On Thursday, 31 January 2019 11:27:41 UTC, Max Demian wrote:
On 31/01/2019 10:12, The Natural Philosopher wrote:
On 31/01/2019 10:03, wrote:
On Thursday, 31 January 2019 00:57:36 UTC, Rod SpeedÂ* wrote:

... Wallwarts require isolation.

No they do not.

Would you care to explain please?

Wall warts sold in teh UK MUST have isolation between mains and the output.

Either via a 50Hz mains transformer, or via a mains isolation HF ferrite
transformer.

In general to keep to that they do not have overall feedback for voltage
regulation, so that is done by the equipment they are used to supply.

I don't see how a SMPS can work without feedback from the output. Don't
they do it with an LED/light sensor pair?

Yes, smpsu wallwarts are nearly always regulated. Sm lighting 'transformers' not.


NT