Found in a QST magazine from the 90s, this circuit broadcasts on different amateur radio bands depending on the coil. Data for the coil and crystal are provided next to the diagram.
This circuit is from 1990 documentation. When we press D1 the lamp remains on for a time interval that...
In the figure we have more circuit that makes use of transistors and that has excellent...
The VCC PML50 Panel Mount LED Indicator can now be purchased from Mouser Electronics. The new...