This ground-based circuit was found in 1990s American documentation. The transistor can be any general-purpose equivalent.
This power supply with only 4 components has basic full-wave configuration. The diodes depend on...
This two-band receiver capable of tuning medium waves and the 3.5 to 10 MHz band was sold in Japan...
This circuit was obtained in a 1974 documentation. It shows how to use a JFET as a low intensity...