Gilderfluke&Co 8 Bit Digital Audio Systems - Manual (Page 65)

Eprom Installation:
The MiniRepeaters can hold a single Eprom in any of the following sizes:
27C010
27C020
27C040
27C080
The unused upper address bits are ignored in the smaller sized chips
Eproms from most manufacturers. Some manufacturerÕs chips donÕt do this,
and this is where JP-1 comes into play. If you find that your Eproms arenÕt
working, cut the traces on the bottom of the board between pins 1 and 2,
pins 3 and 4, and pins 5 and 6. With these pins disconnected, the unused
pins on the Eproms are pulled up to 5 volts. For a given type of Eprom, in-
sert the following jumpers:
27C010: none
27C020: 1 to 2
27C040: 1 to 2 and 3 to 4
27C080: 1 to 2 and 3 to 4 and 5 to 6
CC-3250 Connections for DR-50 MiniRepeaters:
The inputs and outputs from the backplane of the CC-3250 are connect-
ed as follows:
Top 1) A input negative
2) A input positive
3) B input negative
4) B input positive
5) Ground
6) Negative audio output
Bottom 7) Positive audio output
The A and B inputs require a powered switch closure. The voltage applied
can be anywhere between 5 and 24 volts AC or DC.
The audio outputs are a + 10 dB balanced line level signal. If one of the
two outputs is left floating, the output from the DR-50 will be excessively
noisy. If you are using an amplifier with a single ended input, you will need
to:
1) attach the shield to the amplifier to the GROUND connection.
2) attach the signal to the amplifier to the POSITIVE AUDIO OUTPUT con-
nector.
3) attach the NEGATIVE AUDIO OUTPUT to the GROUND. A small piece of
wire is needed to do this.
Power is connected to the CC-3250 through a four position screw termi-
nal:
1) +5 volts DC
2) +12 volts DC
3) Ground
4) -12 volts DC
The DR-50 MiniRepeaters can be run from as low as +/- 12 VDC to as
high as +/- 15 VDC. The +5 VDC Supply must be within 5% of 5 volts (toler-
ance is +/- .25 volt) for proper operation.
If you are Connecting Directly to a DR-50, the backplane connections
are as follows:
G ILDERFLUKE & C O . ¥ 205 S. F LOWER ¥ B URBANK , C A 91502-2102 ¥ 818/840-9484 ¥ 800/776-5972 ¥ F AX 818/840-9485
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