This circuit is temperature stabilized. Modern equivalent transistors can be used, and the power supply can actually be between 9 and 12 V. The circuit is from an old documentation.
The circuit presented is based on the National Semiconductor's LM3524, a component not common...
This circuit was obtained in an old American publication from 1974. The supply must be made with 5 V...
This configuration can be made based on other operational amplifiers. For other frequencies, the...