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Transistors UHF tuner circuit

2016-05-07 03:49  
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Transistors UHF tuner circuit
In the circuit, the adjustable prestage is composed of transistor AF279, and the natural oscillation mixer stage consists of transistor AF280. The power circuit is installed on the board with copper coating. The main coil data:L1, L3, L8, L9: eight turns, the coil uses 0.35mm copper enameled wire with diameter in 3mm;L2 : 3 turns, L10 : 15 turns, L11: 15 turns. L2 , L10, L11 use 0.35mm copper enameled wire with coil diameter in 4.3mm.L12: 5 turns , L13, : 4.5 turns . L12 , L13 use 0.35mm of copper enameled wire with coil diameter in 3.5mm.