This 1 kHz circuit was found in American documentation from the 90s. The original operational amplifier consists of a double 741 at the time. The power supply must be symmetrical.
This calibrated circuit was found in documentation from the 1980s. It makes use of an integrated circuit...
This triac synchronized circuit was found in the July 1995 issue of Electronics Now magazine. The...
This high input impedance circuit makes use of two operational ones that are still common. The...