Inside the 1902
51
The main circuit board in the CED 1902 Mk IV is designated
the CED 1902-20. It has a different computational core from
the previous version, and uses a Cirrus EP7312 with associated
FPGA and flash ROM. These are SMT (surface-mount
technology) devices. There are passive SMT components
mounted on both sides of the board. The CPU can drive an
ADC / DAC pair in order to implement a digital filter. So far as
the analogue circuitry is concerned, it is the same as the
1902 Mk III.
CED 1902-20 D – the 1902 motherboard
pack
filter
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