fm amplifier circuits
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VN66AF 27MHz CB amplifier
Nov 19th
The 10 meters 27MHz CW radio amplifier is equiped with VN66AF transistor produced by Siliconix wich has some advantages: its cheap, great dielectric insulation and high gain. Here we use VN66AF as an rf amplifier for 10m band (26 … 30 MHz ). (more…)
RF Fm 88-108 MHz radio amplifier BLF 245
Nov 5th
This fm 88-108 Mhz radio amplifier is equiped with BLF 245 and can be user with a heatsink from a processor and cooler.
The BLF 245 Datasheet can be downloaded over here -> blf245-datasheet (more…)
88 108 MHz 40W wideband power amplifier MRF171A
Oct 24th
One wideband fm power amplifier designed with MRF 171A MosFet transistor. The output rf power is somewhere around 40W , the gains is 20dB ( 100 X ) . The input rf power is 400mW. (more…)
Rf power amplifier 100W BLY94
Oct 19th
100W RF power amplifier circuit built with 2 BLY94 transistors. If you want to see more rf amplifiers check the list bellow. Components: Active components: BLY94 Coaxial cable length : K x Lambda / 4, where K = 0.66 for 50 ohm cable and K = 0.8 for 75 ohm cable. (more…)
FM radio amplifier 25W
Oct 17th
A simple 25W fm radio amplifier used as a final stage for a 2.5W transmitter. I has a total gain of 10 dB and needs a 12V / 3A power supply. It is equiped with KT925W or BLY88, BLY89C. Use a very good headsink because this transistor get very hot :) (more…)
Rf 15W – 30W power amplifier KT922, KT930, KT934
Sep 29th
This rf amplifier ensure the power you need to boost a small transmitter. Depending of input rf power, power supply and transistor, this amplifier can boost from 15W up to 30W. The most important components : 7805, 1N4001 diodes mounted in series, 120 ohm / 2W resistor and 1N4145 diodes. The setup : trim P (220 ohm ) untill you obtain 50mA thru T1 and 100mA thru T2. Without any input signal you must measure 1.5V like in the schematic, if the voltage is higher the 2 transistors can burn. At 12V and 0.1W input rf power the output is More >
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