Transistor gain meter (CB20522E)

This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the time.

CW Shortwave Micro Transmitter (CB3999E)
This microtransmitter operates at a frequency between 3.5 MHz and 10 MHz determined by the...
Phase difference meter (CB7277E)
Found in 90's Electronic Engineering this circuit can be used to measure phase angles between two...
Monostable with input lock (CB5426E)
This circuit is from an old manual, but can be easily assembled as the integrated one is still...