>From your control circuitry, of course. Or maybe a battery. Whatever
you can imagine.

If you need true isolation, consider a low power mini smps to power it.

Something of this sort:

https://www.amazon.com/HI-Link-HLK-5M05-Switching-Step-Down-Converter/dp/B0=
77ZRWR5C

https://www.aliexpress.com/item/Hi-Link-ac-dc-power-module-5v-3w-220v-isola=
ted-ac-dc-converter/32360232521.html



Cheers,
Manu


On Fri, Jul 20, 2018 at 5:04 PM, David C Brown <dcb.home@gmail.com> wrote:
> Where would the power for the LED side of the opto-coupler come from?
>
> <https://www.avast.com/sig-email?utm_medium=3Demail&utm_source=3Dlink&utm=
_campaign=3Dsig-email&utm_content=3Dwebmail>
> Virus-free.
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> <https://www.avast.com/sig-email?utm_medium=3Demail&utm_source=3Dlink&utm=
_campaign=3Dsig-email&utm_content=3Dwebmail>
> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
> __________________________________________
> David C Brown
> 43 Bings Road
> Whaley Bridge
> High Peak                           Phone: 01663 733236
> Derbyshire                eMail: dcb.home@gmail.com
> SK23 7ND          web: www.bings-knowle.co.uk/dcb
> <http://www.jb.man.ac.uk/~dcb>
>
>
>
> *Sent from my etch-a-sketch*
>
> On 20 July 2018 at 12:04, Manu Abraham <abraham.manu@gmail.com> wrote:
>
>> A quick suggestion: If you still want to use that module and still want
>> the isolation, connect an optocoupler to the control interface, which wi=
ll
>> give an adequate isolation. Just that you will need to tinker with it.
>>
>> Cheers,
>> Manu
>>
>>
>> On Fri, Jul 20, 2018 at 3:49 PM, David C Brown <dcb.home@gmail.com> wrot=
e:
>> > Thank you all for your advice.  It is clear that this module is not sa=
fe
>> > enough to use in the way I envisaged.   I am now tending towards using
>> > wireless remote control modules.  Twenty feet of air, even humid air,
>> is a
>> > damn fine piece of isolation. :-)
>> >
>> > __________________________________________
>> > David C Brown
>> > 43 Bings Road
>> > Whaley Bridge
>> > High Peak                           Phone: 01663 733236
>> > Derbyshire                eMail: dcb.home@gmail.com
>> > SK23 7ND          web: www.bings-knowle.co.uk/dcb
>> > <http://www.jb.man.ac.uk/~dcb>
>> >
>> >
>> >
>> > *Sent from my etch-a-sketch*
>> >
>> > On 20 July 2018 at 08:30, RussellMc <apptechnz@gmail.com> wrote:
>> >
>> >> That looks good as an example - BUT: any add on solution needs to be
>> >> checked to ensure that it fixes the isolation issue and does not have
>> >> issues of its own.
>> >>
>> >> Russell
>> >>
>> >>
>> >>
>> >> On 20 July 2018 at 11:22, Allen Mulvey <allen@amulvey.com> wrote:
>> >>
>> >> > While looking for something else I came across this:
>> >> > Enclosed Pre-Wired Relay
>> >> > https://www.ebay.com/itm/RIB-Functional-Devices-RIBU2C-Enclo
>> >> > sed-Pre-Wired-Relay-120-277VAC-10A/282946266423?epid=3D2261035
>> >> > 387&hash=3Ditem41e0e96537%3Ag%3AkTIAAOSwqxRa52aB&_sacat=3D0&_nkw
>> >> > =3Denclosed+pre-wired+relay&_from=3DR40&rt=3Dnc&LH_TitleDesc=3D0
>> >> >
>> >> > Use the 555 module to switch this one as Russell suggests.
>> >> >
>> >> > Allen
>> >> >
>> >> --
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