Improved Door Security Monitor Switch
Nowadays, there are various types of switches available to help you track whether your door is open or closed. Such a door status monitor switch changes its states when the door is opened or closed. […]
hFE Test Connector/Adapter for Analog Multimeter
As mentioned in my previous post, some analog multimeters offer the hFE test feature via a custom-made hFE connector that is usually sold as an optional accessory. The popular Sanwa YX-361TR analog multimeter is a […]
Poor man’s Transistor Beta (hFE) Tester
The hFE socket on most cheap digital multimeters provides a dc gain value (often simply pointed as β) useful for evaluating small signal silicon transistors. However, only a few multimeters with the quick NPN/PNP transistor […]
A Hyper LED Switch
This post explains how to build a Hyper LED Switch using a set of simple and inexpensive electronics components that are available everywhere, you can even find them in your junk box. So, what is […]
An Eternal LED Blinker – DIY
Once again, the design concept of an Eternal LED Blinker configured to operate from a DC supply in the 3V to 12V range and consisting of only a few components. Since its power consumption is […]
Poor man’s 500kHz Oscillator
This post demonstrates an example of a cheap ceramic resonator based 500kHz oscillator. You can consider this a more practical version of my previous post on this topic Learn To Play with Ceramic Resonators The […]
Toy/Hobby DC Motor Fun
Toy DC Motors, also known as Hobby DC Motors, can be a good choice for low-budget or pocket-friendly basic electronics projects. They are very rugged, easy to use, and generally available with a wide range […]
Another Junk Box Solar LED Candle
Solar powered novelty items such as an electronic candle have become very inexpensive and common place. Looking from the outside, it consists of a small solar panel to harvest power from daylight and some sort […]
Water Activated LED Marker
The water activated LED marker is a great scuba diving or night diving accessory. Its bright marker light turns on when its sensor probes come into contact with water and turns off when the probes […]
Arduino Magic Eye
Now remember that you can interchange a regular LED for a standard silicon photodiode in most projects. The best way to come up with new applications for light emitting diodes that act as photodiodes is […]