This is a UHF oscillator circuit I designed to make use of the Mini-Circuits POS-400+ voltage controlled oscillator chip. By giving it a voltage from 0 to 12V on pin 8 it gives out a sine wave ranging from 200MHz to 380MHz on pin 2, though my testing with a lecher line gave a range of 200MHz to 440MHz. The purpose was to use it as a frequency sour
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ce for the testatika Linden experiment under the assumption that the experiment`s long wire is a lecher line that is 1 metre long, the wavelength corresponding to 300MHz which in turn corresponds to the speed of light (approximately 300, 000, 000 metres/second. ) Basically I needed two 12VDC sources, one fixed at 12V for feeding pin 1 and one that could vary between 0 and 12V for feeding pin 8, the latter for selecting the frequency (from 200MHz to 380MHz. ) Unfortunately I didn`t have two 12VDC sources where one leg of each was connected to ground. I had a power supply that I`d built where that was the case but everything else I had had both legs floating as far as I could tell. So somehow I had to come up with a circuit that would allow my one power supply to provide both fixed 12VDC and variable 12VDC. I came up with the following circuit. It uses the fact that a single 12VDC source can be made into two separate ones by use of two parallel lines (the top and bottom horizontal lines connected to the positive leg in the above), the voltage supplied to both being 12V but the current being divided, which I didn`t care about since I had enough current. For the variable line I used the fact that voltage drops across a resistor, the bigger the resistance the bigger the voltage drop. Since I needed various voltages I used a potentiometer for the resistor (a potentiometer is a variable resistor. ) That way I could choose the size...
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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