The two circuits introduced here have good performance and are suitable for DIY. The two 100kΩ resistors and two 1600pF capacitors in the figure determine the oscillation frequency of the RC series-parallel frequency selection circuit. The calculation formula is f=1÷(6.28×R×C). The frequency selected by the RC circuit in the figure is 1000Hz. One thing to note is that the values of the upper and lower resistors and capacitors in the series-parallel network must be the same. Schematic diagram of the Wien bridge low-frequency signal generator:
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