LM358 Variable Threshold Solid State Switch
I think you’re all familiar with the various Chinese sensor modules based on the LM393 IC. That’s good, but at this point I’ll share the design idea of an LM358 IC based variable threshold solid […]
Chinese USB LED Lamp Quick Review & Teardown
I recently picked up a bunch of minuscule Chinese USB LED Lamps. You’ve seen these amazing gizmos before, I’m sure, under a variety of names in places ranging from local street merchants to online electronics […]
An Improved Analog Sensor Interface
A while back, I got an inquiry via email about building a simple electronics circuit to monitor the status of an analog sensor i.e., whether it is open or working properly. After a little discussion, […]
Midget USB LED Lamp – DIY
There is nothing amazing about looking at the design concept of a simple USB LED lamp, I know. But believe me, the midget USB LED lamp presented here has a little power reservoir in the […]
Webcam Servo Sweep (v1)
A few weeks ago, while working on another project, someone asked me to build a simple sweeping system for a tiny webcam. I set it aside for the next day and built a webcam servo […]
Resettable PTC (PPTC) Fuse Basics
This post is a quick introduction to resettable PTCs (PPTCs). A polymeric positive temperature coefficient device (PPTC) is a passive electronic component used to protect against overcurrent faults in electronic circuits. Simply put, a PPTC […]
L9110 Fan Motor Module – Quick Look!
The most popular, cheap fan motor module that’s available on Chinese webstores is the L9110 Fan Motor Module. At some webstores you can see this module is listed as a “Fan Module with Propeller and […]
System Voltage Supervisors & DS1232L Micro Monitor Chip
This little post, as the title suggests, shares some random thoughts on system voltage supervisors and related things! Supervisory Circuit Supervisory Circuits are electronic circuits that monitor one or more parameters of systems such as […]
TFT Display & Arduino – A Quick Primer
This post shows how to get started with a quite popular and comparatively cheap color TFT display module with an Arduino Uno. To start this experiment, you need the following key components. Arduino Uno R3 […]
Arduino Analog & PWM – Little Secrets!
As Maya Angelo, an American civil rights activist and poet, once said, Do the best you can until you know better. Then when you know better, do better! So, here’s a review post to keep you […]