The `cold electricity` is actually RF frequency AC. When you have sinusoidal AC the voltage is half the time positive and half the time negative. On a scope you can see this, but on a voltmete
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r the positive and negative parts cancel each other out. So the meter reads zero (because the meter can not respond fast enough to show the changing voltage). The current is also half of the time going one way and the other half going the other way which causes a DC amp meter to read zero since the needle can not go back and forth as fast as the current so it just stays put. This will also cause a compass held near wire to not be effected by the AC current since again the needle can not go back and forth as fast as the current changes. The wire around the battery is the secondary of a transformer with the primary being the current flow in the battery. Current is flowing out of the battery at RF frequency. Putting a capacitor across the battery will reduce this RF current flow in the battery. Note that in many circuits high voltage spikes are being fed back into the battery which can be capacitively coupled to a plate. As the frequency of the AC increases the current flows more and more along the surface of the conductor (including you). At RF frequencies the current is only hundredths of an inch deep and not as deep as the nerves in your skin. That is why you do not feel a shock from RF current. However, if the current is strong enough it will burn your skin (called RF burns). I like this circuit allot and i am planning to make the 555 part variable so i can change frequency. But the antenna is also very nice to get things...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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