Tutorials on electronics for beginners, hobbyist, and experienced geeks. Electronics is a vast area that covers analog and digital systems. Codrey explains how to build your own analog circuits and transforming them into digital blocks.

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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 […]

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 […]