Wien bridge oscillator schematic

This is a simple scheme for a bridge oscillator. It provides a nice sinusoidal signal. This type of oscillator uses an op-amp. The weakening of the oscillating member (R1, R2, C1, C2) is 3x. To compensate, the attenuated signal is strengthened. From this, the op-amp with feedback is used to provide a gain of 3. To start the oscillation, the initial gain is higher. Once a certain voltage is reached, the diodes conduct. This will reinforce the signal so that it is not too heavy and not too distorted; sine waves will be produced. The values of R1, R2, C1, and C2 together constitute the frequency.

C1, C2 = 25V 4.7 µF
C3, C4 = 0.1 µF
R1, R2, R5 = 10 kΩ
R3 = 1 kΩ
R4 = 2.2 kΩ
D1, D2 = 1N4148
IC1 = UA741, LM741

The bridge oscillator circuit described utilizes an operational amplifier (op-amp) to generate a sinusoidal output signal. The configuration is commonly used in signal generation applications due to its simplicity and effectiveness. The op-amp is configured in a feedback loop that allows for the necessary gain to sustain oscillations.

The resistors R1 and R2, along with capacitors C1 and C2, form a frequency-determining network. The combined values of these components will set the oscillation frequency according to the formula:

\[ f = \frac{1}{2\pi R \sqrt{C1 \cdot C2}} \]

where R is the equivalent resistance seen by the capacitors, typically approximated as R1 + R2 in this configuration. The choice of capacitors C1 and C2 at 4.7 µF allows for a sufficient time constant to produce low-frequency oscillations, while the 0.1 µF capacitors C3 and C4 serve as coupling capacitors to stabilize the circuit.

The diodes D1 and D2 (1N4148) are included in the circuit to prevent excessive voltage levels from damaging the op-amp and to help clip the output waveform, ensuring that the output remains within the desired range and maintains a clean sine wave shape. The op-amp IC1 (UA741 or LM741) is a standard choice for this type of application due to its low distortion characteristics and sufficient bandwidth for audio frequencies.

Resistors R3 and R4 are used to set the gain of the op-amp. R3 (1 kΩ) and R4 (2.2 kΩ) work together to provide a gain of approximately 3, which is necessary to compensate for the attenuation introduced by the R1, R2, C1, and C2 network. Resistor R5 (10 kΩ) can be used to provide additional feedback or biasing as needed.

In summary, this bridge oscillator circuit is designed to produce a stable sinusoidal output by utilizing an operational amplifier in conjunction with passive components to define the frequency and shape of the waveform. Proper selection of component values is crucial to achieving the desired oscillation frequency and waveform integrity.This is a simple scheme for whom a bridge oscillator. It provides a nice sinusoidal signal. This type of oscillator uses an op-amp. The weakening of the oscillating member (R1.. .. R2 C1 + C2) is 3x. To compensate, the attenuated signal strengthened.From shall be 3 times the opamp with feedback. To start the oscillation, in the early strengthening higher. Once a certain voltage is reached, the diodes conduct. This will reinforce 3 so that it is not too heavy and not uitdempt sine waves will make. The values ??of R1 + R2 + C1 and C2 together constitute the frequency. C1, C2 = 25V 4?7 C3, C4 = 0.1 uF R1, R2, R5 = 10k ohm R3 = 1k ohm R4 = 2k2 ohms D1, D2 = 1N4148 IC1 = ?A741, LM741 🔗 External reference