Circuit Project Electronic

This Power amplifier is equiped with a bipolar transistor,the famous MRF317
As lots of FM amplifier application ,the power transistor is in a C class bias.
All the impedance networks (Input & Output) have been determined by using the software: Mimp.EXE.
A 9 elements low pass filter ensures that we meet at least a 60 dB rejection from [...]

This is a simple RF receiver mainly for low-distance digital radio receiver application. The analog output of this circuit should be connected to a schmitt-trigger signal conditioning circuit with a proper value capacitor (from collector of T3). L1 for 27Mhz is about 10 turns, 6 mm diameter coil body
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Input needs only several mWatts (e.g. BF900) -> 300 mWatts OUT. This schematic is a often used buffer. It’s easy to build, clean and cheap. When you want even more power, you can replace the 2N2219a by a 2N4427 or 2N3553. You can lower the output by adding a little resistor (10..47 Ohm 1/2W) in [...]