Hobby Circuits - Electronics Circuits - Working Explanation

Wailing Siren using 555 Timer – Hobby Project

Aman Deep — Thu, 21 Dec 2017 07:48:00 +0000

Today we shall talk about a really amazing circuit that produces a sound of a siren. There are different types of circuits that produce different kinds of sounds. Here is a simple circuit that produces wailing siren. The main principle of this circuit is to produce a wailing siren. The 555 timer IC is operated in […]

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Mobile Phone Detector Circuit

Aman Deep — Sun, 16 Jul 2017 06:44:55 +0000

This is a very interesting hobby project which can detect active mobile phone or GSM communication in its proximity. Active mobile phone means there is some live communication is going on like calls, sms sending or receiving etc. This circuit can be used to prevent unauthorized use of mobile phones in examination halls, conference rooms […]

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LED Chaser using 4017 Counter and 555 Timer

Ligo George — Sun, 25 Sep 2016 07:06:01 +0000

Introduction A simple LED chaser hobby circuit can be made using 555 timer and CD4017 counter IC. You can use this circuit for decorative purposes. By modifying the circuit in a proper way, you can even use this to control lights working on AC mains. Components Required CD4017 Counter IC – 1 555 Timer IC – […]

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Rain Alarm using 555 Timer

Ligo George — Sun, 26 Jun 2016 10:56:28 +0000

Here is a simple and interesting hobby circuit that can be made using the popular 555 timer IC. As you might already know, a 555 Timer can be easily wired as Astable, Monostable or Bistable multivibrator. This circuit can be used as rain sensor, water overflow sensor or as a water level sensor. This circuit make […]

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Automatic Night Lamp using LDR

Arun Bhaskar — Fri, 12 Feb 2016 02:53:40 +0000

Automatic night lamp as the name suggests is for turning ON and OFF the lamp automatically without the need of human interventions. It senses the light intensity from surroundings and find whether its day or night. And it automatically turns ON when the surrounding is dark and it turns OFF when it receives light from […]

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Transformerless Capacitor Dropper Power Supply

Ligo George — Sun, 07 Feb 2016 12:22:33 +0000

I already posted about transformerless power supplies in the article, Transformerless DC Power Supply. Here we will see how to design a capacitor dropper power supply. Capacitor power supplies are simple, low cost and light weight solution for providing dc supplies to circuits which require low currents. It is low cost and light weight since there is […]

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Simple Electronic Piano using 555 Timer

Ligo George — Sat, 30 Jan 2016 06:15:54 +0000

A simple electronic toy piano can be easily constructed using the popular 555 timer IC. 555 Timer can be easily wired as Astable, Monostable or Bistable multivibrator. We all know that Sound is a Mechanical Wave as it is produced by to and fro movement of particles of the medium. Displacement of particles are in […]

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Siren Generator using IC UM3561

Vivek Kartha — Wed, 06 Aug 2014 15:49:05 +0000

IC UM3561 is a CMOS LSI IC commonly used in alarm and toy applications. It is able to generate Police Siren, Ambulance Siren, Fire Engine Siren and Machine Gun Sound just by changing simple connections. It is a low cost and low power IC which can work down to 2.4V. We need only a few […]

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UM66 Melody Generator – First Step for Electronics Hobbyists

Alisha Tomy — Fri, 30 May 2014 15:45:01 +0000

UM66 is a melody generating IC commonly used in calling bell, phone, toys, musical bell in doors, home security alarm systems, burglar alarms etc. It is a three pin IC looks like a transistor. Its first pin is ground, second is VCC and the third is the melody output. Supply voltage that can be given to […]

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IR Remote Control for Home Appliances

Abhay Bajpai — Tue, 04 Jun 2013 15:55:27 +0000

IR Remote Control for controlling home appliances can be easily made using Decade Counter CD4017, 555 Timer and TSOP1738 infrared receiver. By using this circuit you can easily control your home appliances using your TV, DVD Player remote control or using a remote control circuit described here. Remote Control Receiver Circuit Diagram 2nd and 1st […]

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