This high impedance headphone amplifier was found in American documentation from the 1990s. Any general-purpose FET can be used.
This receiver receives signals from the PX or Citizen Radio band at 27 MHz. The circuit is from an...
This circuit was found in an American documentation from the 80's. The transistor is a...
This two-transistor emitter-coupled oscillator circuit with capacitive feedback was found in the...