Gilderfluke&Co 8 Bit Digital Audio Systems - Manual (Page 68)

AB-50 Connections:
The inputs and outputs on an AB-50 are connected as follows:
1) power supply
2) power supply
3) A input positive
4) A input negative
5) B input positive
6) B input negative
7) Positive audio output
8) Ground
9) Negative audio output
The power supply connections need to be made to a 12 to 18 VAC trans-
former (supplied with the AB-50).
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 AC power supply
used for the AB-50 can be used for this if desired by attaching the inputs
through switches to the power supply screw terminals. To do this:
1) Attach a jumper wire between terminal #1 and terminal #3 (for the
A input) and/or terminal #1 and terminal #5 (for the B input).
2) Attach your switch(es) between terminals #2 and #4 (for the A input)
and terminals #2 and #6 for the B input.
The audio outputs are a + 10 dB balanced line level signal. If one of the
two outputs is left floating, the output from the AB-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.
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