Gilderfluke&Co Quad Piggyback Digital to Analog converter User Manual

GILDERFLUKE & CO. ¥ 205 SOUTH FLOWER ST. ¥ BURBANK, CALIF. 91502-2102 ¥ 818/840-9484 ¥ FAX [phone]

printed: February 27, 1999

Preliminary Instructions

for

Quad Piggyback Digital to Analog (D/A) Converter

The Quad Piggyback D/A converter is a small printed circuit card which can be
attached directly to any playback-only MICRO MACs ÔBrickÕ card. When installed, this card
converts all 4 eight bit channels on a brick to four separate analog outputs. Two of the
four output channels on the Brick cards J6 connector are taken over by the installation of
the Quad Piggyback D/A. Channels zero and one of the brick can still be used as
normally as digital outputs, but will carry the same data as is converted to an analog
signals on the Quad Piggyback D/A card. What would normally be used as channel two
of the Brick is used as a TTL level input for feeding test data into the Quad Piggyback D/A.
The 1/4 J6 which would normally be used as channel threeÕs output from the brick is
converted into a 1/4 J6/A output and carries all four of the analog output channels.

Installation:

1) Remove the fuse ÔF4Õ (the one closest to the edge of the card) from the MICRO MACs

card.

2) Bend down the end of the fuse holder which will come precariously close to the
Quad Piggyback D/A card when it is installed (or insulate this end of the fuse holder with
some double faced tape or similar material).

3) Remove the two ULN2803 chips from the two sockets near the large filter capacitor
(C1).

4) Plug the Quad Piggyback D/A converter into the two 18 pin sockets you removed
the ULN2803Õs from and the long single row header that runs down the center of the
board (JP-3).

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Outputs:

Note that only the second two channels of the J6 output gets changed by the

installation of a Quad Piggyback D/A card:

wire number color wire function

1 brown circuit ground
2 red channel 0 data bit 7
3 orange channel 0 data bit 6
4 yellow channel 0 data bit 5
5 green channel 0 data bit 4
6 blue channel 0 data bit 3
7 violet channel 0 data bit 2
8 gray channel 0 data bit 1
9 white channel 0 data bit 0

10 black +15 VDC unregulated power supply (fused for 1 amp)

11 brown circuit ground
12 red channel 1 data bit 7
13 orange channel 1 data bit 6
14 yellow channel 1 data bit 5
15 green channel 1 data bit 4
16 blue channel 1 data bit 3
17 violet channel 1 data bit 2
18 gray channel 1 data bit 1
19 white channel 1 data bit 0
20 black +15 VDC unregulated power supply (fused for 1 amp)

TTL level test data input:

21 brown circuit ground
22 red TTL LEVEL TEST DATA INPUT bit 7
23 orange TTL LEVEL TEST DATA INPUT bit 6
24 yellow TTL LEVEL TEST DATA INPUT bit 5
25 green TTL LEVEL TEST DATA INPUT bit 4
26 blue TTL LEVEL TEST DATA INPUT bit 3
27 violet TTL LEVEL TEST DATA INPUT bit 2
28 gray TTL LEVEL TEST DATA INPUT bit 1
29 white TTL LEVEL TEST DATA INPUT bit 0
30 black +15 VDC unregulated power supply

J6/A analog output:

31 brown circuit ground
32 red +15 VDC unregulated power supply
33 orange + channel 3 output data
34 yellow - channel 3 output reference
35 green + channel 2 output data
36 blue - channel 2 output reference
37 violet + channel 1 output data
38 gray - channel 1 output reference
39 white + channel 0 output data
40 black - channel 0 output reference

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The first two channels are used and connected (if the data isnÕt being used as a

source for an analog signal) just like any other standard 1/4 J6.

The TTL level test data is fed to the test inputs on the Quad Piggyback D/A card.

Standard 1/4 J6 output data from a programming console, Togglodyte, or other
source must not be fed directly into this input. A TTL BUFFER must be used to convert the

relatively high voltages (15 to 24) found on a standard 1/4 J6 to TTL levels (5 volt). If the
Quad Piggyback D/A cards are being installed in a card cage, the eight data bits for this
channel (wires 22 through 29) should be bussed down the backplane to connect all of
the slots with Quad Piggyback D/AÕs in them. A single TTL BUFFER can then be permanently
connected to this buss to send test data to any Quad Piggyback D/A card in the cage.

Using the test function:

When TTL level data is being sent to the test inputs on a Quad Piggyback D/A, any
analog channel can be told to use this data as a source by simply turning on the
appropriate dipswitch on the Quad Piggyback D/A card. Any number of these can be
switched on at the same time, and all of them will follow the command signals coming
down the TTL level Test Buss.

If the function an analog output is attached to can be damaged by sudden
movements, it is a good idea to write down the normal ÔparkedÕ command position it so
that the test command levels can be matched when you switch in to or out of test mode.

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