4 Wire Resistance Measurement – Kelvin connection
https://www.electronics-lab.com/4-wire-resistance-measurement-kelvin-connection/
This video describes and demonstrates the 4-wire resistance measurement (Kelvin connection) – what it is, and when & why it is used for making low valued resistance measurements. 4 Wire Resistance Measurement – Kelvin connection – [Link]
Arduino Countdown Timer
https://www.electronics-lab.com/arduino-countdown-timer/
Ardumotive.com shows us how to build a 2-digit countdown timer using Arduino. In this Instructables guide I will show you how to make your own Arduino two digit countdown timer. I made my own circuit by using the ATmega328 micro controller but this is an optional step. In this guide I will help you to […]
Building a PIN Diode Geiger Counter
https://www.electronics-lab.com/building-pin-diode-geiger-counter/
“Kai” is in the process of building a Geiger counter based on BPW34 photodiode and explains his first step for the sensor circuit. The common approach to protect the photodiodes from light is to use one layer of tin foil and connect it to ground. This should also protect the circuit against electromagnetic radiation. I’ve started with something […]
Researchers develop LED covering full visible light spectrum
https://www.electronics-lab.com/researchers-develop-led-covering-full-visible-light-spectrum/
Researchers have developed the first standard LED covering the full visible light, in collaboration with Nichia Corporation. LED and OLED lighting, which is generally called solid-state lighting (SSL), is becoming more common as the next generation lighting. Evaluations of total luminous flux (a performance index for lighting) and color are important for SSL, and to […]
RFID Computer login
https://www.electronics-lab.com/rfid-computer-login/
Luke wanted to login on his PC without having to type in a password. He solved this by using a RC522 RFID reader and an Arduino Leonardo. There are various products on the market that would solve this problem from fingerprint readers to proximity dongles but i decided to see what i could knock up […]
ST TL072 – dual JFET opamp die-shot
https://www.electronics-lab.com/st-tl072-dual-jfet-opamp-die-shot/
A new die shoot from zeptobars.com. Die size 1547×1279 µm. ST TL072 – dual JFET opamp die-shot – [Link]
Latching power switch uses momentary-action pushbutton
https://www.electronics-lab.com/49033-2/
Anthony Smith @ edn.com published a push button latching circuit able to control a load with a single push of a button. The circuit in Figure 1 shows how you can use a simple, momentary-action, SPNO (single-pole, normally open) pushbutton switch to latch power to a load. Requiring just a handful of common, garden-variety components, […]
Single transistor provides short-circuit protection
https://www.electronics-lab.com/single-transistor-provides-short-circuit-protection/
Keith Szolusha@ edn.com writes: In certain dc/dc-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circuit. A nonsynchronous boost converter provides a direct path from the input to the short circuit through the inductor and the catch diode. Regardless of current-limit protection in the IC, when a […]
Wireless digital scale
https://www.electronics-lab.com/wireless-digital-scale/
This is a wireless digital scale using ATTiny85 microcontroller and HM-10 Bluetooth low energy transmitter/receiver: This scale is wireless. It may be useful where you can’t operate a normal scale, due to the weather outside, or if you don’t want to scare birds or other creatures away. With this scale you can weigh them. In […]
4 Channel RC Servo Controller Board
https://www.electronics-lab.com/4-channel-rc-servo-controller-board/
This PIC microcontroller based RC driver is able to control 4 RC Servo by on board independent 4 potentiometer , 4X3PIN header for RC servo interface, screw terminal for supply input, on board power LED, optional 4X3PIN header connector for external potentiometer. Features Microcontroller based design for greater flexibility and ease of control Individual servo […]