Found in a Popular Electronics from the 90's, this circuit can generate frequencies according to the values of the employed components, according to the table next to the diagram.
I found this circuit on a December 1976 Radio Elettronica. The Italian magazine no longer exists, but...
We found this circuit in the 1977 National Semiconductor Audio Handbook. The circuit produces a...
In the figure we have the basic configuration of a regulator for 12 V x 1 A suggested by Motorola in...