The circuit presented is a Japanese commercial radio for AM with 50 mW of output power, powered by 9 V. The circuit is from the 60s, having been found in documentation of the time.
We found this circuit in an old publication. The circuit can be implemented with modern equivalent...
This circuit with transistors from a 1995 publication. The circuit is powered by a voltage taken...
This tiny photocell-powered audio oscillator was found in a book on transistors from the 1960s. The...