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/ Mount Power Question
Mount Power Question
May 13, 2010 12:06 AM
I currently own a CGEM mount and in the next 6 months or so might upgrade to a Losmandy G11 with Gemini.
The CGEM is pretty happy with my 12V, 3A power supply, but I have read many reports that this is an "iffy" range for the G11 and that it is happier at ~18V.
My question is this (please keep in mind I don't know much about EE stuff... even basic stuff):
I currently own a 0-18V, 0-3 Amp AC to DC power supply that I would like to use for mount power if possible. The part that confuses me is that it clearly states that it has constant voltage -OR- constant current and has a dial to control each. Is this type of power supply adequate for powering a DC mount or am I getting myself into trouble heading down that path? Losmandy states that the G11 requires 1.5A.
If interested, I have this model:
Thanks for any advice.
Regards, Ken Try
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APM/TMB-130/780 Takahashi NJP Temma 2 QSI 683WS(G)-8
May 13, 2010 12:55 AM
(putting on my electro-boy beanie)
It will work fine in the sense that it will supply enough current (that's the "amps") at the correct voltage: just set the voltage to 18VDC (or whatever the mount wants) and don't use the constant current mode (or crank the current limit up to maximum). I seriously doubt the mount draws 1.5A all the time--that's probably the maximum when ramping up to a full speed slew.
BUT ... lab equipment like that isn't made to be out in the damp night air--if there's significant dew you will have problems sooner or later. I'd look into using 12 or so NiMH rechargeable batteries for 14.4VDC nominal. You might get away with AA size ($2.50/ea. for Sanyo Eneloop at Amazon plus $30 for a La Crosse Technology BC-700 charger), which would be mighty convenient. If not, D cells with 4-5X more capacity would definitely do the job ($10/ea.).
Better yet, ask Losmandy what they suggest for power.
"We had the sky up there, all speckled with stars, and we used to lay on our backs and look up at them, and discuss about whether they was made or only just happened." --
/ Mount Power Question
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