The basic idea is that the transmitter sends beeps and you turn the directional antenna until you get maximum signal and that is the direction of the transmitter. It doesn`t work terribly well. The reason being the antenna is quite sensitive, so even though it is directional, if the transmitter is close then you cant tell which way it is. So it only works in the sweet spot where the transmitter is far enough away for the
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signal to be smaller when the the antenna is pointing the wrong way but not so far away that you cannot get a signal at all. For us, this range was perhaps 30 to 100 yards. Its just an audio amplifier that amplifies the signal from the RF module. The module is the other half of the transmitter module and something like this. Make sure you get an AM module - that matches the frequency of the transmitter. The directional antenn is made from a piece of wood, with lengths of retractable steel ruler attached to it. The design was taken from a posting on an Australian forum that I now cannot find. But I`m sure they wouldn`t mind my repeating it here. As I mentioned the results were a littledisappointing. But then the whole project cost about 20 USD and we had some fun. Especially wandering around the neighbourhood wearing headphones andclutchingwhat looks like a home made TV antenna. This is the kind of situation where it is best to just to cultivate a wild look in the eye and hope people don`t bother you or call the police.
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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