This receiver with earphone listening for the medium wave range was published in Radio Electronics magazine in February 1958. The circuit was powered by a 15 V battery.
We found this protection circuit for the power supply in a 1992 documentation. This circuit has...
This circuit was found in a 1977 Signetics manual. The 556 consists of a 555 double and the...
This traditional configuration of astable was found in a 1965 documentation. Transistors can be...