This circuit uses NOR ports to generate signals up to 10 MHz, depending on the crystal. The supply can be done with voltages from 5 to 15 V and the signal generated is rectangular.
Suggested by Siliconix in documentation from the 90's, this circuit supports current equivalent...
This circuit decodes a 1800 Hz tone used in communications. The circuit is from an American...
This circuit was obtained in 1981 documentation. It is an FM transmitter that can serve to emit...