Frequency modulation transmitter device based on Bluetooth communication

Abstract

The invention discloses a frequency modulation transmitter device based on Bluetooth communication. The mobile phone comprises a built-in Bluetooth communication transceiving module of the mobile phone, the invention discloses an HC-05 Bluetooth communication transceiver module. The invention discloses an STC89C52 single-chip microcomputer signal processing circuit. Power supply electronic switchcontrol circuit, third-stage power amplifier, the system comprises a final-stage power amplifier, a first-stage power amplifier, a second-stage power amplifier, an automatic gain AGC control circuit,a delay AGC control circuit, an MIC audio amplifier or external audio signal, a voltage-controlled oscillation and frequency modulation circuit, an OP07 active amplification circuit, an MC145152-2 frequency division and phase discrimination circuit and an MC12022AP prescaler, wherein the MIC audio amplifier or the external audio signal outputs a signal to the voltage-controlled oscillation and frequency modulation circuit; the voltage-controlled oscillation and frequency modulation circuit outputs signals to the MC12022AP prescaler and the first-stage power amplifier; and the MC12022AP prescaler outputs a signal to the MC145152-2 frequency division and phase discrimination circuit.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a bluetooth-based frequency modulation transmitter device. Background technique [0002] There are problems with FM transmitters currently available in the market: [0003] 1. All the circuits are switched on once the machine is turned on, resulting in a waste of electric energy; [0004] 2. The signal field strength is unstable. When the signal field strength drops, the receiver will be noisy. [0005] 3. Most of them adopt the traditional push-pull switch, which has a short service life. Contents of the invention [0006] The object of the present invention is a FM transmitter device based on bluetooth communication, which can reduce the waste of electric energy. [0007] For realizing above-mentioned purpose of the invention, technical scheme of the present invention is: [0008] A FM transmitter device based on bluetooth communication, comprising: [0009] Mobile phone come...

AI Technical Summary

Problems solved by technology

[0003] 1. All the circuits are switched on once the machine is turned on, resulting in a waste of electric energy;

[0004] 2. The signal field strength is unstable. When the signal field strength drops, the receiver will be noisy.

[0005] 3. Most of the traditional push-pull switches are used, and the service life is short

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