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.
The UAA170 integrated circuit is no longer common in our market. With it it is possible to...
This circuit that emits siren sound can be used in a fire alarm. We found it in an old American...
This double time constant circuit for resistive loads was found in documentation from the 1980s. The...