On 18/05/2019 19:57, Bill Wright wrote:
On 18/05/2019 19:48, ARW wrote:


Going to peg it then?

Adam you're being horrible! And what do you mean, a transformer won't
have any voltage on the output unless it has a load?

It does rather depend on how you interpret "transformer".

If you mean the whole charger, then yup its likely with modern li-ion
chargers, there will be no voltage output until a battery is sensed.
Older NiCd and NiMh, may or may not have voltage output at all times
depending on type.

If you mean transformer as in the internal component, then in the case
of an old linear supply - yup it will have AC volts on the output at all
times the primary is powered unless its knackered. I would have though
that linear style supplies in chargers are pretty rare for all but the
most feeble wall wart style chargers these days.

So that leaves a large number of SMPSUs - those will have much smaller
lighter transformers, and again its not uncommon to have then shutdown
their output on no load.


--
Cheers,

John.

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