This is the most simplest and single transistor FM wireless transmitter circuit that ever posted in CircuitsGallery. In telecommunication field, frequency modulation (FM) transmits information by changing the frequency of a carrier wave according to message signal. FM uses VHF radio frequencies usually 87. 5 108. 0 MHz to transmit and receive t
Click here to download the full size of the above Circuit.
he FM signals. Here I will give you theexplanations about FM transmitter, how to make a FM transmitter andhow a simple FM transmitter is designed and assembled etc. The performance and working of a wireless audio transmitter circuit mainly depends on inductor coil specification and the value of variable capacitor. Even a slight change of inductance or capacitor can shift the harmonic frequency from the VHF (88-108 MHz) band. This article will enable you to answer how to build an FM radio transmitter . Also you will get the confidence tobuild your own FM transmitter. A condenser microphone is used to accept the sound signals. Inside the mic, a capacitive sensor diaphragm is present. It vibrates according to the air pressure changes and generates AC signals. The inductor L1 and variable capacitor (trimmer) forms an oscillating tank circuit along with the transistor 2N3904. It is the common NPN transistor used for general purpose amplifications. As long as the current exists across the inductor coil L1 and the variable capacitor, the tank circuit will oscillate at the resonant carrier frequency for FM modulation. Capacitor C2 acts as a negative feedback to the oscillating tank circuit. Every FM transmitter circuit requires an oscillator part to generate the radio Frequency (RF) carrier waves. The name Tank` circuit is derived from the capacity of the LC circuit to store energy for oscillations. The modulated signal from 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: