Saturday, February 16, 2019

How to use a relay

A relay is an electrically operated switch. Current flowing through the coil of the relay creates a magnetic field which attracts a lever and changes the switch contacts. The coil current can be on or off so relays have two switch positions and they are double throw (changeover) switches. The relay's switch connections are usually labeled COM(POLE), NC and NO: COM/POLE= Common, NC and NO always connect to this, it is the moving part of the switch. NC = Normally Closed, COM/POLE is connected to this when the relay coil is not magnetized. NO = Normally Open, COM/POLE is connected to this when the relay coil is MAGNETIZED and vice versa. A relay shown in the picture is an electromagnetic or mechanical relay.

Remote operated switch DIY kit

Description: Here's a simple do-it-yourself (DIY) remote operated switch. You can use this simple kit to switch ON/OFF any appliances working on 220V AC. This...

Fully assembled clap switch for 100-220V AC light bulbs

This fully assembled sound/clap operated switch can be used for turning on your 100-240V AC light bulbs. Usually, we use a clap switch to...

Dark Sensor using 741

We can see how can we make heat sensor from dark sensor.

Digital Object Counter using LDR and digital IC

555 timer configured in monostable mode is a simple automatic dark sensor circuit that gives output when light falling on LDR is blocked.

Latch-up circuit using 555 and opto-coupler

Here's a simple latch-up circuit using 555 timer and opto-coupler MCT2E. You can also use PC817 in place of MCT2E.  The NE555 timer is...

Connecting electrical appliance to DIY remote operated switch

This tutorial is related to my DIY remote operated switch kit. If you have come to this page from a search engine, please visit...

Sensor Alarm using thyristor- Basic electronic project

This is a simple RC circuit using thyristor. You might have done similar projects using transistors. Let me provide you some of my previous...

Flasher circuit using NE555 timer- Basic electronic project

This flasher circuit is bit different from other flasher circuits published on buildcircuit.com.

Digital object counter DIY kit

This kit is based on my previous tutorial on 'digital object counter'. I had published the tutorial under 'minibread' category. Please check the tutorial. ...

How to make one transistor FM transmitter on a stripboard- page 2/2

This is PAGE 2/2 of the article titled "How to make one transistor FM transmitter on a stripboard". Go to previous page. You can buy...

CD4017 and NE555 timer experiments

You can build simple LED chaser circuits using CD4017 and NE555 timer. There are hundreds of projects in the internet for making such simple...

RC module

Description: An RC circuit is used to introduce time delay in circuits. A combination of resistor and capacitor gives a time constant. The following circuit...

Telephone misuse indicator

When the phone line is in idle condition (on hook), the full voltage of 48V DC from the exchange appears across the line. When the phone is engaged by lifting the hand set, the voltage across the line falls down to around 12V. Thus, under idle condition (48V), VR1 is adjusted to give a positive biasing voltage to the base of Q3. As Q3 conducts Q1 gets into reverse bias and stops conduction. If the phone is engaged, Q3 stops conducting due to voltage drop across the lines, and subsequently, Q1 and Q2 starts oscillating and beeping is heard. Thus, this circuit can be used as an indicator for telephone tapping and misuse by an unauthorized person.

Portfolio- Digital object counter

Originally Designed By: SAGAR SAPKOTA    (contact) A digital object counter can be used for counting objects. It can used for fun at home for...

How to make a batteryless (crystal set) radio

CRYSTAL SET The simplest radio receiver, known as a Crystal Set, consists of nothing more than a coil, tuning capacitor, diode detector, and a pair of earphones. A...

Clap switch using 3 different modules

Description: In this clap switch we use three different modules given below. It is necessary to make these three modules in order to make...

Remote operated musical bell using UM3481

This article is about remote operated musical bell using UM3481. The M348X series IC is a mask-ROM-programmed multi melody generator , implemented by CMOS technology. It...

The simplest and the cheapest FM transmitter- Do-it-yourself(DIY) kit for amateurs

Here's one of the easiest, simplest and the most popular FM transmitter for amateurs and electronics beginners. With this DIY kit, you can transmit...

Digital object counter kit- Assembly tutorial

This article is about assembly of counter module used with digital object counter DIY kit. If you have come to this page directly from...
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