This power supply circuit was obtained from the February 1993 Radio Electronics magazine. The integrated circuit and power transistors must be provided with heatsinks.
This simple circuit for switching RF signals was found in an RF Design from the 90s. The circuit...
I found this circuit in a Popular Electronics from 1992. The circuit can be easily implemented with BC549...
This circuit was found in a 90s EDN. Its purpose is to increase the efficiency of operational...