VARIABLE_VNEN_BRIDGE_OSCILLATOR

Published:2009/7/9 1:30:00 Author:May | From:SeekIC

A Wien-bridge oscillator can be made variable by using two frequency-determining parts that are var-ied simultaneously at high tracking accuracy. High-quality tracking potentiometers or variable capacitors are, however, expensive and difficult to obtain. To avoid having to use such a component, this oscillator was designed to operate with a single potentiometer. The output frequency, f0,is calculated from: With preset P2 you can adjust the overall amplification so that the output signal has a easonably stable amplitude, 3.5 VPP max., over the entire frequency range. The stated components allow the frequency to be adjusted between 350 Hz and 3.5 kHz.



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