This is an integrated clock circuit from the time and was published in the November 173 Radio Electronics magazine. The circuit uses an AE7218 as a base for restorers.
This configuration, explored several times on this website, shows how to use a 3-terminal voltage...
This circuit is from a 1967 Triplett manual. The circuit uses components of the time, the common...
Applications for this circuit include hearing aid, stethoscope, etc. Transistors are general...