DALLEE ELECTRONICS 671 Quick Start Manual

11 Watt Amplifier
with true Treble & Bass controls!
This amplifier was designed to be used with
all Dallee Electronics Inc. sound systems
and may also be adapted to other systems.
The amplifier includes both Treble and Bass controls and is
designed for use with 8 ohm, or higher, speakers. Do not
use 4 ohm speakers or multiple speaker configurations
equivalent to less than 8 ohms! The amplifier is small
enough to fit most 'S' gauge and larger type trains.
Excess heat can be generated when volume is set to high
levels or with Bass set to boost so when installing this
amplifier be sure to allow for adequate ventillation and do
not place the board too close to plastic body shells. Note:
cutting Treble rather than boosting Bass results in a bass
effect with less heat being generated.
Standard round speakers are usually rated for 1/2 watt or
less and are not appropriate for use with this amplifier. Use
of heavier wattage speakers, as availble from Dallee
Electronics, are recomended.
The maximum DC input is 25 volts. Typical operation is in
the 12 to 24 volt range. If insufficient voltage is present, the
amplifier will not turn on, i.e. pass any sound to the speaker.
Output power is limited to that of the supply power.
Inadequate supply power will hamper the amplifiers ability to
perform the audio output power desired. This unit will also
shut down (turn off) if it gets too hot. Adequate cooling must
be provided if this is a problem.
Item #671
246 W. Main St.
Leola, PA 17540
(717) 661-7041
www.dallee.com
Input power connections are to be connected to the DC
source specified observing proper polarity. The input power
is not protected from reverse power to allow for the highest
audio output with a low DC input voltage. None of the
speaker connections, nor any other connection or part of the
board, should come in contact with any other connection or
metal body part. Improper connections will destroy the unit
and void all warranty.
Refer to the sound system that you are using and follow the
installation instructions.
General installation:
2x56 mounting
screw location
(3 provided).
1
2
3
Speaker connection
(8 ohms or higher)
Avoid contact to other
metals and allow
adequate air passage for
proper cooling.
INPUT CONNECTIONS
Terminal # connection
1 ................... '+' DC
2 ................... '–' DC
3 ................... audio