This traditional TTL configuration was obtained in a 1977 documentation. The supply must be made with 5 V and the capacitors can be changed for operation at other frequencies.
In the old original version of this circuit from 1989, the LED is common (we recommend 330-ohm...
This 1kHz filter with Q = 10 can be applied to any operator. The power supply is symmetrical and...
This circuit was obtained from the July 1970 issue of Radio Electronics magazine. The circuit...