This two-digit digital pressure gauge was found in the 1992 special edition of Radio Electronics Experimenter. A/D converter integrated circuits are uncommon today.
This circuit can source up to 1,000 V from a 9 V battery. Output current is very low, some...
This power supply uses integrated voltage regulators for 1 A of the 78xx series. The output...
This circuit appeared in Amateur Radio Today in an issue and was found in a 1995 issue. The...