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3 - 3.5 watts FM transmitter circuit

2016-04-08 07:57  
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The following shows a 3 - 3.5 watts FM transmitter circuit. The circuit is very simple, and very practical. Recommend Duokanjibian The schematic in order to master this principle. I hope to be helpful to your work. The output power of the circuit is 90 to 110 MHz. This circuit can be combined to obtain  BLY88  amplifier 20 W output power. In the circuit: the circuit has been tested in a normal radio test test plate (one copper). Some links between the two sides. Built in RF transmitter proof casing, use good connectors and cables, shielding between the different stages, you can realize all the other RF rules of building. Q1 and Q5 should be cooled with a heat sink. The case of the fourth quarter pin should be grounded. Is the frequency adjustment C24. Other Accessories tiles must be adjusted to the maximum output power and input current with the lowest SWR.


This is the schematic of the 3W FM Transmitter


PartTotal Qty.DescriptionSubstitutions
R1,R4,R14,R15410K 1/4W Resistor 
R2,R3222K 1/4W Resistor 
R5,R1323.9K 1/4W Resistor 
R6,R112680 Ohm 1/4W Resistor 
R71150 Ohm 1/4W Resistor 
R8,R122100 Ohm 1/4W Resistor 
R9168 Ohm 1/4W Resistor 
R1016.8K 1/4W Resistor 
C114.7pF Ceramic Disc Capacitor 
C2,C3,C4,C5,C7,C11,C127100nF Ceramic Disc Capacitor 
C6,C9,C10310nF Ceramic Disc Capacitor 
C8,C14260pF Trimmer Capacitor 
C13182pF Ceramic Disc Capacitor 
C15127pF Ceramic Disc Capacitor 
C16122pF Ceramic Disc Capacitor 
C17110uF 25V Electrolytic Capacitor 
C18133pF Ceramic Disc Capacitor 
C19118pF Ceramic Disc Capacitor 
C20112pF Ceramic Disc Capacitor 
C21,C22,C23,C24440pF Trimmer Capacitor 
C2515pF Ceramic Disc Capacitor 
L115 WDG, Dia 6 mm, 1 mm CuAg, Space 1 mm 
L2,L3,L5,L7,L956-hole Ferroxcube Wide band HF Choke (5 WDG) 
L4,L6,L831.5 WDG, Dia 6 mm, 1 mm CuAg, Space 1 mm 
L1018 WDG, Dia 5 mm, 1 mm CuAg, Space 1 mm 
D11BB405BB102 or equal (most varicaps with C = 2-20 pF [approx.] will do)
U117810 Regulator 
MIC1Electret Microphone 
MISC1PC Board, Wire For Antenna, Heatsinks 


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