Re: [time-nuts] Thunderbolt Power Question
An earlier question concerned whether the Thunderbolt could be put into battery backup mode without the -12V supply. The definitive answer is NO! The Thunderbolt OCXO is controlled via a DAC voltage that can range from -5V to 5V (the standard oscillator control is -5Hz/V. All mine are operating at around 0.35V). The -5V DAC reference depends upon the -12V input supply. Also the Thunderbolt monitors all three supply voltages and it will throw a critical alarm condition when any are out of whack. _ Use video conversation to talk face-to-face with Windows Live Messenger. http://www.windowslive.com/messenger/connect_your_way.html?ocid=TXT_TAGLM_WL_Refresh_messenger_video_072008 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Thunderbolt Power Question
As the requirement is for a few milliamps it appears that All Electgonics has an inexpensive DC DC converter http://www.allelectronics.com/make-a-store/item/DC-32/DC-DC-CONVERTER/-/1.html that runs off of +5v. All I have to do is to run the -19v output throught a negative regualtor and its a done deal. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Thunderbolt Power Question
The ThunderBoltBook2003 pdf manual Section 3.2 Table 3-1 page 3-4 states that the -12V is the "Prime Voltage for the OXCO". This seems to refute the common belief that the -12V is (only) for the RS232 interface. Jim Hall -- From: "michael taylor" <[EMAIL PROTECTED]> Sent: Sunday, July 06, 2008 11:50 AM To: "Discussion of precise time and frequency measurement" Subject: Re: [time-nuts] Thunderbolt Power Question > On Sat, Jul 5, 2008 at 10:44 PM, Tom Clifton <[EMAIL PROTECTED]> wrote: >> As I sit here reviewing the power requirements for the Thunderbolt, I >> note that the -12v is only 10ma. Does this indicate that it is only used >> for the RS232 output and if so for a battery backup I can "cheat" and >> only service the +12v (750ma)and +5v (400ma)? >> > > I'm not sure, but it may be (also?) used for an op-amp as -Vs. > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Thunderbolt Power Question
On Sat, Jul 5, 2008 at 10:44 PM, Tom Clifton <[EMAIL PROTECTED]> wrote: > As I sit here reviewing the power requirements for the Thunderbolt, I note > that the -12v is only 10ma. Does this indicate that it is only used for the > RS232 output and if so for a battery backup I can "cheat" and only service > the +12v (750ma)and +5v (400ma)? > I'm not sure, but it may be (also?) used for an op-amp as -Vs. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Thunderbolt Power Question
As I sit here reviewing the power requirements for the Thunderbolt, I note that the -12v is only 10ma. Does this indicate that it is only used for the RS232 output and if so for a battery backup I can "cheat" and only service the +12v (750ma)and +5v (400ma)? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
