A tracking mount for trusty Minolta SRT-101. My untracked photos of Hyakutake had not done the comet justice; the exposures were too short. If one mounts a camera to a sturdy tripod and opens the shutter for several minutes, the developed picture will be trailed, with every object in the frame creating a short or long streak depending on the length of the
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exposure and the part of the sky being imaged. Because of the Earth`s motion, the positions of the stars shift during any long exposure, thereby limiting the practical exposure time for a fixed camera. This limit works out to around 30 seconds for a normal wide-angle lens. Of course, very long exposures exploiting this effect have their own artistic appeal, but To counteract the Earth`s rotation and allow longer exposures, some kind of drive system is needed. If an equatorially-driven telescope is available, it can provide the tracking with the camera mounted piggy-back on the side. For beginning astrophotographers seeking a more economical approach, a barn door mount is a simple way to track a camera for wide-angle pictures. The simplest barn-door drive consists of two pieces of wood, hinged at one end. One piece is mounted to the tripod and has a threaded rod going up through the end opposite the hinge. This drive screw is turned by hand at regular intervals, or driven by a motor, to gradually push the boards apart. If the hinge axis is aligned with the north celestial pole, very near the star Polaris, a camera riding on the top board will have the Earth`s motion canceled out, resulting in sharp images of the sky. This basic configuration is sometimes called a tangent arm drive, because the drive screw and the boards form a right triangle. If the screw is turned at a constant rate, errors accumulate rapidly. A...
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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