Wien Bridge Oscillator (CB8093E)

This circuit was found in a Popular Electronics from the 90s. Transistors admit equivalents, as well as the operational.

Simple integrator (CB20992E)
This circuit is from a Popular Electronics from the 90's. It can be implemented with equivalent...
Airflow Detector (CB5168E)
This circuit takes advantage of the temperature variation of the component with the air flow that...
Sine and Cosine Oscillator with the 741 IC (CB9513E)
This circuit generates sinusoidal and cosine signals of 2 kHz given basically by the values of C1...