This circuit is a fun way to test how tired you are! It works by flashing an LED light really fast. You adjust the speed of the flashing. When you are well rested, you should be able to see the light flickering even at high speeds. But as you get tired the flashing might seem […]
Oscillator Circuits
Simple Audio Frequency Signal Generator Circuit
Ever wonder how to create sounds electronically? An audio frequency signal generator circuit is like a tiny sound factory. It can cook up electrical signals that our ears can hear, ranging from deep rumbles 20Hz to super high pitched squeaks 20kHz. These circuits are super useful for: Circuit Working: Parts List: Component Quantity Notes Resistors […]
Simple Electronic Muscle Stimulation Circuit
An EMS circuit is a machine that uses electrical zaps to make muscles move. It is built with various electronic parts like timers, signal makers, boosters and sticky pads. The circuit creates controlled electrical tingles that travel through sticky pads placed on your skin over your muscles. These tingles are like the messages your brain […]
Simple Acupuncture Point Locator Circuit
A device called an Acupuncture Point Locator Circuit helps find special points on your body. Acupuncture is a traditional medicine where thin needles are used in certain spots to help heal pain. These special points are called acupuncture points, or acupoints for short. They are believed to be connected to energy flow in your body. […]
Precision Electronic Rat Repellent Circuit
This gadget plugs in and makes high pitched sounds that mice and rats do not like. The sounds are too high for people and pets to hear. This is a good option if you can not or do not want to use poison. It basically shouts with sound waves that rodents hate making them leave. […]
Simple Phase Shift Oscillator Circuit using a Single Transistor
An oscillator is like a special electronic circuit. It makes electrical ups and downs, like waves on an ocean. These waves can be smooth and curvy or choppy. The circuit can control how fast frequency ups and downs happen. There are many kinds of oscillator circuits. One type called an RC oscillator uses a special […]