SBOOST User Guide 5
Version 1.4 February 2012 © Copyright 2012SPROG DCC
for the SPROG II. For SBOOST supply voltages in the range 15 –17V you
can use a separate power supply or insert a string of 3 1N4001 (or similar)
diodes in series with the +V connection to drop the voltage slightly.
Connect the SBOOST +V output to the SPROG II +V input.
Connect the SBOOST 0V output to the SPROG II 0 input.
Connection to a SPROG 3
Follow the connection instructions for SPROG II. The SPROG 3 is rated for
the same maximum voltage as the SBOOST and can always use the same
power supply.
If electrical isolation is required between the layout and SPROG 3 then a
separate, isolated, power supply must be used.
Connection to Other Command Stations
TBD
Multiple Power Districts Using SBOOST
If more than one SBOOST is to be connected between the command station
(e.g. one of the SPROG family) and the layout, to give multiple power
districts, then care must be taken with both the DCC input connections and
the track connections to ensure the same polarity at each SBOOST.
Connect all of the SBOOST “In A” terminals together and connect to one
output of the command station.
Connect all of the SBOOST “In B” terminals together and connect to the other
output of the command station.
Connect the “Tr A” and “Tr B” outputs to the layout in a consistent manner in
each power district. E.g. connect “Tr A” to the left rail in each power district
and connect “Tr B” to the right rail in each power district.
BOTH rails MUST be gapped between power districts. The SBOOST track
outputs must only be connected to their own power district, i.e., there must be
NO common wiring between power districts.
If a single power supply is used to power more than one SBOOST it must be
rated to supply the maximum current to all SBOOST simultaneously. E.g. for
two SBOOST the power supply must be rated at greater than 5 Amps.
If separate power supplies are used to power multiple SBOOST then they
should all be of the same type and voltage rating. The 0V connections of all
