Posted on Oct 25, 2012

Two inverters, one resistor, and one capacitor are all that is required to make a HC(T)-based oscillator that gives reliable operation up to about 10 MHz. The use of two HC inverters produces a fairly symmetrical rectangular output signal. In the same circuit, HCT inverters give a duty factor of about 25%, rather than about 50%, since the toggle point of an HC and an HCT inverter is 1 /z Vee, and slightly less than 2 V, respectively.

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If the oscillator is to operate above 10 MHz, the resistor is replaced with a small inductor, as shown in Fig. 68-4B. The output frequency of the circuit in Fig. 684A is given as about 1/l.Brc, and can be made variable by connecting a 100-KO potentiometer in series with R. The solution adopted for the oscillator in Fig. 68-4B is even simpler: C is a 50-pF trimmer capacitor.

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