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.
We found this circuit in a 1998 documentation. It generates a musical melody tone obtained from a...
This circuit is from a 1997 publication. In it, the circuit uses a light emitter that points to a...
The circuit presented was obtained in a technical documentation from National Semiconductor. The...