This circuit keeps the neon lamp on for a moment when it receives a pulse. The turn on time depends on C. The transistor is of the old type, from the 60's, when the circuit was published.
The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook. The...
This circuit was found in a Popular Electronics from the 90s. The components admit equivalents and the...
This simple digital frequency meter using CMOS circuits reaches 5 MHz frequency. Input signals are...