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N8102 LED Power Distribution Board Layout
Figures 1 & 2 show front and back views of the N8102. Layout details are
noted by a red circled area and
corresponding number. The corresponding numbers are described below:
Solder points at both ends of the
board for +DC wiring connection. This allows daisy-chaining of multiple boards
(power bus wiring) for layouts & dioramas that have multiple area that will contain lighting.
More information about connecting multiple boards can be found
Ground or ĖDC connections (same as
Large letter A (front of
board), or B (rear of board) for easy reference in documentation.
A-side uses 20ma current sources (4 separate ones), which support 4 LED
solder pad groupings for up to 4 LEDs in series each for a total of up
to 16 LEDs (depending on supply voltage available). B-side is for LEDs
using resistors and can be connected as series groups or individual (parallel)
This is a cathode grounding point (-DC) that can be bridged with a drop of
solder to complete the circuit. If only 1 LED is to be wired in group 1, then
LED1ís cathode should be solder-bridged (to complete the circuit). If there
will be 2 LEDs in series, then solder the grounding bridge for the cathode of
LED2 (and do not solder LED1ís cathode bridge). If 3 are needed,
then bridge the cathode of LED3. LED4ís cathode is grounded by default. If
less than 4 LEDs in the group are used, LED4ís cathode wonít be connect
anyway. Youíll notice that the cathode of LED1 and the anode of LED2 are
connected (also LED2 to LED3, and LED3 to LED4). This allows the user just
make wire hookups from the LEDs to the board without having to connect wire to
wires for series connections.
Shows how an individual LED hookup
is marked. The first number is the group number 1-4 on A-side, 5 & 6 on
B-side). The second part is the LED number of the group (for example
Notes the solder pad for wire
connection to the anode (+) of the first LED of group 1.
Notes the cathode (-) wire hookup
Since LEDs on A-side use a
20ma current source, by default, they will shine at full (20ma) brightness.
Should the user wish for some reason, to reduce the current going through a
particular LED on side-A, a pair of solder pads is provided for
soldering a resistor for brightness adjustment. Note: even though you may have
up to 4 LEDs in a series group, the brightness for each individual LED can be
adjusted differently, if desired. This provides total control.
- On to side-B of the board. In a typical LED connection to a power
source, an LED requires a resistor for current protection. These solder pads
are for installing a resistor and note that one of the pads is connected to
the + DC circuit. Again, 5 notes the anode
(+) LED solder pad. Also note the cathode solder bridge point
8. If for example, LED1 of group 5 were to be
connected as an individual (not series group) LED, its cathode bridge would be
soldered to complete the circuit. Now letís suppose that you wanted LED1 and
LED2 of group 5 to be a series pair. In this case, you would not solder bridge
LED1ís cathode. Instead you would solder bridge point
10 (which will connect LED1ís cathode to LED2ís anode) and
then solder bridge LED2ís cathode. In this case, the resistor selected for
LED1ís anode would be calculated for use with the series pair.
With this flexibility, side-B of the distribution board can be setup
any way the user wants. For example, group 5 could be 6 individual resistored
LEDs, 6 LEDs in series, 3 groups of series pairs, or 3 in series and 2 in
series and 1 individualÖ or any combination needed.
© 2008 Ngineering