TTL pulse detector and indicator (CB22414E)

This TTL circuit with the 7400 serves as a pulse indicator. It must be supplied with a voltage of 5 V.

Digital Potentiometer (CB12291E)
This digital potentiometer is from a 1993 publication, but it can be easily assembled today. R1 to...
Maxim MAX16813B 4 Channel LED Driver
Maxim MAX16813B 4 Channel LED Driver These Maxim Integrated LED drivers are available from Mouser...
Telegraph manipulator (CB7038E)
This circuit was found in an American magazine 73 for radio amateurs of the 80s. It is an...