REAR PANEL DESCRIPTION
1. AUDIO INPUT TERMINALS.
Attach balanced input lines to the “+”, “–”, and
SHIELD GROUND #6 terminals. To run the FVL 22 unbalanced, attach the
positive lead to the “+” terminal and leave the “–” terminal open.
2.AUDIO OUTPUT TERMINALS.
Attach balanced output lines to the “+”, “–”,
and SHIELD GROUND #6 terminals. To run the FVL 22 unbalanced, attach the
positive lead to the “+” terminal and leave the “–” terminal open.
3. PATCH I/O JACK
provides a convenient method to use the FVL 22 as an
external processor for a mixer or other device with tip = send, ring = return insert
points. Use a two conductor shielded Tip-Ring-Sleeve cable. Use of the PATCH I/
O jack automatically disconnects the terminal strip input.
4. VOLTAGE CONTROL.
These terminals are your gateway to the VCA control
circuitry. The VREF terminal provides a precise 10VDC reference voltage output.
The V1 terminal accepts a given voltage (+5 to 24VDC), which when properly
calibrated, provides maximum attenuation. As this voltage
decreases
, the audio
level
increases
. Decrease this voltage with whatever method suits your applica-
tion (Potentiometer, switch, or voltage ramp—see back page for details).
5. GROUND LIFT SWITCH
provides the ability to separate chassis ground and
signal ground. Normally, this switch should be in the LIFT position. In some
circumstances it may be necessary to move it to the opposite position to eliminate
stubborn hum and buzz problems. See the CHASSIS GROUNDING note below
for details.
CAUTION:
If you are tempted to try moving this switch with your
amplifier levels turned up,
don’t be. Always turn your amplifier levels down
before changing your grounds around
and then bring them up slowly.
6. POWER INPUT CONNECTOR.
This is the spot where the “appropriate power
supply” connects. Again, for a complete definition of the power supply, look to
the first page for information concerning the source nearest you.
7. GROUND CONNECTOR.
Since the FVL 22 is powered from a remote AC
power supply which does not carry chassis ground through to the grounding pin
of the AC cord, this 6-32 screw has been provided in case your system does not
have another earth grounding means such as through rack rails, etc. Its use or
disuse should be determined by your specific application.
