Audio Frequency Oscillator
The block diagram of audio frequency oscillator is shown in
the fig. the audio frequency oscillator is designed to provide an output signal
over audio frequency range. The laboratory AFO provides frequency range from 10
Hz to 100 Hz approximately.
Pic 1. Block Diagram Of an Audio Frequency Oscillator
The first block is tunable sinewave oscillator. It is the
heart of the instrument. These oscillators are of the wien bridge or phase
shift type or beat frequency oscillator. This oscillator provides with a
frequency range selector. The output of the sinewave oscillator is applied to
amplifier. The amplifier amplifies the signal generated by the oscillator. The amplifier
also provides buffering between the oscillator and any load connected to the
output terminals.