In this post I have explained a simple LDR brightness and efficiency tester circuit set up using an LDR and a digital Ohm meter. The idea was requested by Mr. Prashant Technical Specifications I want to check brightness and light of 1 watt led. Can i check it with help of ldr. Bekoz luminous sensor […]
Meters and Testers
Simple 1.5 V Inductance Meter Circuit
Here a simplest yet quite accurate inductance meter is presented, which can be built within few minutes. Furthermore, the circuit can be powered-up with a single 1.5V cell. However, a frequency meter would be required to work-out the inductance. Designed and Presented by: Abu-Hafss Using Cross-Coupled NPN BJTs The circuit is pretty straight forward wherein, […]
Make this Digital Temperature, Humidity Meter Circuit using Arduino
In our previous article, I have explained how to interface temperature humidity sensor with arduino and read out displayed on serial monitor of arduino IDE. In this post I have explained how to display the reading on a 16×2 LCD display for the proposed digital temperature/humidity meter using Arduino. Introduction This project may be used […]
Simple Transistor Diode Tester Meter Circuit
In this post I have explained how to make a simple yet efficient transistor/diode tester circuit, that will not only test the quality of a BJT, but will also help to identify whether it is is an NPN or a PNP. The circuit was designed and contributed by Mr. Henry Bowman. Circuit Operation Referring to […]
Alcohol Detector Meter Circuit using MQ-3 Sensor Module
An alcohol detector is a sensitive device which is able to detect the presence of alcohol molecules or any similar volatile inflammable element in the air and convert it into equivalent level of electrical output. The simple alcohol detector circuit discussed here will accurately sense the emanation of alcohol gas from a selected source, such […]
Homemade Inductance Meter Circuit
In this article I have explained a simple yet accurate, wide range inductance meter circuit. The design utilizes only transistors as the main active components and a handful of inexpensive passive components. The proposed Inductance meter circuit can measure inductance or coil values accurately over the given ranges and as a bonus the circuit is […]