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will then be low. Pressing a remote OFF button causes a high output from U10D, which is routed to
U6B, causing a high output. This high is routed to U12A to reset the bistable to the off state. Further
operation of the remote OFF button has no effect.
Pressing the SOLO button causes a high output at U7A, which toggles SOLO bistable U12B with output
pin 13 high and pin 12 low. The high output from U12B pin 13 is routed through U4C to SOLO bus
drive transistor Q6. The high output of U12B also energizes SOLO relay K301. The low output from
U12B pin 12 saturates transistor Q12 to drive the SOLO button lamp. Pressing the SOLO button again
toggles U12B, de-energizing the SOLO relay and extinguishing the SOLO button lamp. Pressing either
the local or remote ON buttons will produce a high output from U8B, which will reset solo bistable
U12B.
4.10 MONAURAL OUTPUT/TELCO MIX/SEND AND RETURN MODULE
The Monaural Output, Telco Mix, and Send And Return sections of this module function independently.
The Monaural Output section is described in Section 4.7; the Telco Mix section is described in Section
4.8; and the Send And Return section is described in Section 4.9.
4.11 SLATE/TALKBACK/TEST OSCILLATOR MODULE
4.11.1 Function
The Slate/Talkback/Test Oscillator Module provides a slate tone oscillator, Talkback facilities, and a
test oscillator for the BMX III console.
Slate commentary may be added to a tape recording via the console-mounted electret microphone and/
or from a Producer's microphone. A low-distortion spotter tone (nominal 30 Hz, adjustable), with
carefully controlled envelope rise and fall times, may be recorded with the commentary for ease of fast-
wind identification of the cuts on a track.
The console and Producer microphones can Talk to any two Studios plus a remote or External location.
The External location can also Talk back to the Studios, as well as to the Control Room.
The test oscillator generates low-distortion, stable amplitude tones to allow system test and lineup with
any 15 frequencies. The tones may be assigned to any combination of the PROGRAM, AUDITION
and UTILITY mix buses.
4.11.2 Circuitry
The Slate/Talkback/Test Oscillator module contains these five major circuit sections:
• Slate Tone Oscillator
• Console Talkback Microphone/Amplifier
• Producer Microphone Input
• Test Oscillator
• Talkback
PACIFIC RESEARCH & ENGINEERING
80
BMX SERIES III CONSOLE
REVISION C
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