Crystal locked medium wave transmitter

Abstract

The main aim of the project is to transmit the signals in a short range within the house or in a campus and mainly the usage of this project is to make the signals more reliable and efficient to the users. The crystal used here generates the frequency signals that cover about 600 meters of distance. The system was defined to produce a low power; low cost system. The transmitter used here is an LM386 audio preamplifier, which is mainly used in the process of maintaining low voltage and low power amplifier circuitry. The proposed work transmits the voice signals and mainly in use of sending the music signals only to a short range. They transmit a low frequency signal for a higher extent. It is a reliable device with low cost and low energy consumption. The first radio was designed by the German physicist ‘heinrich hertz’ and produces a high range of frequency signals in-between two metal conductors. In olden days, many an Amplitude Modulation (AM) broadcasting systems were been at prevalence. But they have disadvantages like high cost; lose of signals, high transmission power and many more. The defined system has a great merit. This system radiates a high electromagnetic wave and an electronic system which converts low voltage ac into high frequency (radio signal) alternating current without any loss. The proposed work uses the Frequency Modulation (FM) which broadcasts and provides high efficiency and no interference between the signals. They have high transmission rate and high signal to noise ratio.