Rane FLT 22 User Manual

Professional Audio Products Data Sheet

FLT 22 Line Transformers

FLT 22

LINE TRANSFORMERS

General Description

The Flex Series FLT 22 is a line level two
channel balancing/isolation box, expandable to
four channels as required. Each channel contains
a low distortion, high level, wide bandwidth,
nickel-core output transformer, with individual
Common points.

The FLT 22 is an easy and convenient way to
add output transformers to any line level equip­ment. The Inputs and Outputs may be configured
as balanced or unbalanced as required. All
channels are completely separate, including
isolated Common points.

The FLT 22 is the quick and affordable
answer to all jobs requiring output balancing or
isolation transformers. The #6 terminal strips
provide for maximum installation flexibility and
cost savings.

Features

• +24dBu LEVELS

• LOW DISTORTION

• WIDE BANDWIDTH

• NICKEL CORE “80” Ni

• 2 INDEPENDENT CHANNELS

• EXPANDABLE TO 4 CHANNELS

• ISOLATED COMMONS

• TERMINAL STRIP I/O

• FLEX HR CHASSIS

• 8 CHANNELS IN 1 RACK SPACE

Option-44

The Option-44 expands the FLT 22 into a four
channel model. The Option-44 consists of a small
printed circuit board with two additional line
transformers and terminal strips soldered in place.
Assembly is simple: remove the top cover, install
the board in place, and secure with the supplied
mounting screws. No soldering required; all you
need is a #2 Phillips screwdriver. The Option 44
can also be used as an inexpensive transformer
assembly without the FLT 22. When rack space is
not available, the Option 44 can be attached
almost anywhere using screws and standoffs.

Parameter Specification Limit Units Conditions/Comments

Construction Nickel Core Bobbin Wound Grade “80” Ni
Turns Ratio 1:1 Primary to Secondary
40 Hz Max Output Level +24 0.5dB dBu 1% THD Point
20 Hz Max Output Level +18.5 0.5dB dBu 1% THD Point
Load Loss 0.5 0.1 dB
DC Resistance 200 10% Ohms Primary & Secondary
Frequency Response 20-20kHz 0.1 dB +4dBu
Bandwidth 60kHz -3 dB Half Power Frequency
THD + Noise less than .005 .001 % +20dBu; 100 - 20kHz

less than 0.15 .05 % +20dBu; 30-100Hz
Option 44 Dimensions 1.1"H x 3.8"W x 2.9"D (2.8cm x 9.7cm x 7.4cm)
Shipping Weights 5 lbs/1 lb (2.3/0.5kg) FLT 22/Option 44

1. All specifications measured with 25 ohm source and 10k ohm load.

2. 0dBu = 0.775 volts.

FLT 22

Professional Audio Products Data Sheet

LINE TRANSFORMERS

Rear Panel Block Diagram

Application Information

The FLT 22 fills the need of
adding output isolation balancing
transformers to any line-level
equipment. It is a convenient alterna­tive to the expense and clutter of
adding loose or in-line transformers.
The following is a quick guideline for
using the FLT 22.

Mounting

The FLT 22 is packaged in a
standard Rane Flex chassis which is
compatible with all HR products and
accessories. When used with other
Flex products, the FLT 22 may be
mounted in the FVR 10 Vertical
Rack. Alternatively, choose one of
the horizontal mounting kits to mount
one or two units side-by-side into a
standard 19" rack. Note that two units
equipped with OPTION-44s and
mounted horizontally provide 8
channels of transformer output
isolation in only one rack space.

Chassis Grounding

A tapped hole for a #6-32 screw is
provided for chassis grounding

purposes. Good practice dictates earth-grounding the FLT 22.
If the grounding integrity of the rack screws is in doubt, then
run a wire from this tapped hole to a known good ground.

Wiring

No special instructions are necessary when wiring the FLT

22. Use high-quality wire and choose the grounding method
appropriate for the application. A separate COMMON
terminal is provided for each channel. This terminal has no

internal connection. It is provided strictly as a wiring conve­nience. Normally, this terminal is used for tying shields
together, or connecting the (–) Input with the signal common
or shield for unbalanced inputs and/or outputs. #6 terminals
accept spades or bare wire.

Option 44

The Option 44 installs easily in the blank side of the FLT
22, thereby turning it into an FLT 44. Three screws are
provided for internal mounting. Used as a stand alone unit in
situations where another rack space is not available or for cost
considerations. Screws and standoffs may be used to mount
the circuit board to almost any surface.

© Rane Corporation 10802 47th Ave. W., Mukilteo, WA 98275-5098 TEL[phone] FAX[phone]

Printed in the U.S.A. on Recycled Paper

All features & specifications subject to change without notice 520-195 JUN94