Found in Maxim's documentation from the 90's, this circuit uses an integrated from the time providing a 12 V output from 10 to 12 V inputs.
This circuit was obtained in a 1980 publication but can still be assembled today with the 106...
Found in 969 documentation, this circuit generates sweep signals from 1 Hz to 100 kHz. The...
This circuit is from an Italian magazine Radio Elettronica of January 1977. The circuit shows how...