Lazy LED Flasher – Learner’s Edition
Every once in a while, I have found myself needing a quick circuit to blink a light emitting diode. It is quite easy to build simple microcontroller circuits which performs this task thru a few […]
Decade Resistance Box & A Cheap Substitute
The decade resistance box is an indispensable test gear for any electronics lab as it can be used to substitute different values of resistors during prototyping and/or experimenting with electronic circuits. Using it is easy […]
Simple & Safe Adapter for Optocouplers & Solid State Relays
An optocoupler, simply put, is a little device consisting of an independently-powered light transmitter and light receiver unit packed inside a light-proof shell that can be optically coupled together. Actually optocouplers are very easy to […]
KA431/TL431 Time Delay Switch
The real inspiration for this post actually came from lots of lame designs seen on the web. The last drop was a reasonably great written article presenting a number of blueprints to build timer circuits […]
BEMF and DC Motor Speed Governors
Do you know? You can govern the speed of brushed DC motors without any additional sensors, but using a basic characteristic – the speed-dependent back EMF (BEMF) voltage! The BEMF motion control technique has been […]
An Arduino Long Event Timer
A common application for electronic timers is to turn electrical devices on/off until a predetermined time, a task that can easily be implemented with ubiquitous microcontrollers like the Arduino! Usually that time period starts from […]
Poor man’s Car Power Probe
You do not need to read this post if you are willing to thoughtlessly throw away your hard-earned money to buy a car power probe that only has very cheap electronic circuitry inside. On the […]
BBC micro:bit Dark-Activated LED Badge
As promised, here is another fun BBC micro:bit project for your lovely kids. This time, get ready to make a dark-activated LED badge for them and enjoy! By now hopefully you have already gone through […]
741 Op-Amp Cookbook for Beginners (v1)
This post is about the far-famed and widely-used 741 classic operational amplifiers! While not attempting to share numerous potential applications, it includes one basic circuit idea that can be tweaked well to applications other than […]
Safe Car Power Socket v1
Now get ready to make your own safe car power socket using inexpensive components that are generally available. The simple device can then be used as a safe accessory power outlet to extend the 12VDC […]