Stuns, also sometimes called tasers, use a strong electric shock to stop an attacker. This shock is meant to be painful and scary not deadly. A short shock can make an attacker lose control of their muscles for a few seconds. This gives you time to get away. A longer shock more than a second […]
Illuminate LEDs with 1.5V Battery using this Joule Thief Circuit
This is a circuit that can make an LED light up from a dead battery! It works with white, blue and even ultraviolet LEDs, and all you need is a battery that’s almost empty at least 1.2V. The cool thing is, the LED can even light up with just a tiny bit of power left […]
Simple 220V SMPS Circuit using One Transistor
This guide shows you how to build a simple power supply circuit that plugs into the wall outlet 220V and uses only one transistor MJE13005. It does not need any fancy chips or extra parts to control the power. Instead of those parts, it uses a special diode and a winding on the transformer to […]
5 Watt LED Driver Circuit (SMPS)
This post shows you how to build a power supply to directly power bright LEDs from your wall outlet. It is made especially for white LEDs, but it can also work with other colors like blue, green, red, yellow and even ultraviolet UV. What is a 5 Watt LED Driver Circuit: A 5 Watt LED […]
IC 555 Inverter Circuit
The demand for portable power solutions is ever growing especially in scenarios where access to mains outlets is limited such as in cars, trailers or cottages. Constructing your own DC/AC power inverter provides a versatile solution to power various household appliances like radios, DVD players, electric shavers and more. What is a IC 555 Inverter […]
SMPS Halogen Lamp Circuit
SMPS Halogen lamps usually need transformers to work. This guide is about a new kind of transformer that uses a switching power supply. It is simpler than older transformers and works with other light bulbs too, as long as they do not use radio waves RF. This new design also saves energy. What is a […]