The circuit design guiding ideology can debug without any RF instrument, its performance can not be achieved the indicators of professional equipment, but its performance should be able to meet lovers experiment, audio-visual transmission effect should not be inferior to the universal machinelevel. The transmitter is composed by two parts of the m
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odulator and RF amplifier used in the circuit all the most common is the most classic circuit. The circuit structure of the RF circuits often do not have any particular place, the key is matching circuit parameters according to different operating frequency. Example, the figure is one of the most commonly used in common emitter amplification circuit. After measurement, the circuit in a 12-channel when the gain of a dozen or so decibels, as much as 50 db below 10MHz signal amplification ability. 10MHz low frequency side, the 50 db amplifier stability work. However, when you need 12 channels of 40-50 dB of gain, certainly need three enlarged, we analyze three such amplifiers to string together what would happen. Meet the requirements put on the 12 channels, a large number, but not more than 50 db. But the three amplifier put a lot of 10MHz up to more than 150 db, which is in any case can not work. One can not work the amplifier, you can obtain the required gain it Therefore, the multi-stage RF amplifier to try to curb its lower frequency put a lot more simple method is the circuit parameters are set as shown below. The one hand, the emitter capacitance decreases to reduce the gain of the single-stage low-frequency band, but the effect is smaller, and the capacitance can not be reduced too small, otherwise the amplifier circuit status will change so that you can not control. The important step is to reduce the amount 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.....
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