This circuit digitally counts input pulses. The circuit from a November 1970 Radio Electronics uses unijunction programmable transistors. Note the counted pulse duration.
This capacimeter was obtained in European documentation from the 1980s. The indicator instrument, a...
This circuit for the logic control of the 555 in a power supply was found in the October 1989...
This configuration with the LM111 was found in your factory manual. The circuit can be implemented with...