800Hz Oscillator Circuit

Published:2011/8/2 1:31:00 Author:Joyce | Keyword: 800Hz, Oscillator | From:SeekIC

As shown in the figure is the 800 Hz oscillator characteristic of its simple circuit, high frequency accuracy and stable output level. It consists of four-operational amplifier integrated packages A1 ~ A3 (LM324) and tuning fork SJT (YYZ-2-800 Hz). When SJT produces 800 Hz oscillation signal feedback to the two-stage operational amplifier composed of A1 and A2 ,the signal is output by feet ⑦ of A2 . Then it will become positive feedback frequency signal after going through resistance R5, SJT .The 800 Hz signal will be amplified again by one-stage A3. Then the signal will be sent to potentiometer RP`s adjustable end (Uo) by A3`s feet ⑧ to become 800 Hz sine wave signal. Adjusting potentiometer RP can meet the requirement of output level of 0 dB / 600 Ω the output level, and the adjustable scope is ± 3 dB.



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