Transistor gain meter (CB20522E)

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

Alternating Flasher (CB6252E)
This circuit, which appears at other times on this site has this version obtained in a Hands On of...
Experimental Volume Control (CB4560E)
This circuit was obtained from an Auguist 1974 Everyday Electronics magazine. The circuit is still...
Volume Expander (CB22155E)
This circuit was found in an English publication from 1989. The integrated circuits are of the...