A camera trigger to capture transient phenomena. I had a Mamiya ZE 35mm camera and Mamiyalite ZE flash unit. Typical for bodies of its time, the only means of remotely triggering the camera was the cable release socket built into its shutter release button. This was meant to be used with a purely mechanical cable; it let you operate the shutter release from a small distance
Click here to download the full size of the above Circuit.
away, and in a manner that avoided introducing vibration to the camera at the moment a picture was taken. My solution for releasing the shutter electrically was to make a solenoid trigger. I rewound the coil of a small solenoid so that it would produce the necessary force when operated at 9V. It was a retraction type solenoid, meaning that applying current to it pulled the armature in. I wanted an extension solenoid, so I drilled a hole in the rear of it. I removed the camera end from a cable release - the part that screws into the cable release hole - and soldered it to the rear. I drilled a hole in the end of the armature, cut the pusher end off of the cable that was part of the release, soldered that into the armature, and then fed the pusher down through the solenoid and out the end of the cable release. The whole thing was light enough that I could simply screw it onto the shutter release of the camera and it would be supported without depressing the button. The other end of the solenoid was threaded for mounting in the way it was originally designed for. I found a cap that would fit this thread. This turned out to be particularly useful, because if set for automatic exposure, the camera required that the shutter release be partially depressed for long enough for it to do its calculation. If the shutter release was simply slammed down as fast as the solenoid did it, the shutter was released instantly and with incorrect...
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.....
characters left: