Position: Index > Wireless Circuit >

FM wireless microphone circuit with voltage regulator circui

2016-11-05 06:44  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.


FM wireless microphone circuit with voltage regulator circuit
The circuit consists of three parts: 1 . Audio amplifier section; 2 . High-frequency oscillation part; 3 . Regulators parts. The signal is sent into a base of the transistor VT1 from the microphone MIC, then it is coupled to the base of high-frequency oscillation circuit VT2 by C2 after being amplified by VT1, then it is emitted by antenna. The working frequency of this circuit is between 85 ~ 104MHz. MIC selects high-sensitivity electret microphone, VT1 uses 9013H with β ≥ 125. VT2 is 2N3866 with β ≥ 90, L1, L2 use∮ 0.71mm enameled wires with four turns and 10 turns around ordinary pen core, C4, C5, C6 use ceramic capacitors, error is ± 5 % . The three-terminal regulator uses the LM7806 power supply with 9V battery, and the circuit board can be made by yourself.