3.0 Fortress Main Board
The main board carries all of the clock electronics except the E1T tubes and their drivers. The E1T
display board and main board are designed to mount back to back with inter-connectors to pass
signals and power between the two boards.
3.1 SAM3X8C Plug In
3.2 Back up power
(A super cap or a Li cell provide back up power; one or the other is fitted).
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Copyright Grahame Marsh/Nick Stock 2019
X2 allows the back up power supply PSU to be disconnected from the SAM3X8C so all of the
registers in the chip can be reset to factory default values.
Summary of Contents for An E1T Timepiece
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Page 120: ...E1T Data Sheet Page 120 Version 1 0 Copyright Grahame Marsh Nick Stock 2019...