This amplifier with the EL84 tube is a European commercial type from Corpim mounted on a printed circuit board. The diagram appeared in a September 1958 Radio Electronics magazine.
Only two transistors are used in this preamp for low-sensitive transducers, such as guitar and...
This circuit is from a documentation from the 70s. The transistors are types of germanium of the...
This High Side Current Monitor was found in a 2005 Linear Technology White Paper. The circuit...