[time-nuts] Anybody want a Thunderbolt power supply?
holrum at hotmail.com
Wed Aug 31 00:26:24 EDT 2016
The -12V is used to drive the RS-232 signals... it also eventually gets to the EFC dac so it can swing below ground. Also, the +12V gets to the DAC. Pay close attention to generating noise on these lines.
Also, when I did Lady Heather's temperature control PID (with great help from Warren Sarkison) I did some measurements on the effects of temperature on the system with only the tbolt under temperature control and also with both the power supply (the brick supplied with the original TAPR orders) and the tbolt temperature stabilized. It seems about 1/4 to 1/3 of the temperature sensitivity of the system could be attributed to the power supply and the rest came from the oscillator/tbolt. Some attention to the tempco of the power supply would be a good thing.
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