This precision full-wave rectifier used in instrumentation was found in a technical documentation from the 1980s. Diodes are general-purpose types.
This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The...
This high sensitivity circuit was found in the July 1992 Radio Electronics magazine. The circuit...
This circuit was found in an American 80's circuit board. The components used are current except the...