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 […]
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 […]
USBx3 Power Bank Module – A Look Inside!
The post was created some time ago and I’m not sure if things have changed, but it worth a shot! Back in January 2020 I picked up one Philips DLP6006B 11000mAh Li-Ion Power Bank on […]
LM336Z-5 Quick Refresher
There are times when it’s astounding to be able to make a programmable shunt regulator, perhaps using obsolete components from your junk box. Recently, I used a modest little circuit to do that thing; the […]
LED Inverter Lamp – Quick Teardown
Prolonged blackouts have always been an annoyance, but with the help of today’s portable inverter lamps/bulbs, tackling them has become much easier. Below you can see such an affordable LED Inverter Lamp from Osram (India). […]
Lavet-type Stepping Motor & Quartz Clock Engine Hacks!
Wikipedia says the Lavet-type Stepping Motor is a special kind of single-phase stepping motor widely used as a drive-in electromechanical clock. Aside from clock drives, there are many variations of Lavet’s concept, and one example […]
RCWL-0516 Doppler Radar Motion Sensor Module – Revised Primer
This is a quick revision of the cheap and popular motion sensor radar module RCWL-0516 (https://www.codrey.com/electronic-circuits/microwave-radar-motion-sensor-switch/). The RCWL-0516 module would be a good choice for making motion sensing lamps and other devices, and it probably […]