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## Electronic harmonium

Electronic Harmonium is a simple circuit that generates notes/swaras of Indian classical music system. These notes are sa, re, ga, ma, pa, dha, ni. These seven distinct notes are collectively called Sargam. This circuit demonstrates the need of electronics...

## Resistance Wheel

Resistor is a very vital electronic component used in most of the circuits. The value of resistor is marked on it in colour coded form. There is a special code to read this value. Resistor: Value reading In this activity, we will design a handy tool resistance wheel...

## Disco lights

Disco Deewane!! AH HA!! By using a simple two transistor circuit, we can make LED’s dance. Circuit Diagram This is the circuit for Astable Multivibrator. Due to continuous charging and discharging of Capacitor, the LED turns ON/OFF alternatively and appears to dance....

## One circuit: Multiple Games

In this article, we will learn to assemble a simple electronics circuit. This is not only a learning activity - you can also develop multiple games using this circuit to enjoy yourself and impress your friends. In carnivals, Diwali mela or fete, you can display these...

## Good Morning Alarm: Activity

Circuit description: We have studied the circuit diagram of Good Morning Alarm in the previous article. Here, we will learn to assemble this circuit. A specially designed PCB is used to make this circuit. Such PCBs are called special purpose PCBs. No wiring is needed...

## Good Morning Alarm

In this article, we shall learn about a simple circuit using light sensor LDR (Light Dependent Resistor). You may be surprised to know that we can sense light and incorporate electronics in our day to day life by using very simple and easy to handle components....

## Water Alarm

We have read about conductors and insulators and performed an activity to identify them in a previous article. Here, we are going to discuss a circuit which acts as water sensor by using the fact that water is a good conductor of electricity. This circuit can also be...

## Function of Resistance : Activity

Resistance: A friendly foe
Function of a Resistance
Soldering the real action
Material Required: LED, Resistance: 10Ω (Brown, Black, Black)
100Ω: Brown, Black, Brown [..]

## Function of a Resistance

Resistance: A friendly foe
Resistance with unit ohm is a component which is used to control current in a circuit. Resistance is the most commonly used component in any electronic circuit. It is part and parcel of our technology-driven life. [..]

## Variable Resistance

Resistance: A friendly foe
A variable resistance is one whose value can be varied. In some places in an electronic circuit, we have to put such resistance so that we can vary the amount of current flowing in the circuit.

## Diode : one way street

Diode is a semiconductor device having two electrodes. It is mainly made from Silicon or Germanium.
Diodes have polarity. A diode has two terminals, the positive terminal is called anode and the negative terminal is called cathode. These terminals can be identified as there is a circular ring on the cathode and the terminal without ring is anode.

## Sign language of circuit diagrams

We will try some exciting circuits in the coming blogs. The crucial skill of interpreting circuit diagrams cannot be ignored. Similar to preparing a food recipe, a crucial skill is to know the ingredients, proportion thereof and when to add in the making process as well as a power source to be low or high flame, microwave etc.[..]