In interfacing circuitry, a receiver provides ________ input impedance to minimize loading of the input signal.

The 311 voltage comparator can operate from ________.

In astable operation of the 555 timer, the lower and upper peaks of the charging/discharging external capacitor are ________ to ________.

The frequency of the 566 VCO is set by ________.

In astable operation of the 555 timer, the external capacitor, C, is charged through external resistor(s) ________ and is discharged through resistor(s) ________.