Kinescope Rejuvenator (T464E)

This utility circuit for old TV restorers was found in a Popular Electronics from November 1968.

Full wave rectifier filter (CB7582E)
This circuit was found in a Popular Electronics from the 90s. The power source must be symmetrical...
Piezoelectric Driver 1 (CB21153E)
In the figure we have a circuit to excite a piezoelectric capsule taking advantage of its resonant...
Two Light Flashers (CB947E)
The circuits below were found in amarican publication of the year 1958. The transistors are...