Two-tone solar buzzer (CB20493E)

This circuit was found in a 1991 publication. The transistor can be a general-purpose type.

CMOS VCO (CB9434E)
This voltage-controlled oscillator generates signals from 0 to 1.4 kHz with the components...
100 W Amplifier (CB6279E)
This is one of the channels of an amplifier suggested by Westinghouse in 1970s documentation. The circuit...
24 V to 3.3 V switching regulator (CB8170E)
Found in technical documentation from National Semiconductor, this circuit provides a voltage of...