This circuit with 10 MHz and 1.25 MHz TTL outputs was found in an American documentation from the 1980s. The used integrated circuit is uncommon today.
This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the...
This circuit was found in a September 1987 Radio Electronics. The current through the switch is...
This old circuit, from a 1992 documentation, was used with tape recorders acting as playback. The...