Altec 1594B Operating Instructions Manual page 6

Figure 7. Converting t o 240V ac, 50160
Battery Connections
I f desired, the 15948 may be connected to an external
24/28 volt battery with minus
the dc power connections are on TB4 (see Figures 6 and
automatic and silent. A built-in charging circuit supplies a
100 mA trickle current to maintain battery charge during
ac operation. The battery power supply is not operated by
the primary power ON.OFF switch on the front panel, I f
switching of battery power i s desired, an external relay or
switch should be provided by the user.
lnput Connections
lnput connections may be either
transformer-isolated a t the INPUT terminal board (see
Figure 6). Direct coupling is accomplished by connecting
the input leads (shielded conductor recommended) to
terminals 1 and 2. Terminal 2 i s ground. Table I lists the
terminals and applications of the INPUT terminal board.
Table I. Terminals and Applications of
INPUT Terminal
Terminals
Direct-Coupled
1.2 (GND)
3.4
Isolated
receotacle J1 is for 600 ohms
a t
Hz Operation
as ground. Terminals for
I
For unbalanced high-imped-
For bridging unbalanced
low-impedance lines having
signal voltages of 0.8V rms
or higher
t o level of +15 dBm (with
For low-impedance line-
bridging input or 15K ohrn
line-matching input (with
For transformer-isolated input, a plug-in 15095A or 15335A
Line Transformer must be plugged into receptacle J1 (see
Figure 6). The input leads are
4 of the INPUT terminal board.
When shipped from the factory, pins 3 and 4 of J1 are
strapped together t o provide
input may be obtained by removing the strap from pins 3
and 4 and then strapping pins 1 and 4 and pins 3 and 6
(see Figure 8).
Output Connections
Output transformer taps provide connections for 4-ohm,
8-ohm and 16-ohm speakers, plus
bution system (see Figure 6). For 25-volt speaker distribu-
tion systems, use the 8.ohrn tap. Connect to the terminal
of desired impedance and terminal 5 (common). Terminal
functions and designations are listed in Table II. I f stray
electrostatic radiation causes interference, strap terminal 5
(common) to terminal 6 (ground).
CAUTION
frayed wire strands short circuit one
Table II. Soeaker Outouts
Terminal
TB2-2 16 ohms (40V) speaker systems
8 ohms (28V) speaker systems. May be used
for 25V speaker distribution systems.
Using 15095A Line Transformer
connected t o terminals 3 and
600-ohm input. A 150-ohm
a
70.7-volt speaker distri-
a
Function