated lamp flasher suitable for a variety of applications. In this post you will see the design concept of a 555 timer based multipurpose LED flasher that requires […]
On certain occasions it is necessary to use a sensor module that generates a relatively short pulse to indicate a change of status. If the duration of its output signal is too short, the associated […]
Raspberry Pi Pico W is another Raspberry Pi Pico but features Wi-Fi letting you to connect the device to a Wi-Fi network. In this quick starter post, you will learn how to start with a […]
