Using the LM3909 this circuit was found in the January 1992 issue of Radio Electronics magazine. Resistor R1 should be chosen according to the table given next to the diagram.
This useful circuit is used to test the insulation of cables, appliances, leaks in high voltage...
This vibrato circuit was found in Motorola's 1966 documentation. The circuit uses transistors of the...
This circuit for analog TV was found in an American documentation from the 90s. The circuit uses an...