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 […]
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 […]
OLED Display Splash Screen Primer
As promised, this is a follow-up to the Quick OLED Thermometer post covering a few things about customizing the OLED display splash screen. Oh, I could not get this posted here at the intended time, […]
Handheld Engraving Pen & A Little Hack
A handheld engraving pen can be used to create permanent and precise designs in hard surfaces like plastic, metal, wood, and the like. Inside the pen, there is a battery and a small electric motor […]
A Makeshift Silicon Diode Temperature Sensor
We all know that a reverse biased silicon diode can be used as a make-do temperature sensor (https://www.codrey.com/learn/bjt-diode-temperature-sensors-a-quick-walk/). But let me remind you again, a silicon diode, when reverse biased, will introduce a certain leakage […]
Emitter Follower – A Quick Look
So, I am revisiting emitter follower this moment and sharing my dusted thoughts on it. I hope this post helps someone one way or another! This article mainly looks at an emitter-follower (also known as […]
The LED Photodiode Trick
As I mentioned and proved in an earlier write up, a regular light emitting diode can also be used as a light sensor (https://www.electroschematics.com/led-2/). So, this is a post that goes into a bit more […]