This circuit is from a Radio Electronics magazine from May 1986. Observe the voltages applied to the capacitors, taking care that the capacitor under test can withstand them.
This circuit was found in old documentation and can be implemented with other operational...
This circuit is from Motorola's Linear Interface ICs from 1993. The circuit uses a booster...
Found in a 1970s American publication, this circuit is intended for color TV video signals. The main...