Data Stream Dissector (DSD) Kit Errata
		     last revised 8/8/94 for v0.7

R4 (indicated on the component layout and schematic) has been omitted
from this revision of the kit.  It is not necessary and has absolutely
no effect on the proper behavior of the power supply.

On the component layout diagram for non-isolated input #2 there should
be a small jumper running north-south immediately left of R3 and right
of the coaxial input cable.  The holes are shown but the jumper is
not.  The circuit is shown correctly on the schematic, however.  Note
that this brings the total number of non-labeled jumpers up to 18.

The kit includes five feet of RG-174 miniature 75 ohm cable for the
PCB -> coax panel connectors.  Some people have had success using
simple boring hookup wire.  Your mileage may vary.

One important caveat is to make sure that you are careful with all of
the chips, as they are CMOS.  Use a grounded soldering iron and ground
yourself before removing the chips from the foam (and/or use a
grounding strap).

When soldering, heat each pin for the minimum time possible to
minimize possible damage to your chips.  Wait a few seconds before
resuming with the next pin.  If you are really concerned about
overheating your chips when soldering, buy sockets for some chips
(just the expensive ones) or all of them.

Socketing the PAL is a good idea as it allows for easy use of the
troubleshooting tips if your kit doesn't work on the first try.

Adding a heatsink to Q2 (TIP32) is a VERY good idea if you are using
an external source of anything higher than 6V.  It is absolutely
essential for sources above 9V.  For the ultimate in safety, you may
wish to consider either a) attaching the heatsink to the chassis or b)
mounting the heatsink and transistor on the outside of the chassis.
In either case, you should use a mica washer to insulate the
transistor back from the chassis so there is no electrical connection,
and use heatsink compound to ensure a good thermal connection.

If using the DSD with a 6V battery power supply, consider replacing
the TIP32 power transistor with a D45H11 (same package and pinout).
This will allow the DSD to run at lower input voltages.

Panasonic SV-3700 decks never write start IDs from a digital input
source.  This behavior is not due to the use of the DSD and occurs
even when the DSD is not in circuit.

Providing a small PCB to improve the LED brightness with this revision
of the kit proved to be too costly.  Instructions on how to do this
"correctly" (ledmod.txt) and a schematic diagram (ledmod.ps) are
included in this group of files.  These changes will be incorporated
in the next revision of the main PCB.  Experimenting with lower values
for current-limiting resistors R15 (yellow), R10/R11 (red) may give
better aesthetic results for LED brightness.  Do not use resistor
values below 1k ohm as you may damage the chip(s) driving the LEDs.




	 Data Stream Dissector (DSD) Kit Errata (page 2 of 2)


The kit ships with 5 Pulse transformers.

Building the kit with 4 coaxial inputs or with 4 coaxial inputs is
fine.  In fact, the kits include the proper resistors to do this.

As shipped, a kit with 4 coaxial outputs will only have one
transformer for the coaxial inputs.  It is not recommended to have
more than one non-isolated coaxial input, as this will most likely
lead to ground loop problems when decks are hooked up to multiple
non-isolated coaxial inputs.  With the parts supplied, therefore, a
kit with 4 coaxial outputs should have one isolated coaxial input and
one non-isolated coaxial input.

The inverse is a bit simpler.  4 coaxial inputs (3 isolated, 1
non-isolated) can be provided on a kit with 2 coaxial outputs.  The
caveat is that the optical inputs will not be able to be selected as
the board and PAL only support switching between four inputs.  It is
possible to work around this limitation by providing a switching
mechanism to replace the input select jumpers to the east of U4 on the
component layout diagram.

Summary of input / output limitations:
 maximum total number of coaxial inputs supported on board:   4
 maximum total number of coaxial outputs supported on board:  4
 maximum total number of optical inputs supported on board:   2
 maximum total number of optical outputs supported on board:  2
 board / PAL supports switching between a maximum of four inputs
 each coaxial output / isolated coaxial input needs a transformer
 maximum one non-isolated coaxial input

Note that the DSD Mega Expansion Kit includes additional transformers
and optical parts to build the maximum configuration supported by the
DSD design.  It does not remove any of the limitations listed above.