This circuit was found in the component's own manual, which is not very common nowadays. Note that the circuit requires the use of a symmetrical power supply.
We found this circuit in a 90's Radio Electronics. The low power circuit activates a 12 V relay...
This circuit is from 1997 Linear Technology Applications. The circuit uses common components at...
Equivalent operational amplifiers can be used on this crystal-controlled oscillator. The circuit is...