This circuit was found in the August 1996 Electronics Now magazine. The circuit is based on an operational circuit whose type determines the gains and limits for the frequency.
This basic configuration of voltage regulator using operational amplifier and zener was found in a...
This circuit was obtained in a 90’s Popular Electronics. The frequency depends on C1, a component...
We found this circuit in the 1990 Radio Electronics Special Projects magazine. The circuit has a...