This circuit, obtained from old documentation, doubles the frequency of the pulses applied to the input. The circuit must be powered by a voltage of 5 V.
This circuit keeps the neon lamp on for a moment when it receives a pulse. The turn on time...
This circuit was found in General Electric's 1965 documentation. It appears elsewhere on the site....
This configuration was found in a 1990s documentation. Modern operational amplifiers can be used...