Category Archives: School Projects

Tip to Identify Resistors

Posted on May 10, 2010 by D.Mohankumar

Resistors are inevitable parts of Electronic circuit.For a beginner, the major task during the circuit construction is the identification of resistor values and pin assignment of transistors. Here explains the easy way to identify a resistor. Article in word format. … Continue reading →

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Prototype Construction

Posted on May 5, 2010 by D.Mohankumar

Printed circuit board, or PCB, is used to mechanically support the electronic components and to connect them electrically using conductive pathways called tracks etched from copper sheets. Besides etched PCBs, there are Common or General purpose PCBs to make temporary … Continue reading →

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IR RECEIVER

Posted on May 4, 2010 by D.Mohankumar

This circuit can operate a load such as LED, Buzzer or Relay for a period of 3 minutes through a Remote hand set. It uses the IR sensor module TSOP 1738 which operates in 38 KHz Infrared pulses.

Posted in 555 Timer, Exhibition Projects, Hobby Circuits, Home projects, Infrared, School Projects, Sensors | Tagged , , , | 2 Comments

Dancing LED

Posted on May 3, 2010 by D.Mohankumar

Here is a simple Dancing LED Circuit. The LEDs turns on/off alternately giving a dancing appearance. It is a simple Astable multivibrator using two NPN transistors.

Posted in Exhibition Projects, Hobby Circuits, LED, Light, School Projects | Tagged , | 1 Comment

Moisture Sensor

Posted on April 29, 2010 by D.Mohankumar

This circuit indicates the level of moisture in a place due to rain or spilling of water. Green LED lights when there is moisture and Red LED lights when there is no moisture.

Posted in Detectors, Hobby Circuits, Indicators, LED, Op Amp, School Projects, Sensors | Tagged , , | 2 Comments

RAIN ALARM

Posted on April 29, 2010 by D.Mohankumar

This is a simple circuit that can be used to detect rain. It will give a loud beep when the first drop of rail falls on the sensor. So it useful to detect rain where sun drying is carried out.

Posted in Alarms, Detectors, Hobby Circuits, Home projects, Monitors, Op Amp, School Projects | Tagged , , | 3 Comments

SHADOW ALARM

Posted on April 29, 2010 by D.Mohankumar

This is the circuit of a simple burglar alarm that produces a loud beep when somebody crosses a protected area or door. The circuit is highly sensitive and can detect the shadow of the moving person from a distance of … Continue reading →

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15 Top Circuits

Posted on April 28, 2010 by D.Mohankumar

15 Top Circuits added in Top circuit page.These are my circuits published in Electronics For You Magazine, New Delhi.Click Top circuits to down load MOBILE BUG

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WATER LEVEL INDICATOR

Posted on April 24, 2010 by D.Mohankumar

This water level indicator can intimate the low and high water levels in the overhead tank through audible beeps. Circuit in Word Format WATER LEVEL INDICATOR

Posted in Alarms, Circuits, Hobby Circuits, Home projects, Monitors, Op Amp, School Projects | Tagged , , | 1 Comment

HEAT SENSOR

Posted on April 24, 2010 by D.Mohankumar

This is the circuit of a simple Fire Sensor that uses an ordinary Signal Diode as heat sensor. As soon as the temperature near the diode rises above the preset value, alarm will be generated to indicate high temperature. Alarm … Continue reading →

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