This 80's circuit uses a germanium transistor like the AC121. The circuit has an output transformer of the type found on many transistor radios of the time.
We found this circuit in a 1981 documentation. The circuit can still be easily assembled, as it...
This circuit was obtained in an old publication from 1979. It describes a simple low frequency...
This circuit was found in a 90's EDN. It can be implemented with either TTL or CMOS logic and used...