Project Hub /Basic Analog & Power Electronics/Inverters & Converters/DIY Stun Gun Circuit on PCB

Beginner

ANALOG / DISCRETE

₹500 – ₹1,500

3 – 6 Hours

Partial Kit

DIY Stun Gun Circuit on PCB

Build a high-voltage stun gun and insect zapper circuit on a custom PCB using a flyback transformer and NPN transistor oscillator.

Originally published on CircuitDigest

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

2-Slot 18650 Holder with Protective Cover and On/Off Switch – Case Rs. 109.00
10pcs 5mm RED Diffused Light Emitting Diodes - LEDs Set Rs. 39.00
10pcs - 220 ohm 1/4 W Resistor Set Rs. 39.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

This list includes a generic resistor set as a placeholder — it is not matched to the exact value or part number this circuit needs. The correct one is specified on the original source page linked above; check it before buying.

We don't carry yet: Transistors (BC547 / 2N2222 / TIP / MOSFET)
Transformer
Custom PCB / PCB Fab
Header Pins / Terminals / Connectors
Capacitors
Diodes (1N4007 / 1N4148 / Schottky / Zener)
Magnets / Electrodes / Probes

Browse all components

How It Works

This DIY stun gun and insect zapper circuit operates by using a low-voltage DC power supply, ranging from 3V to 12V, to generate high-voltage electrical pulses. The core of the system relies on an NPN transistor oscillator setup utilizing the DS965 transistor and resistors (including the 150k and 1k values) to rapidly switch current through the primary winding of a flyback transformer. This rapid switching creates a rapidly changing magnetic field, which induces a significantly higher voltage on the secondary side of the flyback transformer. Capacitors, including high-voltage types like the 1nF/3KV, 470nF/400V, and 105/3KV units, along with a network of 1N4007 diodes, act as a voltage multiplier and storage bank to build up and smooth out the high-voltage charge. A 5.1V Zener diode helps regulate and protect lower-voltage sections of the circuit. The system is controlled via a master on/off switch and a momentary push button, with LEDs providing visual status indicators. When activated, the resulting high voltage is discharged across a conducting net, similar to those found in mosquito rackets, capable of generating powerful high-voltage sparks.

Why Build This

Create a functional insect-zapping mosquito racket or high-voltage discharge device.

Gain hands-on experience designing and populating power supply circuits on a custom EasyEDA PCB.

Explore practical discrete analog power electronics and high-voltage generation concepts using basic components.

Real-World Application

Mosquito killer rackets, insect zappers, high-voltage generation experiments.

Skills You'll Learn

discrete transistor oscillator design

high-voltage generation principles

flyback transformer operation

voltage multiplier circuit assembly

custom PCB layout using EasyEDA

Safety Precautions

Stun gun can be dangerous and can cause serious damage if not used properly; exercise extreme caution with high voltage outputs.

Technology Tags

PCB DESIGN

EASYEDA

HIGH VOLTAGE INVERTER

FLYBACK TRANSFORMER

ELECTRONICS

SOLDERING

OSCILLATOR CIRCUIT

Frequently Asked Questions

What power supply should I use to safely test this circuit?

You should use a DC power supply or battery ranging from 3V to 12V as specified in the project data.

Can I design the PCB using software other than EasyEDA?

While the project specifically utilizes EasyEDA, the schematic can theoretically be transferred to other PCB design tools, though EasyEDA is required to use the native project files.

Why are there multiple high-voltage capacitors like the 1nF/3KV and 470nF/400V used?

High-voltage capacitors and 1N4007 diodes are used together to store energy and form a voltage multiplier network that steps up the transformer's output to the necessary sparking voltage.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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