Sine wave oscillator II
This circuit utilizes a Field Effect Transistor (FET) operational amplifier, specifically the LF351, known for its low noise and high input impedance characteristics. However, alternatives such as the TL071CN or TL081CN are recommended due to their improved slewing rates, which enhance the circuit's performance in high-frequency applications. The Maplin order codes RA67X (for LF351) and RA70M (for TL071CN/TL081CN) facilitate procurement of these components.
The circuit employs a Wien bridge oscillator configuration, which is a type of electronic oscillator that generates sine waves. The Wien network consists of a parallel combination of resistors and capacitors that determine the frequency of oscillation. In this setup, the resistors and capacitors are carefully selected to ensure stability and precision in the output frequency. The parallel RC network is connected in series with a resistive-capacitive (R-C) network, which further refines the oscillation characteristics.
Regenerative feedback is a critical aspect of this circuit, where feedback is taken from the output of the op-amp and fed back into the input of the serial R-C network. This feedback loop is essential for sustaining oscillations and ensuring that the output signal maintains its desired amplitude and frequency. The configuration allows for fine-tuning of the gain and frequency response, making it suitable for various applications requiring stable sine wave generation.
Overall, the circuit design demonstrates a balance between component availability and performance, ensuring that it can be effectively implemented in practical applications while maintaining high fidelity in signal generation.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. 🔗 External reference
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