This circuit was obtained in a 90s documentation. However, it can be developed with modern operational amplifiers. The power supply must be symmetrical.
This 2005 circuit from a Linear Technology manual makes use of the LTC610HV and an optical coupler that...
This traditional complementary circuit produces three different ones, adjusted in the...
Found in a 90's EDN, this circuit changes the phase of a signal from 50 to 60 Hz in 120 degrees. The...