This 1960s Japanese receiver uses 6 germanium transistors, being powered by a 6 V voltage obtained from large batteries. The circuit is for the medium wave range of the superheterodyne type.
This 1964 Electronic Design circuit uses a photo-FET as a sensor. The component is rare today. |...
This metal detector circuit uses an AM radio as an indicator. The radio is placed off-station and tuned...
This circuit is from a 1976 technical documentation. The FET can be MPF102 or BF245 and the coil...