Site icon Circuit Ideas for You

How to Build a Mini Tesla Coil Circuit

In this post for How to Build a Mini Tesla Coil Circuit these tesla coil make high voltage and low current.

Mini Tesla coil is small version of big one.

It can light small things or make tiny sparks.

It runs on 9V battery or other low power.

Circuit Working:

Parts List:

CategoryItemQuantity
Resistor22k 1/4 watt1
SemiconductorsTransistor 2N22221
Red LED 5mm 20mA1
ON/OFF Switch1
Coil on super enameled copper wire primary winding 6 turns, secondary 275 turns1
Battery 9V1

This small Tesla coil circuit have two parts switch part and coil step-up part.

L1 coil connect to Q1 transistor 2N2222 at collector pin and it act like switch.

L1 make magnetic flux when power goes in.

Winding setup is very important, we need to do winding first before starting the full circuit.

We have used 3 inch and half feet PVC pipe (size can change).

Use insulated wire for primary coil.

Also need non-conductive round material.

First make secondary coil using 22 SWG copper wire and wind 275 turns on PVC pipe.

One end of this coil connect to transistor base and other end should be left open.

After that make 6 turns for primary coil.

Battery power goes to Q1 transistor base and coil through switch.

Put resistor R1 to base pin.

We can add red LED from negative supply to base to see pulse.

Battery negative connect to emitter.

L1 coil goes to collector.

Base also connect to L2 coil.

When power is ON, Q1 stay OFF at start.

But base get little power so Q1 slowly turn ON.

Then full power goes to L1 coil.

L1 make magnetic field.

Because L2 have more turns it also make magnetic flux and gives high voltage.

This loop goes on while power is ON.

L2 flux send more power to base and make Q1 more ON.

But then base power drop because battery power flow decreases.

Q1 reach saturation means with fully ON.

Formulas:

To make Tesla coil we need some formulas and electric knowledge.

Main formulas:

1. Primary coil frequency (f):

f = 1 / (2π√LCp)

where,

2. Secondary coil frequency (f):

f = 1 / (2π√Ls(Cs + Ct))

where,

3. Coil inductance (L):

L = (N² * μ0 * A) / l

where,

These formulas help to build Tesla coil.

But we also need to think about safety, insulation and what materials we need to use.

How to Build:

How to Build a Mini Tesla Coil Circuit follow the below mentioned steps:

Safety Notes:

Conclusion:

How to Build a Mini Tesla Coil Circuit is fun for science lovers.

But always follow safety rules.

Stay away from coils when power is ON.

References:

Miniature Tesla Coil Teaching Lab

Tesla coil

Exit mobile version