This dual operational circuit of the time was found in an American 1980s documentation. The circuit has a linear output of 40 Hz to 10 kHz. The power supply must be symmetrical.
![](/images/stories/cir/223712372023_142937_0001.gif)
This dual operational circuit of the time was found in an American 1980s documentation. The circuit has a linear output of 40 Hz to 10 kHz. The power supply must be symmetrical.