This circuit can be used to test crystals from 1 to 20 MHz and also has an output to measure their frequency. We found it in the November 1998 Electronics Now magazine.
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...