This circuit was obtained in the 1990 Motorola Linear Databook. The circuit uses a 139 series comparator, but other series can be used. The power source need not be symmetric.
This circuit was found in a Texas Instruments’ publication. The circuit must be powered from dual...
This circuit was obtained from an American publication of 1982, but can be easily assembled today...
This oscillator generates a sinusoidal tone of 1750 Hz determined by the twin-T. The circuit can be...