Sine Wave Oscillator Using Transistor

Diodes d1 and d2 are used to create constant bias voltage.

Sine wave oscillator using transistor.

The pleasant code practice oscillator an amplified shaped sine wave oscillator. Initially the input at rc circuit is dc but after the first switch it is converted into sine wave and then it remains in the sine wave. Wien bridge oscillator circuit. Q2 is used as the pre amp and q1 and q3 are the speaker drivers.

You really could use any npn transistor. Previous page next page. Or use universal pcb board that difficult. Apart from the transistors all we need are resistors and ceramic capacitors.

It s a type of feedback oscillator which consists of an amplifying device like transistor as used in our circuit or we can also use an op amp. Although the circuits are is not the same. In this circuit as figure 1 the oscillator is based on the r that includes with r1 p1a or r2 p1b and c is c1 c2 or either c3 or c4 c5 or c6. Sine wave generator circuit built with a transistor.

C r sine wave oscillators usually generate signals in the 5 hz to 500 khz range. Oscillators may produce a single sine wave with a carefully controlled frequency or may output a range of frequencies by having multiple frequency controlling elements such as rc filters selected by a series of switches or keys and have their waveshape manipulated by extra circuitry for use in such systems as electronic keyboards. Although distortion levels can be higher than some other forms of audio oscillator it nevertheless provides a very convenient and reliable form of audio sine wave oscillator. 2n3904 npn transistor datasheet.

The 2n3904 transistor is an npn transistor. The circuit again is based on a simple relaxation oscillator concept using a type 2n2646 unijunction transistor to generate the audio note and commute a loudspeaker. It delineates the roles of phase shift and gain in the circuit and then discusses considerations of the op amp. The datasheet for this transistor can be found at the following link.

Setting the gain of the amplifier to offset the rc network attenuation will produce oscillation. This is a forgiving circuit and many parts values can be substituted including the transistors such as using the common 3900 types. A popular way to make a sine wave oscillator is to use an rc network to produce a 180 degree phase shift to use in the feedback path of an inverting amplifier. L c oscillators usually generate them in the 5 khz to 500 mhz range and consist of a frequency selective l c network that is connected into an amplifier s feedback loop.

The wien bridge oscillator is used in many applications to provide a sine wave signal. The simplest l c transistor oscillator is the tuned collector feedback type shown in figure.