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Automatic switch of TV sound transmitter
Related component PDF download:The main circuit of the whole machine is the common monolithic FM stereo broadcast transmission integrated circuit BAl404. Its circuit is very mature. To facilitate beginners to make their own, the coil dat...
FM wireless microphone circuit with voltage stabilizing circuit
Related component PDF download:1、 Circuit principle (see the figure below) The circuit consists of three parts: 1. audio amplification part; 2. High frequency oscillation part; 3. Voltage stabilizing part. The signal is injected into the...
A long distance FM frequency modulation transmitting circuit (500M)
Related component PDF download:The low-power FM transmitting circuit introduced in this paper, due to the use of a special transmitting tube, has deep modulation, no amplitude modulation, small distortion, long transmission distance, and...
A small fm transmitter circuit
Related component PDF download:I. Preface:Here I will introduce a simple and easy to make small FM transmitter. It not only meets the requirements of transmission distance, but also can input sound signal with microphone and line at the ...
A discrete component transmitter circuit
Related component PDF download:WBFM TX V7By Harry LythallIntroductionOk, so I have done a lot of playing around with the domestic FM bank This will probably be one of the last transmitters for the 88MHz to 108MHz band This particular TX ...
Circuit of a wireless hands-free telephone device
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A cheap wireless microphone circuit
Recently, a wireless microphone sold in the market was priced between 10 and 20 yuan. The microphone is tuned in the 88~108MHz FM band, and its transmission distance is about 30m. It can be received by any FM radio, and the received sound is clear...
A simple FM microphone (single tube)
Related component PDF download:A simple FM microphoneThe circuit (see figure) uses a capacitor feedback oscillator, whose frequency is stable and adjustable. Its feedback signal is in the form of capacitive voltage division, and the outp...
An Experimental Crystal FM Transmitter Circuit
Related component PDF download:An experimental crystal FM transmitterMany radio enthusiasts hope to make a FM transmitter, especially in the 87~108MHz FM band, which can be received by the ready-made FM radio, so it is favored by everyon...
A walkie talkie circuit
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