Power supplies was RE: New Classic Finds and etc. (Long)

From: Jim Davis <jimmydevice_at_hotmail.com>
Date: Mon Jan 26 06:38:39 2004

Andy Holt wrote:

>>Wrong...
>>
>>
>
>I think the confusion here is between regulated power supplies (which are
>the only true power supplies as far as many list members are concerned :-)
>and unregulated - typically "plug-top"/"wall wart" items.
>
>For the former what matters is that the voltage is correct, the current
>available is at least that required, and (for some designs) that the load is
>in range for the regulation to work properly.
>
>For the latter, the nominal voltage is general only accurate if the current
>drawn is close to the nominal current. For this sort drawing 500mA from a 2A
>psu may well allow the voltage to rise significantly.
>
>For your phone, however, it is likely something else has gone wrong as
>phones that take a 12v psu typically can use a car battery which can go up
>to 14v (at more current that you want to know about!)
>
>Andy
>
>
>
>
Engineers that design such crap as in the later example should have
their arms and legs broken and thrown
into a cold, fast moving river. Regulators are pennies and what about
over/under line voltage?
Jim Davis. I smell a wampus!
Received on Mon Jan 26 2004 - 06:38:39 GMT