25
E-200 SERIES INTERCOM SYSTEM — EF-200 DUAL CHANNEL MASTER STATION
interruption with the PA-MIC switch will be enabled.
The factory set-up disables both program interruptions. The DIP SWITCH positions 5 and 6 in
OFF.
This configuration is additive to the program interrupt by PA-MIC switch.
PROGRAM INTERRUPT
PROGRAM INTERRUPT
WITH THE CHANNEL A
WITH THE CHANNEL A
MIC SWITCH DISABLED.
MIC SWITCH ENABLED.
PROGRAM INTERRUPT
PROGRAM INTERRUPT
WITH THE CHANNEL B
WITH THE CHANNEL B
MIC SWITCH DISABLED.
MIC SWITCH ENABLED.
8. BLOCK DIAGRAM AND HOW IT WORKS
In the following picture is shown the master station EF-200 block diagram.
The microphone input (HEADSET-2) has a DIP-SWITCH preset in order to activate the Phantom
power, going through an amplifier-limiter with the gain selectable b30 and +40 dB with an
internal DIP-SWITCH and cross a relay controlled by the master mode detector (in slave mode, the
microphone won't work connected to the local HEADSET), also this signal before crossing the
microphone is sent to the PA output through a relay controlled by the internal DIP-SWITCH presets of
the multipurpose relay activation, and an internal preset (PROGRAM OUT WITHOUT RELAY) is
provided, to make the signal going to the PA output without crossing the relay. The PA output signal is
balanced and through the optional output transformer is sent to the PA output connector.
The same relay controlled by the MASTER mode detector opens the program input signal in
slave mode after crossing the input transformer (TR2, available like option), the LINE/ MIC selector, the
input unbalanced stage and the level adjustment. The microphone and program input signals are
summed after crossing the microphone selectors (TALK A and B) and the program selectors
(PROGRAM INPUT A and B) together with the BUZZER KILL signal, with a sum circuit independent for
each intercom line and with a current source is sent to the intercom lines.
On the other hand the line signal crosses the SIDETONE filter in order to subtract (or not
depending on the SIDETONE adjustment) the own unit microphone signal, crosses the listen balance
between intercom lines and is summed to the program signal, after its level control (PROGRAM TO
HEADSET), crosses the main volume and is amplified to the HEADSET-4 pin connector.
Other relay controlled by the MASTER mode detector controls the line link in slave mode (LINK
SLAVE), so that it is only operative in slave mode. The line link A and B (LINK A+B) allows to join all the
lines of the whole intercom system.
The call switch with a current source sends signals to the intercom lines, and the call detector
circuits controls the CALL LED's and the BUZZER.
The terminal impedances can be disconnected from the lines with internal jumpers. As we
finally can observe, most of the functions and keys are controlled with a microprocessor.
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