[time-nuts] Thunderbolt? (re simple gpsdo.)

Jim Lux jimlux at earthlink.net
Fri Dec 30 17:01:00 EST 2011

On 12/30/11 11:39 AM, Robert LaJeunesse wrote:
> How about USB to an FT232 that talks SPI to a low-cost DAC or digital pot? Would
> need a stable reference, though.

There's a bunch of eval boards from LTC, etc. which use this strategy. 
Looks like a serial port to the computer, simple ASCII protocol to set 
DAC values.  We used one for an octal DAC to set I/Q voltages for vector 

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