Hi Rob Watts,
Im sure when I read your interview when designing the chord Hugo you were working late into the night over Christmas,do you have all the gear to work from home when your doing modifications,thought building the circuits need special machines at the factory as in fitting and soldering the parts
The prototypes come to me precision soldered - Chord do a special automated run for the prototypes. If I need to change components, it's no problem, I can solder with a needle tipped soldering iron for the small SMD parts, and regular chip resistors and caps are easy to change.
Actually, with modern SPICE simulation (this means you put the analogue design into a simulator which tells you the performance), and the fact that the base technology (that is say the pulse array DAC) is now very mature, I only needed to change 4 components, and that was down to the wrong parts installed. My calculations said the DAC would be 120 dB dynamic range, and it was exactly that.
The work over Christmas was FPGA coding, adding all the features needed, as the prototypes were tested 9 months earlier, followed by testing.