On Sat, 30 Dec 2023 01:21:14 +1100, Chris Hogg <me@privacy.net> wrote:

> On Fri, 29 Dec 2023 11:50:47 +0000, Max Demian
> <max_demian@bigfoot.com> wrote:
>
>> On 29/12/2023 09:39, Andy Burns wrote:
>>> John Armstrong wrote:
>>>
>>>> terminates in a plug with external diameter 5.5 mm. I don't know what
>>>> this type of plug is called
>>>
>>> barrel plug, internal diameter varies as well as external.
>>
>> So does the polarity...

> If the existing wall wart is dead, How will the OP will get the
> polarity right if he cannibalises a spare one.

Open the radio or the dead wall wart and work it out that way.

> Will the leads be colour-coded, red and black, +ve & -ve,

A few are but it isnt that common.

> or if not, would it blow his radio if he got it wrong?

Not usually.

On Sat, 30 Dec 2023 01:45:16 +1100, charles <charles@candehope.me.uk>
wrote:

> In article <o0ltoi1bnee4mujmvugdo5v1453801kjig@4ax.com>,
> Chris Hogg <me@privacy.net> wrote:
>> On Fri, 29 Dec 2023 11:50:47 +0000, Max Demian
>> <max_demian@bigfoot.com> wrote:
>
>> >On 29/12/2023 09:39, Andy Burns wrote:
>> >> John Armstrong wrote:
>> >>
>> >>> terminates in a plug with external diameter 5.5 mm. I don't know
>> what
>> >>> this type of plug is called
>> >>
>> >> barrel plug, internal diameter varies as well as external.
>> >
>> >So does the polarity...
>
>> If the existing wall wart is dead, How will the OP will get the
>> polarity right if he cannibalises a spare one. Will the leads be
>> colour-coded, red and black, +ve & -ve, or if not, would it blow his
>> radio if he got it wrong?
>
> It often states on the appliance,

It often states on the wall wart.

On 29/12/2023 09:39, Andy Burns wrote:
> John Armstrong wrote:
>
>> terminates in a plug with external diameter 5.5 mm. I don't know what
>> this type of plug is called
>
> barrel plug, internal diameter varies as well as external.

But no standard that defines which connector is +ve and
which is -ve (assuming DC output).

Some are marked and the manual for the radio might show
the polarity of the connector. Don't assume that they
are all the same.

On Sat, 30 Dec 2023 04:23:42 +1100, cantankerous trolling geezer Rodent
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<FLUSH the abnormal trolling senile cretin's latest trollshit unread>

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On Sat, 30 Dec 2023 04:21:17 +1100, cantankerous trolling geezer Rodent
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On 29/12/2023 09:39, Andy Burns wrote:
> John Armstrong wrote:
>
>> terminates in a plug with external diameter 5.5 mm. I don't know what
>> this type of plug is called
>
> barrel plug, internal diameter varies as well as external.

Thank you!

On 29/12/2023 17:24, Andrew wrote:
> On 29/12/2023 09:39, Andy Burns wrote:
>> John Armstrong wrote:
>>
>>> terminates in a plug with external diameter 5.5 mm. I don't know what
>>> this type of plug is called
>>
>> barrel plug, internal diameter varies as well as external.
>
> But no standard that defines which connector is +ve and
> which is -ve (assuming DC output).
>
> Some are marked and the manual for the radio might show
> the polarity of the connector. Don't assume that they
> are all the same.

Thanks again to all who responded. The wall wart and the appliance are
both marked with power requirement/supply details, and the polarity. In
this case positive is inner. I shall seek out a suitable wall wart on line.

On 30/12/2023 09:23, John Armstrong wrote:
> On 29/12/2023 17:24, Andrew wrote:
>> On 29/12/2023 09:39, Andy Burns wrote:
>>> John Armstrong wrote:
>>>
>>>> terminates in a plug with external diameter 5.5 mm. I don't know
>>>> what this type of plug is called
>>>
>>> barrel plug, internal diameter varies as well as external.
>>
>> But no standard that defines which connector is +ve and
>> which is -ve (assuming DC output).
>>
>> Some are marked and the manual for the radio might show
>> the polarity of the connector. Don't assume that they
>> are all the same.
>
> Thanks again to all who responded. The wall wart and the appliance are
> both marked with power requirement/supply details, and the polarity. In
> this case positive is inner. I shall seek out a suitable wall wart on line.

I'd have offered you one from my vast collection of wall warts built up
since my Commodore Scientific Rechargeable Calculator died in 1981. I
never threw out a working wall wart. I put many into the electronics
recycling skip at my local waste site when I had a huge clean up when my
"office" had new windows fitted. I stopped counting at 100. But don't
feel sad for me, there's still plenty remaining but mostly switching
PSUs now, the transformer based ones had to go!

In message <kva4q9Fo6iaU1@mid.individual.net>, John Armstrong
<jja@blueyonder.co.uk> writes
>On 29/12/2023 09:39, Andy Burns wrote:
>> John Armstrong wrote:
>>
>>> terminates in a plug with external diameter 5.5 mm. I don't know
>>>what this type of plug is called
>> barrel plug, internal diameter varies as well as external.
>
>Thank you!

If the connectors don't match, the obvious thing to do is to chop the
lead off the faulty PSU, and graft it onto the lead of the new one.
--
Ian
Aims and ambitions are neither attainments nor achievements

On 12/29/2023 12:24 PM, Andrew wrote:
> On 29/12/2023 09:39, Andy Burns wrote:
>> John Armstrong wrote:
>>
>>> terminates in a plug with external diameter 5.5 mm. I don't know what this type of plug is called
>>
>> barrel plug, internal diameter varies as well as external.
>
> But no standard that defines which connector is +ve and
> which is -ve (assuming DC output).
>
> Some are marked and the manual for the radio might show
> the polarity of the connector. Don't assume that they
> are all the same.

If there are marking, they might look like this.

https://en.wikipedia.org/wiki/Polarity_symbols

Paul