2SC1970 Making FM Transmitter ----- 2SC1970 FM Transmitter

2SC1970 Making FM Transmitter, 2SC1970 FM Transmitter Keywords: 2SC1970, FM transmit circuit diagram This FM transmitter consists of idle disassemble parts, which can be used for the frequency modulation emission of music or speech signals, and is received with a common FM radio in 2 km. The whole machine circuit is shown in the drawings. The foreign audio signal is loaded with the diode D1 after the triode TR1 is amplified. TR2 and crystal, wire volume T1, etc. constitute a 25 MHz high frequency oscillator. The modulation of the audio signal does not use the varactor diode. Instead, it is replaced with ordinary rectifier diode V06G. V06G and 25MHz crystals are removed from the old computer. The 25MHz FM signal is coupled to the lower level. In order to obtain an output of 100 MHz. The multiplication stage is composed of T3, TR4, and wire volumes. A 50MHz signal is obtained and coupled to the lower level via the wire volume T4. T5, T6, wire volume L5, etc., the signal is doubled again, obtain a 100 MHz frequency modulation signal and coupled to the excitation stage. High frequency power amplification adopts high frequency amplifier 2SC1970. Its parameter is 40V, 0.6A. Power 1.3W, frequency 175MHz. This stage collector current is 0.15A. The high frequency output signal can be connected to an antenna external transmission. The measured output power is 0.25W on the 50 load resistance. Stable reception at 2.5km in linear distance. (Editor Press: Please follow the relevant national regulations using the radio transmitter) Note: Need to merge two pictures is the complete circuit diagram.

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