[time-nuts] Temperature stability for Thunderbolt: results

Achim Vollhardt avollhar at physik.uzh.ch
Wed Jan 26 10:55:42 UTC 2011


the fan controller setting can be seen here in near-realtime:


I let it autotune once by 'ka4' and left it like that.. works fine.

For photos, I would have to open the box again.. which would seriously 
disturb the temperature :) I will do internal photos next time, but you 
might guess from the outside photos, what is inside.


I used Warren's simple transistor circuit he provided in an earlier post 
to control the fan from the RS232 pin 4. As I wanted to keep the RS232 
outside interface free from additional cables, I opened the TBolt and 
wired pin 4 with a dedicated wire to the outside world.

73s Achim, DH2VA

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