This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
This 1.2 to 32 V x 3 A regulator was found in an 80's EDN. The power components must be equipped...
This is a typical common emitter amplifier stage configuration. The transistor can be used...
This configuration was found in a publication for radio amateurs in 1975. It is a signal strength...