Mini Tesla Coil

A Tesla coil is an electrical device invented by Nikola Tesla in 1891. It is designed to generate very high voltage, low current, high-frequency electricity.

In simple terms, it’s a machine that can create electric sparks (like mini lightning ⚡) and even transfer energy wirelessly.

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Main Components

A typical mini Tesla coil (often called a Slayer Exciter) includes:

• Secondary Coil (many turns of thin copper wire)
• Primary Coil (few turns of thick wire)
• Transistor (like 2N2222 / TIP31 / BD139)
• Resistor
• Power Supply (battery or adapter)

The mini Tesla coil works on electromagnetic induction + feedback oscillation:

Step-by-step:

1. Power ON
   Current flows through the primary coil.
2. Magnetic Field Creation
   The primary coil creates a changing magnetic field.
3. Induction in Secondary Coil
   This field induces voltage in the secondary coil.
4. Transistor Switching (Oscillation)
   The transistor rapidly turns ON/OFF, creating high-frequency pulses.
5. High Voltage Output
   Voltage increases in the secondary coil.
6. Wireless Energy Transfer
   The electric field around the coil can:
   • Light a bulb 💡
   • Create sparks ⚡

Why It Works Without Wires?

The coil produces a high-frequency electromagnetic field.
When a bulb is brought near it:

• The field induces current in the bulb
• The bulb glows without direct connection

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