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

[Robert LaJeunesse]

How about USB to an FT232 that talks SPI to a low-cost DAC or digital pot? Would 
need a stable reference, though. See http://www.sparkfun.com/news/386 and 
http://www.chinwah-engineering.com/USB_SPI_Interface_Software.html for the 
methodology. Could also use a parallel DAC via FT232 bit-banging, see 
www.dlpdesign.com/images/bit-bang-usb.pdf 


________________________________
From: Mark Spencer <mspencer12345 at yahoo.ca>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Fri, December 30, 2011 2:13:41 PM
Subject: Re: [time-nuts] Thunderbolt? (re simple gpsdo.)

On a related note is anyone aware of PC controlled (Ie. RS232 or maybe GPIB ?) 
DAC's that would be suitable for this type of application ?  


I've also contemplated simply using the DAC of a TBolt but it would seem to be 
waste of a Tbolt.  I'm thinking along the lines of something that might acquired 
used on an auction site.