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.
ST Microelectronics STSPIN32F060x Three Phase 600V Controller This STMicroelectronics component...
Pink noise is used in musical instruments, testing of telecommunications equipment and other...
This circuit is from a 2004 documentation serving for signals from 1 MHz to 160 MHz. The antenna is...