Monday, January 23, 2012

Wireless Microphone Transmitter Receiver circuit

This transmitter receiver circuit is for wireless microphone. The circuit divided into two section are transmitter and receiver section. This is useful for they want to know more about transmitter receiver technically and be able to use for audio spy.

Transmitter Section
This wireless headphones transmitter assures a quality reception over 2 meters. The oscillator frequency is between 1750KHz and 3500KHz and for antenna we use a ferrite bar. IC1 amplifies the audio signal and TC1 is a buffer. D1 signals that the transmitter is on and is a voltage stabilizer for the oscillator .
L1 is a toroidal core T50-2 with 80 turns, 0.2mm Ø. L2 requires a 10-20cm ferrite bar, L2a has 3 turns, 0.6mm Ø coiled at ground end of L2b wich has 30 turns, 0.5mm Ø .

The current consumption of the wireless transmitter is 150mA and is to be used with  wireless headphones receiver.

Receiver Section

The wireless headphones receiver presented is an standard application of ZN415 produced by Ferranti (short wave receiver). ZN415 assures a quality reproduction, has a 1.5 battery alimentation and contains a MA detector and audio amplifier.

 The current consumption is  5mA, L1 has 40 turns, 0.2 Ø copper and 20mm Ø ferrite. C1 is adjusted with an non metal screw, the reception frequency of this wireless headphone receiver is between 1.7MHz and 3.4MHz – shortwave receiver. This wireless receiver is to be used with wireless headphones transmitter.

Source: Wireless headphones transmitter circuit schematic

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