This simple source uses two 2N3055 transistors that must be equipped with good heat sinks. The source has no protection, only an input fuse. The diodes are for 5 A x 50 V or more.
Found in American documentation, this amplifier stage has unit gain and a high input impedance. It...
This circuit was found in an American documentation on transistors from the 60's. The transistor is made...
This circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...