Introduction: Flyback Driver Circuit.

About: Transistors may sometimes work nice as firecrackers.


This is a instructable that contains scematic and pictures of a single transistor flyback driver.

stuff's used:

1x breadboard
1x NPN transistor (with heat sink and a fan)
1x 22 Ohm resistor
1x 220 Ohms resistor
1x transformator (or round ferrite core) with same amount of windings
1x flyback transformator
1x 12 - 15V Powersupply ( i use a battery that gives 15 volt, 400 mA)

And some wires.

Step 1: Scematic of the Driver

After i tryed the flyback driver with the primary and feedback windings on the flyback's ferrite core, i thought: *why not try to use a tiny transformator with same amount of windings to oscillate the process, and so i found out i would try it.

i think the picture is somewhat blurry cause of the size, so il point out the important stuffs here:

* The transistor must have a heat sink.

* Before you put 12 volt in, test the circuit with 3 - 6 volts, and make sure that the transistor doesn't get overheated

(I currently run the circuit with 15 V , 400 mA, and still i cannot feel any sign of heat on the transistor)

i get around 50 Kv from this.

If you have any questions, just ask.

Step 2: Pictures & Setup

Here you can see my setup.

Step 3: Sparks