This circuit with power MOSFETs was found in a 1980s Siliconix documentation. Equivalent MOSFETs can be used, as well as other transistors. Note the symmetric power supply.
Found in a 90s Elektor, this circuit is based on a Maxim integrated circuit of the time. The...
No information is given about the transformers in this circuit suggested by Motorola in a 1968...
This circuit was found in the January 1996 issue of Electronics Now magazine. The circuit is...