The following is a (hopefully clear) description of the final version of the trigger used and a circuit diagram for anyone wishing to construct their own. So bear with me while I fumble out some words The initial version of this trigger was a very simple single transistor amplifier, a piezo drum and an SCR. It performed well for quite a while but the need to drive
Click here to download the full size of the above Circuit.
the flashes directly (rather than from eBay radio triggers) and to have a system of delay and debounce led me to constructing a Mark II. I also did a more permanent job of the circuit by vero-boarding and casing it. There are a few circuits like this out there on the net but overall I found the quality of the designs quite poor some almost like they had never actually been built. So I aggregated a few of the designs, added some of my own stuff and came up with this. Rest assured that if you build this correctly it will work as I have a completed one myself. It is a little over engineered and several components could possibly be discarded but I desiged it with best practices in mind and following all the guidelines in the ICs datasheets. In the BOM I have indicated Jaycar part numbers for the various non R/C components. However the parts are quite common and I am sure they all can be sourced from any decent supplier or from Digikey/Farnell. Pictures of my own implementation follow to give an idea of how you might case the circuit. The case I used is a simple Jiffy type box which has the advantage of a battery compartment for the 9V cell required to power the circuit. Makes for a nice clean unit. The pots are miniature types and linear. Finer tuning in the low end could be achieved if they were logarithmic I guess it depends on your requirements as to weather that would be useful. This is the circuit on veroboard inside the...
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: