Sine Wave Generator with Bridge oscillator by LF351

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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.

Read More Source:
http://www.zen22142.zen.co.uk/Circuits/Testgear/sinegen.htm
Thank you.

This entry was posted on Saturday, February 9th, 2008 at 9:45 am and is filed under oscillator generator. You can follow any responses to this entry through the RSS 2.0 feed.