Operating in class AB1, this high-fidelity amplifier was found in the 1961 RCA tube manual. The circuit has high input impedance and good gain.
This circuit can be used in tone-modulated optical remote controls or as an optical transmitter for...
This circuit sources a Constant current to a load. The current is determined by R2. In the...
This sound relay or Vox was found in 70s RCA documentation. SCRs can be common types today and...