Collpitts Oscillator Circuit

Published:2011/6/21 3:33:00 Author:Joyce | Keyword: Collpitts , Oscillator | From:SeekIC

As shown in the figure is a colpitz oscillator circuit. It has a crystal with fundamental frequency of 1499 kHz. Crystal SJT is connected at the ends of capacitance C2 and C3 in parallel. Emitter divider resistances R2, R3 will provide basic feedback signals, which are controlled by capacitance dividers C2 and C3. After crystal SJT starts oscillation, it will transfer sine signals of 1499 kHz to audion VT base, and the signals will be output through emitter follower VT. Then they will go through coupling capacitance C4 to potentiometer RP. Resistance R1 would give a suitable offset voltage to VT by depressing the 18 V voltage.



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