Circuit Project Electronic

This device can be very illegal if you attach an external antenna so don’t. adjust frequency by turning trimmer. It is intended only as a practical joke device
read more : http://www.next.gr/inside-circuits/
TV-and-FM-jammer-schematic-l4106.html

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
Related Links
More circuit about RF
More [...]