This device is used to photograph moving objects by triggering a camera or flashgun when one or two light beams are interrupted. It was designed to capture insects in flight, but can also be used for projectiles and anything else that moves too fast or irregularly to be photographed by hand. It cost around $30 to build, and was used to make The Ba
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rista Collection. There are several commercial triggers available (a good example is The Time Machine ), but they all have a single beam that fires the camera when interupted, anywhere along its length, whereas this device has the option of having a second beam perpendicular to the first, so that the triggering area is much smaller, resulting in fewer out-of-frame subjects. Plus it`s a lot cheaper, and can be modified to perform more specialised tasks. You can see the circuit diagram here. Putting it together probably needs some experience in electronics, and if you find it too ambitious, try the CamTrigJunior. If you have trouble finding the IPL530 (DAL), try these guys, or replace that part of the circuit with a phototransistor as used in CamTrigJunior. To use the trigger, connect the sensor cable to the 8-pin DIN socket (11), and position the sensors in an appropriate place. Then shine a light source at each of the sensors, preferably with a fairly narrow beam width. LED lamps work well if the background light levels are low, and these can be powered by plugging into socket 12 of the box. Otherwise pocket laser pointers are excellent sources. Now adjust the sensitivity of sensor A (2) so that with the beam uninterrupted, the red trigger-confirmation LED (4) is just illuminated. Interrupting the beam should then make the LED go out. If it does not, turn the dial anti-clockwise a little more, whilst still keeping the LED...
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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