Having wired the camera with external shutter leads I now needed a way to trip them. They needed to be tripped (i. e. connected together via a relay) at a regular interval, perhaps 2 seconds, starting at launch. I had read that a 555 timer chip configured as a multivibrator can work. I purchased Engineer`sas a timer. Mini-Notebook, 555 Timer Circuits
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and found the basis for the circuit I would need. For launch detection I chose an acceleration switch from Adept Rocketry. The acceleration switch and timer were both powered by a single 9V battery. I built and tested the circuit using a breadboard and then implemented it using a Radio Shack PC board kit (Cat. No. 276-1576). This allowed me to etch my own PC board. If you decide the make your own board for the circuit you will need a 3/64" drill bit. These can be a little tough to find but larger drill bits will make holes that are too large and make soldering very difficult. I discovered this the hard way. I also recommed a socket for the 555 IC as heat from soldering can damage ICs. The ASA3T acceleration switch is smart enough to differentiate a bump or jar from liftoff but I chose to add an arming plug (1/8" Phono plug) just to be safe. Once prepped and loaded if the timer starts accidentally there is no way to stop it before it wastes a whole roll of film. While not strictly necessary it is recomended. The Yellow and Orange wires terminate in a Dean`s connector and connect to the Camera`s shutter wires. The Red and Black pair of wires connect to the output of an Adept ASA3T Acceleration Switch. This device (shown below oriented horizontally) senses liftoff and powers the timer circuit using via the same 9V bettery powering the ASA3T. There is a POT on the ASA3T that allows it to be configured to power up the timer...
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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