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.
We found this configuration in the ON Semiconductor thyristor manual. The triacs depend on the...
This circuit was found in an old documentation. It converts DC voltages and its maximum current...
This circuit makes use of comparators and common operational amplifiers, having been found in...