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FM wireless microphone circuit

2016-11-26 09:59  
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FM wireless microphone circuit
FM wireless microphone makes use of Manifold TA7378 of FM radio. It has few external components. So it is simple to make and is stable, which is especially suitable for production of radio enthusiasts. The specific circuit for FM wireless microphone is shown in the figure. ICl (TA7378P) includes RF amplifier, mixer, buffer amplifier, local oscillator circuit and the bias voltage regulator circuit. The circuit skillfully combines internal circuits. It uses the oscillator circuit and the AFC (Automatic Frequency Control) in order to constitute a variable capacitor circuit, aiming to generate FM (frequency modulation) wave. In order to reduce external effects, it is suitable to add a buffer amplifier between the oscillations and a mixer. Finally, the RF amplifier amplifies to transmit FM radio through the antenna.