This sound relay or Vox was found in 70s RCA documentation. SCRs can be common types today and transistor a BC558. The circuit is for the 110V power grid.
This indicator circuit used and game machines (arcades) to indicate that the machine is being...
We found this configuration in a 1974 technical documentation. It can test both TTL logic circuits and...
We found this circuit in a 1997 documentation. Its purpose is to turn a load on or off using...