Help Quicktake 150 external power?

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3 total messages Started by David. E. Goble Wed, 11 Oct 2000 00:48

#179

Author: David. E. Goble
Date: Wed, 11 Oct 2000 00:48

12 lines
1443 bytes

Hi all;

This might be a dumb question, but do external power supplies that
allow you to select different volts, also drop the amps?

I can get one for volts from 3 to 8 but it says it is 300mA (I assume
this is 3 amps)...

--Regards       David. E. Goble
             goble [AT] kin.net.au
          http://www.kin.net.au/goble
Po Box 648 Kingscote, Kangaroo Island, SA 5223

Re: Help Quicktake 150 external power?

#180

Author: RoBearBellie
Date: Wed, 11 Oct 2000 01:22

6 lines
1297 bytes

David. E. Goble <goble@gtech> wrote:

> I can get one for volts from 3 to 8 but it says it is 300mA (I assume
> this is 3 amps)...

Nope.  300mA is 0.3 amp and way too little for your Quicktake 150.

Re: Help Quicktake 150 external power?

#178

Author: Brains
Date: Thu, 12 Oct 2000 20:22

35 lines
2722 bytes

David. E. Goble <goble@gtech> wrote:

> This might be a dumb question, but do external power supplies that
> allow you to select different volts, also drop the amps?

No, and there's no real need to be concerned about it.

The amperage rating on the power supply indicates its _maximum_ load,
not how much it actually puts out. There's nothing to stop you from
hooking up a device which pulls 300mA of current to a power supply that
can output a maximum of 10 A. The device will suck up its 300 mA and the
power supply will hardly bat an eyelid.

Its the *voltage* rating you have to be concerned about - get that
wrong, and you could damage the device.

Also, the power supply's load limit (in amps) must be higher than the
device's current draw rating (also in amps)

> I can get one for volts from 3 to 8 but it says it is 300mA (I assume
> this is 3 amps)...

No no no, silly :) Didn't you learn metric in school?

The little m stands for milli, which is one thousandth of a unit. 300 mA
is 300 milli-Amps, or a bit under a third of an amp.

Brains

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