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下图是采用运放组成的文氏电桥振荡器电路图,输出15-150KHz的正弦波。运放采用LF351,由于LF351比较难找到,也可采用TL071,TL081等运放。 通过选择不同的电容,分四档可调。 第一档输出范围:15Hz-150Hz 第二档输出范围:150Hz-1.5KHz 第三档输出范围:1.5KHz-15KHz 第四档输出范围:15KHz-150KHz Here is Circuit classic Wien Bridge oscillator using an Op-Amp covering a frequency range of 15 to 150kHz in four switched steps. Two conditions exist for a sinusoidal oscillator. Regenerative or positive feedback, and a closed loop gain of unity. The losses in the wien feedback circuit, are such that the open loop gain of the amplifier must also exceed 29. In this circuit the gain is provided by a FET type op-amp. I have used an LF351, which may be hard to obtain, but the TL071CN or TL081CN may be used and have a faster slewing rate than the LF351. The Maplin order codes are RA67X and RA70M respectively. The wien network is a parallel combination of resistor and capacitor, in series with a serial R-C network. Regenerative feedback is applied from the op-amp output, to the serail R-C input and continues. Stabilization is required to prevent the otherwise uncontrolled oscillation from building up and becoming unstable. 这里是电路经典的文氏桥振荡器使用一个运算放大器频率范围涵盖了15至150kHz的切换在四个步骤。 [url=http:///uploadfile/2010/0525/20100525010540573.gif][/url] |
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