A `video-digitiser` (also known as a `frame grabber`) captures still pictures frames from a TV set, video camera, or video recorder, etc. , and forwards them to a computer for display, storage, or general manipulation. This document describes the MarkII version of a home-built digitiser which interfaces to an EPP parallel port on IBM PCs. MkII supports colo
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ur captures (PAL/NTSC decoding in software). Note: the Bt218 chip, around which this project is based, ceased to be manufactured during the year 2000. If you want to build this project as shown, ensure you can get some old stock! Alternatively, you could adapt the circuit to work with a different low-cost ADC, such as the TDA8703 from Philips. I have not done this myself yet, so cannot offer details. Any PC hardware capable of running the operating systems mentioned should run the software adequately, though as always, a faster PC will often result in better performance. In particular, colourisation will be very slow on anything sub-Pentium! An EPP-type parallel port is required (though with software modifications, a simple bi-directional port would be useable, with poorer speed) Still only captures one of the two interlace fields (though often the second one would lead to motion blur anyway. ). Limited by mere 256kB of buffer. Published design captures odd/even field at random, though by simple modification you could ensure one or the other is guaranteed. Digitisation clock arrangement shown is not fully phase-locked to the linesync. A proper line-locked sampling clock could quite easily be implemented as an extension to the project. In general, horizontal resolution is decreased in domestic video recording formats (and colour is really seriously degraded). Use off-air signals from a good aerial for best results! (This...
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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