Transistor gain meter (CB20522E)

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

Industry’s First Seven-Port USB 3.1 Gen1 SmartHub IC for USB Type-C™
USB58xx and USB59xx Devices Integrate a 2:1 Multiplexer to Support Reversible Connection of USB...
Nicad Charger for car (CB4792E)
This circuit was found in a Popular Electronics of the 90s. The resistor R4 determines the load...
Divider by 6 (CB4618E)
This CMOS circuit divides the frequency of a rectangular signal up to 2 MHz by 6. The supply...