15W FM RF Amplifier with 2SC2539

This is a 15W FM RF amplifier circuit which build based on RF Power Transistor 2SC2539.

2SC2539 is a silicon NPN epitaxial planar type transistor designed for RF power amplifiers in VHF band mobile radio applications.

FM RF Amplifier Circuit Diagram:

15W FM RF Amplifier with 2SC2539

Coil Specifications:

L1: 2T Coil diameter:4mm
L2: in series 6pcs Toroidal ring
L3: 4T Coil diameter:10mm
L1: 3T Coil diameter:10mm


  • High power gain: Gpe >= 14.5 dB at Vcc=13.5V, Pout = 14W and f=175MHz
  • Emitter ballasted construction and gold metallization for high reliability and good performances
  • Low thermal resistance ceramic package with flange
  • Ability of withstanding more than 20:1 load VSWR when operated at Vcc=15.2V, Pout=18W, f=175MHz, Tc=250C

Download the datasheet of RF Power Transistor 2SC2539 from te following link:

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