![Arduino Countdown Timer Arduino Countdown Timer](https://www.electronics-lab.com/wp-content/uploads/2016/05/FP6CQL1IOEBCLE1.MEDIUM.jpg)
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...
Continue Reading![Building a PIN Diode Geiger Counter Building a PIN Diode Geiger Counter](https://www.electronics-lab.com/wp-content/uploads/2016/05/Photodiode-with-Liquid-Rubber-Coating-1024x683-1024x683.jpg)
Building a 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...
Continue Reading![Researchers develop LED covering full visible light spectrum Researchers develop LED covering full visible light spectrum](https://www.electronics-lab.com/wp-content/uploads/2016/05/2-researchersd-e1463651650464.png)
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...
Continue Reading![RFID Computer login RFID Computer login](https://www.electronics-lab.com/wp-content/uploads/2016/05/20160316_114913-1024x525.jpg)
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...
Continue Reading![ST TL072 – dual JFET opamp die-shot ST TL072 – dual JFET opamp die-shot](https://www.electronics-lab.com/wp-content/uploads/2016/05/ST-TL072CDT.jpg)
ST TL072 – dual JFET opamp die-shot
A new die shoot from zeptobars.com. Die size 1547x1279 µm. ST TL072 - dual JFET opamp die-shot -...
Continue Reading![Latching power switch uses momentary-action pushbutton Latching power switch uses momentary-action pushbutton](https://www.electronics-lab.com/wp-content/uploads/2016/05/latching-circuit.png)
Latching power switch uses momentary-action pushbutton
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...
Continue Reading![Single transistor provides short-circuit protection Single transistor provides short-circuit protection](https://www.electronics-lab.com/wp-content/uploads/2016/05/short-circuit-protection-circuit.png)
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...
Continue Reading![Wireless digital scale Wireless digital scale](https://www.electronics-lab.com/wp-content/uploads/2016/05/F9IVS3JIO7EMPYQ.MEDIUM.jpg)
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...
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