This amateur radio amplifier circuit this inexpensive and easy to build. This circuit uses two MRF454 NPN transistors. Specified at 80 W power output-with 5 W of input drive, 30 MHz, and 12.5 Vdc.
Amateur Radio Linier Amplifier parts list : C1 : 33pF Dipped Mica C2 : 18 pF Dipped Mica C3 : 10 uF 35 Vdc for AM operation, 100 uF 35 Vdc for SSB operation. C4 : .1 uF Erie CS : 10 pF 35 Vdc-Electrolytic C6 : 1 µF Tantalum C7 : .001 pF Erie Disc C8, 9 : 330 pF Dipped Mica R1 : 100 k ohm 1/4 W Resistor R2, 3 : 10 k ohm 1/4 W Resistor R4 : 33 k ohm 5W Wire Wound Resistor R5, 6 : 10 ohm 1/2 W Resistor R7 : 100 S2 1/4 W Resistor RFC1 : 9 Ferroxcube Beads on #18 AWG Wire D1 : 1N4001 Q2 : 1N4997 Q1, Q2 : 2N4401 Q3, 4 : MRF454 T1, T2 :16:1 Transformers C20 : 910 pF Dipped Mica C21 : 1100 pF Dipped Mica C10 : 24 pF-Dipped Mica C22 : 500 µF 3 Vdc Electrolytic K1 : Potter & Brumfield KT11A : 12 Vdc Relay or Equivalent
