This circuit was found in an Electronics World of 1968, making use of components of the time, not common today. The power supply is not provided.
This medium wave radio with 7 germanium transistors was manufactured in Japan in the 1960s. Its...
In this circuit the frequency is determined by the coil and the variable capacitor. Transistors like the...
This high stability circuit is from the datasheet of the component used which is not very common...