As noted in Section 126.96.36.199, talkback enables the mixer operator to communicate with the studio, and most mixers, except the smallest portable and edit suite units, have some form of talkback facility.
The minimum requirement is for an integral microphone with associated amplifier and gain control, and a ‘press to talk’ switch, the output of the amplifier being connected to the studio loudspeaker feed. This can be achieved by routing the talkback directly into the mixer output, either mixing in with the programme or overriding it via a relay or solid-state switch. As the studio loudspeaker is normally fed from the mixer output, it will receive the talkback whenever the switch is pressed; but so will the mixer output.
If the ...