With the provided settings, the circuit oscillates at roughly 1k5 Hz.Ī circuit of this nature should typically generate a sinewave output since a clean audio tone is pleasant to listen to for extended periods of time. R2 - C1, R3 - C2, and R4 - C3 constitute the three parts, each of which provides 60 degrees of phase shift at a specific frequency.Īs a result, at this frequency, the three parts have a total phase shift of 180 degrees. The circuit is built around an audio power amplifier device (IC1) utilized in a phase shift oscillator circuit.Ī three-section phase shift circuit is used to provide feedback between the output and the inverting (−) input of IC1. The output level of the sine wave signal is around 500mV RMS. However, you may find a substantial level of distortion on the output sine wave output signal, which may not be acceptable for applications in which high quality sine wave is expected. This in turn avoids the possibility of high clipping and distortion on the output signal. However it works with a technique of gain stabilization which does not depend on an expensive thermistor.ĭiodes D1 and D2 are employed to minimize the closed loop gain of the amplifier as soon as the output voltage becomes higher than around +/-0.5 volts, which effectively prevents the circuit from going into a erratic oscillating mode. The next figure below shows the circuit design of another sine wave generator that is essentially exactly like the previous design. If the circuit is powered through genuine dual supplies, then obviously, R3 + R4 tend to be unnecessary and could be eliminated. This simple sine wave generator circuit can be efficiently driven through a dual balanced power supply using the center tapped 0V supply being generated by the resistors R3, and R4. The circuit works with a least supply voltage of around 6 volts, and the the circuit can tolerate a absolute maximum 36 volts. It is possible to make the output frequency of the sine wave adjustable by replacing the R1 and R2 with fixed resistors and by putting a potentiometer in series, and it is certainly essential to utilize a twin gang potentiometer to ensure that R1 and R2 series values could be altered in a combined way. Having said that, you cannot use polarized type of capacitors like electrolytic or tantalum elements, and practically speaking this condition restricts the value of the capacitor to around 2.2uF maximum. For the capacitors any value in the range of a few pFs or higher can be just fine. It is recommended to have the values of the two resistors between a few kilohms and many Megohms. Modifying either the resistors or the capacitors allows an oppositely proportional variation in the frequency value. This implies that, if the operating frequency is approximately 1 kHz, then C1 and C2 could be around 4n7, and R1 and R2 could be set at 33k. The frequency of sine wave could be determined through the following formula Here, the resistor R1 value can be same as R2, and likewise C1 and C2 can also have the identical values. Nevertheless, the easy design of this sine wave generator and the an excellent sine wave output from this stabilization technique probably justifies the high cost.Īlternatively, you can replace the thermistor with a small 6 V incandescent bulb for getting the same effectĬapacitors C1, C2 and resistors R1, R2 are used for fixing the operating frequency of the output sine wave. This type of thermistor can be much costlier compared to the normal thermistors. The one downside of this circuit is the presence of RA53 thermistor which has a useful property of self heating. However, the circuit consists of thermistor Th1 used for stabilizing the closed loop gain of the circuit with a magnitude which can generate a very good quality output sine wave signal with an amplitude of around 2 volts peak to peak. The design is a simple Wien Bridge oscillator configured around an operational amplifier. The below indicated sine wave generator circuit is not only easy to build, it also provides an exceptionally pure output having a total noise and distortion level that is effectively under 0.1%. The kind of sine waveform that can be achieved from the following circuits can be witnessed in the following diagram: 1) High Quality Sine Wave Oscillator The frequency is determined by an RC feedback network between the input and output of the circuits. The 9 simple sine wave generator circuits presented in the following article are easy to build, since they incorporate a small number of ordinary electronic components, and can be used for generating an exponentially varying waveform with a specified frequency. A sine wave generator is actually a sine wave oscillator circuit which generates an exponentially rising and falling sinusoidal waveform.
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