This circuit, which can be used as a shield, was found in Radio Electronics from the 90s. The operating circuit can be replaced by a lower voltage equivalent.
Found in Popular Electronics from the 1980s, this circuit can use more modern transistors such as...
Described in the December 1969 Radio Electronics magazine, this circuit is intended to supply the...
The circuit shown enables dynamic diode testing with an oscilloscope. We found this configuration in a...