This circuit was obtained in the 1994 National Linear Application Handbook. The circuit admits other operational ones and the transistor can be the BC558. For the FET a BF245 can be used. The power supply must be symmetrical.

This circuit was obtained in the 1994 National Linear Application Handbook. The circuit admits other operational ones and the transistor can be the BC558. For the FET a BF245 can be used. The power supply must be symmetrical.