Variable oscillator for code practice (CB7317E)

This circuit is from Popular Electronics from the 90s. The integrated circuit is not very common nowadays.

Operational Wien Bridge Oscillator (CB12423E)
Found in a 1995 Hands On-Electronics, this circuit generates a sinusoidal signal whose frequency...
Function Generator with XR2206 (CB25311E)
This circuit was found in the January 1996 issue of Electronics Now magazine. The circuit is...
High Impedance Tone Control (CB14848E)
We found this circuit in a 1982 documentation. It uses a CA3140 or equivalent operational...