We know, the maximum coverage of RSR232 serial port Transport Protocol is 10M, and the wire transmission, this needs remote transmission control to bring very great inconvenience for some. According to the needs of subject, we have designed one kind because of ultrahigh frequency above 300M Wireless for transmission method, connect result of
Click here to download the full size of the above Circuit.
uses actual with fine, can general transmission and controllings satisfied, can be used in computer, one-chip computer dispatch control field. Require higher occasion as to the bit error rate, propose adopting CRC code to reduce the bit error rate. There are amplitude modulation, frequency modulation and phase modulation in the common simulation modulation mode, the common digital modulation method has frequency shift keying, amplitude shift keying, etc. OOK modulation mode although the characteristic is discrepancy, it is easy for the circuit to realize briefly, have steady operation, used in wireless guarding against theft and security personnel field extensively. Such as the car, motorcycle alarm equipment, the warehouse gate, and in family`s security system, mostly use this type circuit. See Fig. 1 What the Er early projector used is LC resonator, but this circuit is influenced by distribution parameter too big, creep is comparatively serious, stability is not good, and it is complicated to debug, has not basically used now. Fetch and treat new device of high stability, a common one have saw filters, ceramic resonator, etc. It is very extensive to apply the saw filter in high-frequency telecommunications. This kind of electric-wave filter is small, light, what center frequency can be made is very high, the relative bandwidth is relatively wide, have frequency-selecting characteristic of the rectangular coefficient of...
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: