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Automatic Street Light Controller Circuit Diagram:

Published on 2:20 AM by Shyamal on May 20, 2013 | 0 Comment

Automatic Street Light Controller Circuit Diagram

LDR is a special type of resistance whose value depends on the brightness of the light which is falling on it. It has resistance of about 1 mega ohm when in total darkness, but a resistance of only about 5k ohms when brightness illuminated. It responds to a large part of light spectrum.


When light falls on the LDR then its resistance decreases which results in increase of the voltage at pin 2 of the IC 555...

AM Transmitter Circuit Diagram Using 741 Op-amp:

Published on 1:40 AM by Shyamal on May 19, 2013 | 0 Comment

AM Transmitter Circuit Diagram

The frequency oscillator is built with 741 Op-amp and related components. The carrier signal frequency and its amplitude can be varied using variable resistor accordance with VR1 and VR2 respectively. C1 and C2 are the main components to generate the carrier frequency.


Another part of the circuit is an audio amplifier circuit. The audio amplifier is built with 741 Op-amp and related components...

Remote Control Regulated Celling Fan Circuit Diagram:

Published on 3:10 PM by Shyamal on May 18, 2013 | 0 Comment

Remote Control

Then in pin 2 if the voltage is less than one third of Vcc, a trigger pulse is active.The pulse signal is fed to clock pin 4 of counter IC 74109. Pin 8 of 74109 IC is grounded, pin 16 is connected to Vcc and pin 3 is grounded.


The relay is connected through a fan and a regulator. It gets connected to live terminal of AC mains via normally opened (N/O) contact when the relay energizes. If we want to operate a DC 12 volt relay...

Room Securty System Circuit diagram:

Published on 12:20 PM by Shyamal on May 17, 2013 | 0 Comment

Remote Control

The main purpose of this circuit is to secure your room in night. You need not any security guard. When any unwanted person wants to enter your room in night then this circuit raised alarm. On the other benefit,


There are five separates parts in this circuit – regulated power supply, relay driver, door switching...

Touch Activated Alarm Circuit:

Published on 4:30 PM by Shyamal on May 16, 2013 | 0 Comment

Touch Activated

This is the circuit diagram of touch activated alarm system which still activated on load shedding. Alarm system will be activated when someone touch the “touch plate” which is called trigger.


In this circuit the most updated part is automatic battery activator which is made by a relay. So don’t upset on load shedding you alarm system is activated....