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 test circuit was found in the PE Hobbyst Handbook in a 1990s edition. The circuit tests the...
Although ECL logic is rare (no longer used), this circuit from a 1992 documentation shows how to...
Found in the April 1995 issue of Electronics Now, this circuit operates at a lower frequency than...