Wireless Mic

Introduction

Here i have designed a circuit for making a wireless mic set. The mic is actually an FM modulator. The speaker set should have an amplifier and it is attached to a Fm receiver circuit. Therefore the signals from the mic are frequency modulated and are transmitted to a wide range. Then the fm receiver circuit will receive these fm signals and are amplified by the amplifier in the speaker set.

Fm Transmitter section

Description

       Circuit showing a fm transmitter.Here i have used a bc494 high frequency transistor for making this circuit .The fm modulator is changing the frequency of carrier signal according to the strength of information signal


Component Required

1. Resistor     :  39k.100R
2. Capacitor : 10MF,2.2PF,4.7PF-2,102PF,103PF
3. Transistor : BC 494
4. Inductor : 22nH

Fm receiver section

Description

                  Circuit showing a fm radio receiver .Here i have used ic cxa1619bs for making this circuit.Construct this circuit on a good pcb and give me your comment.Part list and applications are showing below


Part List

Component No:    Value    Usage
R1    220R    Noise Reduction
R2    150R    Crystal Grounding
R3    330R   
R4    330R   
R5    330R,1/2 W      Current Limiting
C1    22pF    Oscillation
C2    22pF    Oscillation
C3    22pF    Oscillation
C4    203pF   
C5    102pF   
C6    4.7MF    Noise Grounding
C7    47pF    Feedback
C8    203pF    Noise Grounding
C9    100MF    Decoupling
C10    4.7pF    Voice Noise Grounding 
C11    104pF    Audio Coupling
L1    22nH,3T    Oscillation
L2    22nH,4T    Oscillation
L3    22nH,5T    Oscillation
X1    4.7MHz    IF Frequency Generator
X2    2.7MHz    Mixer Frequency Generator
VC1    27pF Gang    Tuning
U1    CXA1619BS     Main IC