This circuit from a Popular Electronics from the 90's can generate signals from 0.03 Hz to 3 kHz depending on the value of the capacitor and resistor.
This circuit was found in the April 1984 issue of Radio Electronics magazine. The integrated...
The presented circuit was found in the National Semiconductor's Linear Applications Handbook from...
This circuit is basically the same as the previous configuration (CB15616E) with a power stage with...