Simple Low-Cost And Versatile Battery Charger
Presented here is a versatile circuit to charge batteries ranging from 6V through 48V. At home, garage or laboratory, you may have several rechargeable batteries with voltages rated at 6V, 12V,...
Four Stage FM Transmitter
This four stage FM transmitter circuit uses four radio frequency stages: a VHF oscillator built around transistor BF494 (T1), a preamplifier built around transistor BF200 (T2), a driver built around transistor...
Adjustable AC Circuit Breaker
This circuit breaker employs a single operational amplifier (op-amp) and yet has a wide range and is user-friendly. A circuit breaker is an electrical switch intended to protect an electrical circuit...
AUTOMATIC EMERGENCY LIGHT
This emergency light has the following two advantages:
1. It turns on automatically when the mains power fails, so you need not search it in the dark.
2. Its battery starts charging as...
Anti-Sleep Alarm
Most of the accidents on highways during night occur due to drivers’ poor vision caused by the continuous exposure of their eyes to the bright light from the headlamps of approaching...
USB LED Night Light
A typical USB LED bulb shown in Fig. 1 is a 5V, 5W USB-powered solid-state lamp. At the heart of this light bulb is a circular aluminium PCB made with a...
Smart Exhaust Fan Switch
Exhaust fans in washrooms can be connected to the lighting circuit so that these switch on and switch off with the electric light. But as washrooms are sometimes used only for...
Electronics Projects: How to Build a Lid-Monitoring Sensor Module
If you need a lid monitor sensor system for an application, this is the circuit you have been looking for. One application for such sensors would be in the security market....
Simple Tester for 74xx04 and 74xx14 ICs
The integrated circuits (ICs) 74xx04 and 74xx14 are very frequently used and reused during circuit design. Here xx stands for HC, HCT, AC and LS, etc. Sometimes, the internal inverters of...
Microcontroller Projects: RGB Colour Generator
Presented here is a red, green and blue or RGB colour generator using AT89C2051 microcontroller (MCU). This is a simple and low-cost circuit for a multiple colour generator that can be...
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Use MQTT Protocol In Smartphones And Raspberry Pi
The article demonstrates the use of Message Queuing Telemetry Transport (MQTT) protocol in smartphones and Raspberry Pi.
MQTT,...
Simulate Smartphone Screen Lock/Unlock Application
An Android phone allows itself to be locked/unlocked using a password, pattern on a grid of nine...
Creating Game Using Python Within Ten Minutes
Have you ever wondered how video games are created? It is not as complicated as you might...
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