[time-nuts] Updated Shera controller

Bruce Griffiths bruce.griffiths at xtra.co.nz
Wed Jul 28 21:16:22 UTC 2010


EWKehren at aol.com wrote:
> One more comment $ 40 would cover every thing including PC board, May go up
>   to 50 depending what D/A you use.  Bert
>
>
> In a message dated 7/28/2010 4:47:46 P.M. Eastern Daylight Time,
> phk at phk.freebsd.dk writes:
>
> In  message<4C5092FA.2030602 at xtra.co.nz>, Bruce Griffiths  writes:
>
>    
>> Instead of copying the Shera controller albeit with higher  resolution
>> its probably more cost effective to choose a microprocessor  with built
>> in time stamping capability.
>>      
> Uhm, isn't this exactly  where you want to use the
> still-smelling-like-brand-new-car PICTIC II with  a good DAC and
> a microcontroller ?
>
>    
Not really its both overkill as it doesnt timestamp, it only measures a 
time interval and underkill in that theres no DAC.
There are also some concerns about the settling time of the TAC buffer 
opamp which isnt strictly necessary for the lower resolution required in 
this application.
PPS timestamping only needs a single TAC.

Bruce





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