The PRIZM Sound Board User's Manual
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Below, an example of a decorative kill key (July 2010)
The Kill Key must be made out of a non-conductive material (PVC, Nylon etc).
Here’s the usual wiring of the recharge port. Please note that not all recharge ports
have the exact same pinout. User must understand the principle of wiring a recharge
port and must be able to identify the different pins of a socket.
The idea is fairly simple: the positive of the battery pack goes to the recharge port
central pin (referred as
tip
) and the to the positive of the board. It’s not affected by
the kill key. The negative of the battery pack goes to the pin of the recharge port that
is connected to the outer
sleeve of the socket
. The last pin, referred as
switched
negative pin
and goes to the negative of the board.
When nothing is inserted in the port, the negative of the battery pack is internally
connected to the switched negative tab, hence powering the board. When a Kill Key is
inserted in the port, the negative of the board is no longer connected to the negative
of the battery pack: the board is fully powered down. When a charger plug is inserted
in the recharge port, the charging voltage is reaching both leads of the battery pack
