High current buffer (CB7280E)

Suggested by Popular Electronics, it is a digital amplifier, for pulses with frequencies up to a few megahertz.

Low battery indicator (CB21619E)
Based on an Analog Devices LTC1540, this circuit consumes only 50 uA, serving to monitor the...
Field strength meter (CB6234E)
This circuit was found in a 1980s documentation. The diodes may be general purpose diodes such as 1N34...
24 Hour Multi Timer (CB16773E)
We found this digital timer circuit in a 1994 publication. The power is supplied by 12 V, which is the...