3MHz
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18 Volts.
Audio output frequency is that range of frequencies that can be heard. For humans, that is generally considered to be the range of 20Hz to 20kHz.
The IC You speak of, commonly referred to as a 555, is a multivibrator. Simply put, it can be configured to produce voltage pulses in some order.In the case of a buzzer circuit, it is used to vibrate with a certain frequency - this frequency is then driven to the speaker and is heard as the 'buzz'. And thus, it's a frequency source.
Deviation ratio: In a frequency modulation system, the ratio of the maximum frequency deviation of the carrier to the maximum modulating frequency of the system under specified conditions
The frequency would decrease the gain and increase the output voltage