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This circuit is from a 1967 RCA SCR manual. The circuit uses components from the era that can be replaced by modern equivalents. The transformer is 12 V x 1.2 A.
Found in old American documentation, the components used are still common. The circuit directly...
Found in a 90s documentation, this circuit makes use of D1, a switching diode that is uncommon today....
This filter, found in an old manual, has characteristics of reduced overvoltage given by the graph...