This circuit was found in the May 1959 Radio Electronics magazine. Its purpose is to provide bias voltages for circuits under test. The circuit is isolated from the power grid.
Found in National Semiconductor documentation from the 90's this circuit uses a piezoelectric sensor....
Found in a 1980s Electronics Now, this circuit uses common components. Transistors are commonly...
Using the 4046 PLL we found this circuit in the December 1989 Radio Electronics. The circuit...