[sdiy] [semi-OT] Droop on power supply output voltage - when is it normal?

Colin Hinz lists at meccanion.com
Sat Dec 20 22:14:08 CET 2014

On Sat, 20 Dec 2014, Justin Owen wrote:

> Hello,
> I marked this as OT because it came out of a conversation about an area of electro-mechanics/magnetics that I'm not at all familiar with.
> Are there any examples where something that is connected to a correctly specced power supply causes the power supply output voltage to drop by 2-3 volts under *normal* operation (where, in this case normal operation is 9-10V)?
> To me that would generally be a symptom of a problem - at least for SDIY stuff - but I was wondering if there were examples out there where a significant voltage drop would be considered part of normal operation?

Sure, if it's an unregulated supply.

The simplest possible power supply (transformer -> bridge rectifier ->
filter capacitors) will droop 10 to 20% from no load to full load,
depending on the transformer.

- Colin

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