Found in a 90’s HAM Radio, this circuit is used for an optical communications system or even audio transmission by optical fiber. The components are common.
This power supply for those who want to feed and recover 5 ¼ floppy disks was found in the...
This circuit can be powered by a voltage of only 2.5 V. Next to the diagram we have the formulas...
This simple transistor radio with only two germanium transistors was found in a Japanese magazine from...