This current switch was found in a Radio Electronics from November 1957. It triggers the current determined by the electromechanical sensor, a polarized relay of the time.
This circuit generates approximately sinusoidal signals from the rectangular signals generated by a 4093...
This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The...
This circuit activates a recorder from the signal obtained from a telephone line in the service. It is...