This small source for low consumption projects was found in an old national documentation. The transistor is for general use and the transformer has 50 to 100 mA of secondary current.
This circuit prevents the accidental inversion of the input polarity of a source to cause damage to...
Found in a Radio Electronics magazine from September 1958, this circuit has an LDR powered by the...
This circuit was found in General Electric documentation from the 1980s. The circuit is intended...