Cardano is a joint project of yours truly and Mircea Popescu. The objective: an inexpensive, user-auditable gadget which attempts to deal with the problem discussed in “Don’t Blame the Mice.” Refer to Mr. Popescu’s page for more details.
The device consists of a mainboard (not yet complete) to which two TRNG modules, containing two equivalent analog TRNG circuits (outputs subsequently XOR-ed) each, are connected. (First prototype of this type of TRNG is shown here. It contained one circuit of the kind used in the current version. Statistical analysis of the output for that unit can be seen here.) The design of this and other Cardano components will be documented in excruciating detail and published after the product goes on sale.
Some prototype tidbits! Click on the images to enlarge: