The frequency of this circuit depends on C1 and, for the indicated values, it is 1 kHz. Equivalent operational amplifiers can be used, and the power supply must be symmetrical.
This circuit can be used as a basis for the design of battery chargers with up to 1.5 A of...
Using LM3909 integrated circuits, this circuit was found in an American documentation from the...
This circuit is suggested by National Semiconductor (now Texas) in an old manual. The circuit...