Unijunction rectangular generator (CB9248E)

Found in an Electronic Design of 1964, this circuit operates with control voltages from 0 to 12 V determining the duration of the pulses.

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Residential Alarm (CB17228E)
This simple alarm circuit was found in a 1998 documentation. When the sensors are activated, the...
Microphone balanced amplifier (CB9388E)
This circuit was found in an old American documentation. The integrated circuit used is uncommon...
Increasing the voltage of a fixed regulator (CB8476E)
Found in a 90s Electronic Design, this suggestion to have a higher voltage in a fixed regulator...