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Transistor FM transmitter schematic

2016-04-07 08:28  
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Next is the principle of the transistor FM  transmitter  display. The principle is very simple and very practical. Figure: Q1 adjustment signal and as an oscillator. L1 and C5 determine the frequency. By the hard-line or other frequency as you move the antenna. Try different lengths to get the maximum range. 50 cm or less should work reliably most of the time.

 

 

Schematic

R127k
R256k
R312k
R4100
C11u
C2, C3470p
C46 to 10p
C51-30p trimmer
L1etched on PCB or a center-tapped coil 5mm in diameter, 6-8 turns of enamel-coated wire 1mm thick
MicElectret microphone
Q12N3564, 2N5225 (other general-purpose NPN transistors will work, too)

Parts Placement
PCB

 

 


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