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 circuit makes use of an integrated LM2907. The circuit is from an old documentation being...
This sensitive signal follower with an LM386 integrated circuit can be used in both audio and RF...
This transmitter, found in Raytheon documentation from 1957, has a range of a few meters. L1 can...