Sine wave generator circuit

In the previous article I have explained about signal generator. In this article I want to explain about the sine wave.

Electronic equipment in sinusoidal pattern that produces pure oscillating frequency is called as sine wave generator. Sinusoidal pattern goes down, up and down and up in smooth, consistent with rolling pattern of valleys and hills.

This device produces this kind of wave that is called as sine since it has cosine function or trigonometric sine. This device is used to generate sound effects and calibrate measurement equipment.

Standard sine wave in amplitude and frequency, often used as a signal source to check the characteristics of components, amplifier circuits and electronic devices... Sine wave depends on the characteristic and frequency of the oscillation. classified into 2 types:

- RC oscillator: Frequency depends on RC, frequency is from 1Hz-1KHz: Wien bridge oscillator circuit, T bridge oscillator...

- LC oscillator: Oscillator frequency depends on components, working frequency from 100KHz-GHz: LC-adaptive oscillator circuit...

1. Sine oscillator circuit using L - C

Mach oscillating with capacitor C1 // L1 forms an oscillating circuit L -C To maintain this oscillation, the oscillator signal is put on the B leg of the Transistor, R1 is the bias bias for the Transistor, R2 is the load resistor. To get the oscillating signal out, the coil is connected from the E Transistor pin to the ground, which has the effect of taking feedback to maintain the oscillation.

Sine oscillator circuit using L - C

The oscillation frequency of the circuit depends on C1 and L1 according to the formula

f = 1/2.p.( L1.C1 )1/2 

2. Sine oscillator circuit using quartz - type RC circuit

Electronic circuit diagram:

type RC circuit

Circuit explanation:

X1 : is a quartz oscillator, the frequency of the oscillation is recorded on the body of the quartz, when the quartz is powered up, it oscillates itself into a sine wave. Quartz usually has a frequency ranging from a few hundred KHz to a few hundred KHz. several tens of MHz.

Lamp Q1 amplifies the oscillator signal from the quartz and finally the signal is taken out at pin C.

R1 is both a power supply resistor for the quartz and a bias for the Q1 . lamp

R2 is the impedance that creates the voltage drop to get the signal.

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