This circuit was found in a 1968 RCA documentation. The circuit can be designed with operational equivalents. Input signals can be up to 6 V in amplitude and the limitation is 78 dB.
This circuit was obtained in a Popular Electronics of the 90s. The circuit uses integrated from...
This is not such a sophisticated application, as it uses the two timers of a 556 in its normal...
The frequency of this oscillator depends on the capacitor and R1 which can be changed. The circuit...