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Rain alarm circuit

Description. Here is a simple rain alarm circuit that produces an audible alarm when ever rain falls. The rain detector circuit is based on two transistors (Q1 & Q2) and a NE555IC (IC1). The two transistors are wired as a switch which goes on when the base of Q1 is shorted to the positive of […]

Home Circuits, USB Circuits

USB LED Lamp Circuit

USB LED Lamp Circuit Description Here is a simple USB powered lamp that can be used to light your desktop during power failures. The circuit operates from the 5 Volt available from the USB port. The 5V from the USB port is passed through current limiting resistor R2 and transistor Q1. The base of transistor

Home Circuits, Remote Circuits

Remote controlled switch circuit

In this project, let’s build a simple Remote controlled switch for appliance controlling. If you know basic concepts of electronics, this circuit is pretty easy to build and test. The core of this circuit are two IC’s – which are infra red sensor IC’s – TSOP 1738. A couple of transistors and associated components complete

Light sensing intruder alarm
Home Circuits, Security & Saftey

Sensitive Intruder Alarm Circuit

Super light Sensitive Intruder Alarm Circuit Intruder alarms are popular devices used in high-security areas as well as civilian houses to detect and alarm the presence of any intruders. There are different kinds of intruder detection alarms, some detect movements by using a laser, some use pressure variations etc.  Our intruder alarm works using an

Home Circuits, Tone generator circuits

DoorBell circuit using UM 66 IC

Doorbell Circuit Description Related Posts: Melody Generator using UM 66 Door Bell Circuit Using NE555   The main objective of the doorbell circuit is to convert electrical signals (input) into audio signals (output) with a single press of a switch. The circuit given below is a modified version of the Melody Generator Circuit, whose link

Fun & Game Circuits, Home Circuits, Industrial Circuits

Touch Switch Circuit

In this project guide, we’re building a Touch Switch Circuit using NE 555 IC. As you know, NE/SE 555 is a very popular timer IC with multiple applications in different projects. A touch switch is basically a simple switching circuit activated upon a touch. If you’re new to 555 IC, please take the time to

water level indicator
Home Circuits, Test & Measurement Circuits

Simple Water Level Indicator

This is the circuit diagram of a simple corrosion free water level indicator for home and industries. In fact, the level of any conductive non-corrosive liquids can be measured using this circuit. The circuit is based on 5 transistor switches. Each transistor is switched on to drive the corresponding LED when its base is supplied

Home Circuits

Fridge Door Open Alarm

A fridge door open alarm circuit is explained with its detailed working and circuit. The objective of this circuit is to produce an audible alarm when the fridge is left open for more than a preset time. This versatile door alarm is made possible with the use of two 555 timer IC’s. Both the 555

Home Circuits, Lighting Circuits

Automatic LED Emergency Light Circuit

An Automatic LED Emergency Light circuit is designed to turn ON when there is no adequate lighting or if the power supply is cut-off. Earlier fluorescent lights were used to build such circuits. But the use of LEDs has proven to provide adequate lighting for a longer period before draining the battery. We have developed

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