I am in the process of getting my "time box" finished. It has three frequency/time references: a T-bolt, an LPRO-101, and the Chinese NTP/10MHz server. Distribution of 10MHz and 1pps is via a TADD-1 and TADD-3 respectively. I have a Microsemi 58536A distribution amp for GPS. (I do have one other full-time consumer of GPS and one other part-time consumer of GPS.) I would like everything to run from a +12VDC supply to facilitate avoiding power outages. The LPRO-101 is powered by a 12V-to-24V switcher followed by a brute-force LC filter to clean up the PSU noise, so it is effectively happy with anything from 9-16V.
My main +12V supply bus is a 100AH gel-cell that is being float charged at about 13.2V but may be up to +14V during charge and down to +11V during discharge. I want to run everything from this bus. No problem for the Chinese NTP server, the TADD's, or the LPRO-101 with its upconverter. The wild-card in all this is the power for the T-bolt. It needs +5, +12, and -12. I currently am powering it from the mains using a 3-output supply. That doesn't allow for conveniently running from battery power. Obviously the +5 needs to be pretty tightly regulated but not sure about the +12 and -12. Can I cheat and run the +12 from my 12V power bus or does it need to be more tightly regulated? If necessary, I can boost to +15 and then regulate down to +12. I suspect the primary use for +12V is the oven. If the oven controller is analog using something like a FET or BJT as the control element for the heater, supply voltage should be pretty much a non-issue as these devices have a constant current for a given base/gate drive, thus pretty well decoupling the heater current from the supply voltage. Of course I can derive -12V using an isolated switching module. Anyone know the -12V current requirement of the T-bolt off their heads? (Yes, I know, I can take everything apart and stick an ammeter in series with each leg but if someone knows, I can avoid having to do that. Yes, I am being lazy.) Thanks in advance. -- Brian Lloyd 706 Flightline Spring Branch, TX 78070 [email protected] +1.210.802-8FLY (1.210.802-8359) _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
