A variable frequency oscillating circuit transistor

  
Fig variable frequency oscillator transistor circuit, which is mainly an oscillator, the crystal resonator and varactor circuit by the transistor diode, the output of the ampli
A variable frequency oscillating circuit transistor - schematic

fier, typically used to make high-frequency transistor oscillator. 30 MHz transistor circuit inductor LP is connected VT1 emitter circuit, it is connected in parallel and then in series with varactor diodes, and then with 75 p capacitor connected in series between the emitter and collector VT1. VT2, VT3 amplifier constituted after the oscillation signal is amplified by the VT3 collector electrode output. Changes between V - + - 4 varactor control voltage.




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