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BMX SERIES III CONSOLE
starting the turntable. With the RUN line's high state fed to U2C (i.e., the turntable is running), a STOP
pulse, via R6, R7, C4 U2C and U2B will similarly cause a CONTROL pulse output, stopping the turntable.
8.5.6 WL-2 Warning Light Interface
The WL-2 Warning Light Interface (PR&E #99-143) is an opto-isolated switched AC relay designed to
illuminate external studio and/or control room warning lights. This interface has two inputs (STUDIO and
CONTROL ROOM), which are activated by 12 volt DC commands. Each input has a corresponding AC
output. For a schematic of this interface, see Section 8.6.
NOTE: The WL-2 inputs are polarity sensitive, and will not work unless connected correctly.
CIRCUITRY
NOTE: The WL-2 contains two independent relays. For clarity and simplicity, only relay K1 is described
below.
A voltage between 3 VDC and 32 VDC applied to input connector J1 energizes solid state relay K1. Relay
K1 then switches the "hot" lead (black) of the 115 VAC input to output connector J2. Switching transitions
occur during the zero crossing point of the AC source to minimize noise transients.
8.5.7 Dual Relay Interface
The Dual Relay Interface (PR&E #99-419) consists of two separately controlled relays, which can be used
for audio or control circuitry. For a schematic of this interface, see Section 8.6.
CIRCUITRY
NOTE: The Dual Relay Interface contains two independent 4PDT relays. For clarity and simplicity, only
relay A is described below.
With no control voltage applied, relay A will have continuity between each WIPER terminal and its
respective N.C. terminal. With 12 VDC applied to terminals COM and +12 V, each WIPER will have
continuity to its respective N.O. terminal.
NOTE: Relays A and B each draw .036 amps when energized with contacts rated at 2 amps at 30 VDC.
8.5.8 Cassette Skimmer Interface
The Cassette Skimmer Interface (PR&E #99-410) is used to create cassette recordings of selected console
microphone inputs. One to four Microphone Input Modules may be connected to the skimmer, which will
toggle up to two cassette tape machines from the pause mode into the record mode the instant a connected
mic module is turned ON. When the mic module is turned OFF, the cassette tape machines toggle from the
record mode into the pause mode. In this way, a recording of a personality or personalities may be created
for later review.
REVISION B
212
PACIFIC RESEARCH & ENGINEERING
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