Symmetrical Inverter (CB6647E)

This circuit reverses the signal if both positive and negative. We found it in an American documentation from 1969.

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Short Pulse Indicator (CB6697E)
This circuit keeps the neon lamp on for a moment when it receives a pulse. The turn on time...
Reversible universal motor control (CB8011E)
This circuit was found in General Electric's 1965 documentation. It appears elsewhere on the site....
Dual Limit Comparator (CB5085E)
This configuration was found in a 1990s documentation. Modern operational amplifiers can be used...