Poor man’s AC230V Smart Plug v1
Recently I have received a few messages from a follower who is interested in making a simple relay box that will help him operate some regular electrical devices using the control signal from a common […]
Inverter Crystal Oscillators & A Half-Baked Project
This post describes the construction of basic crystal oscillator. The key parts in the experimental setup are a KDS4.000 quartz crystal (4.000MHz) and a SN74HC04N hex inverter IC. It should be easy to use an […]
Mixtile Core 3588E system-on-module works with NVIDIA Jetson TX2 NX carrier boards
Mixtile has just unveiled 18% OFF discount for pre-ordering the Core 3588E. Mixtile Core 3588E System-on-Module (SoM) is driven by the potent RK3588 chipset, delivering impressive performance while consuming minimal power. Key features of this […]
Window Comparator Revisited
Circuit configuration of a Window Comparator usually consists of a pair of inverting and non-inverting voltage comparators in which the output indicates whether an input signal is within a voltage range defined by two different […]
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 […]