Draw a labeled block diagram of sine wave generator and state function of each block. 
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Function Generator: 

This instrument can deliver sine, triangular & square waves with frequency range of 0.01 Hz to 100 kHz. 

The frequency control network is governed by a frequency dial on the front panel of the instrument 

The frequency control voltage regulates two current sources. 

The upper current source supplies a constant current to the integrator whose output voltage increases with time. 

The voltage comparator multi-vibrator changes state at a predetermined level on the positive slope of the integrator’s output voltage. 

The lower current source supplies a reverse current to the integrator so that its output voltage reaches a predetermined level on the negative slope of the integrator’s output voltage.

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