Introduction: It is not any real perpetuum mobile, source of free energy from the atmosphere or anything like that, but it is, especially for beginners and enthusiasts of alternative energy sources, an unusual and very interesting experiment :). This device allows you to produce electricity from heat of burning candles or any other h
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eat source (burner, central heating, boiler, radiator. ). The conversion of thermal energy into electricity is utilized by Peltier cell (thermocouple). It is a reliable method without using any moving parts (unlike the thermal power plants). Although power is not high, it is sufficient for many small battery appliances. The principle of the device is simple: If one side of the thermocouple is warmed and the other cooled, thermocouple generates an electrical voltage. (The cooling is neeeded as the second law of thermodynamics says no machine can only work by being heated - simply told) Heating is provided by candle. Cooling is provided by a large passive heatsink from old CPU. Cooling fan would probably not be possible because its consumption is likely to exceed the power of the generator. The greater the temperature difference, the greater the output voltage thermocouple can provide. I am usind a M-TEC1-12710 thermoelectric cooler (TEC), but can use other types. Here it operates in reverse mode. I built two prototypes, the first creates a voltage about 0. 8 V in stable state. Second prototype generates around 0. 9 - 1V and short circuit current to almost 0. 5 A. The voltage is too small to be used directly to power appliances, but it can be increased by the inverter. To test the generator, the joule thief inverter with LED was used - it starts to operate from 0. 4 V. To power other appliances the circuit on schematic...
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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