This power step for relay activation was found in the 1964 RCA transistors manual. The circuit is of the NF type and the transistors admit equivalents. R4 depends on the drive voltage.
This simple circuit can be used as audio output stage for intercoms, experimental radios and other low...
This simple solar powered MW receiver was obtained from a 1974 Popular Electronics. The transistor can...
This flashlight project with a blinking light that makes it easy to find was found in the January...