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DC pulse from a mains load?

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Bob Engelhardt
Guest

Fri Dec 28, 2018 2:45 pm   



On 12/28/2018 7:10 AM, Terry Pinnell wrote:
Quote:
Thanks, but If I understand you correctly you're suggesting cutting the
current mains cable which goes (directly) to L1 near corner B (so it's a
solution in the 'cut-the-wires' category) and then somehow getting the
DC pulses I need for my L2 toggle circuit ("...manipulate it as you
desire.").

Isn't that effectively a re-statement of my question? It's the
'manipulation' on which I'm seeking advice.

Terry, East Grinstead, UK


No, not cut. I assume that L1 is not hard-wired to the under-carpet
cable. But the cable has a connector that L1 is plugged into. If it is
hard-wired, never mind.

If it is plugged in (as I said previously), unplug it, plug an extension
into the cable, and plug L1 into the extension. Also plug another cord
into the extension and use that cord to control L2. Your original post
asked for the "...simplest safe circuit ..." & that would be a latching
relay.

---cable---<<--extension---<<--- L1
<<--------relay---<<--- L2


Guest

Fri Dec 28, 2018 4:45 pm   



On Friday, 28 December 2018 13:13:11 UTC, jrwal...@gmail.com wrote:
Quote:
On Friday, 28 December 2018 12:40:24 UTC, tabby wrote:

Divide the control end switch into 2 switches, one sends the mains +ve pulses, the other sends the -ve ones. Only when they're both on does it deliver the full mains waveform. CFLs & a large number of LEDs are happy with that.

Some convector heaters use this method for signalling between a timeswitch
and multiple radiators. They use an extra live wire "pilot wire" with
four states:
off, on, +ve half wave rectified and -ve half-wave rectified.

It seems to work well.

John


You can do it without an extra wire. The signal & power wires are the same one. To avoid flicker you need to add a little capacitance at the end. If for some reason you wanted to you could even choose the C to maintain compatibility with a wanted load of filament lamps, though there seems little reason to these days.


NT

Terry Pinnell
Guest

Fri Dec 28, 2018 6:45 pm   



Bob Engelhardt <BobEngelhardt_at_comcast.net> wrote:

Quote:
On 12/28/2018 7:10 AM, Terry Pinnell wrote:
Thanks, but If I understand you correctly you're suggesting cutting the
current mains cable which goes (directly) to L1 near corner B (so it's a
solution in the 'cut-the-wires' category) and then somehow getting the
DC pulses I need for my L2 toggle circuit ("...manipulate it as you
desire.").

Isn't that effectively a re-statement of my question? It's the
'manipulation' on which I'm seeking advice.

Terry, East Grinstead, UK


No, not cut. I assume that L1 is not hard-wired to the under-carpet
cable. But the cable has a connector that L1 is plugged into. If it is
hard-wired, never mind.

If it is plugged in (as I said previously), unplug it, plug an extension
into the cable, and plug L1 into the extension. Also plug another cord
into the extension and use that cord to control L2. Your original post
asked for the "...simplest safe circuit ..." & that would be a latching
relay.

---cable---<<--extension---<<--- L1
--------relay---<<--- L2


Thanks for the follow-up.

The cable is in fact hard-wired to L1, although of course it would be no
major problem to cut it and add an intermediate extension socket at B.
(As mentioned, "There's also a standard mains power socket at B.")

I've never used an AC latching relay but my impression is that they seem
rather expensive and bulky, like this example at about $20 USD.

Terry, East Grinstead, UK

Terry Pinnell
Guest

Mon Dec 31, 2018 9:45 am   



Terry Pinnell <me_at_somewhere.invalid> wrote:

Quote:
Bob Engelhardt <BobEngelhardt_at_comcast.net> wrote:

On 12/28/2018 7:10 AM, Terry Pinnell wrote:
Thanks, but If I understand you correctly you're suggesting cutting the
current mains cable which goes (directly) to L1 near corner B (so it's a
solution in the 'cut-the-wires' category) and then somehow getting the
DC pulses I need for my L2 toggle circuit ("...manipulate it as you
desire.").

Isn't that effectively a re-statement of my question? It's the
'manipulation' on which I'm seeking advice.

Terry, East Grinstead, UK


No, not cut. I assume that L1 is not hard-wired to the under-carpet
cable. But the cable has a connector that L1 is plugged into. If it is
hard-wired, never mind.

If it is plugged in (as I said previously), unplug it, plug an extension
into the cable, and plug L1 into the extension. Also plug another cord
into the extension and use that cord to control L2. Your original post
asked for the "...simplest safe circuit ..." & that would be a latching
relay.

---cable---<<--extension---<<--- L1
--------relay---<<--- L2

Thanks for the follow-up.

The cable is in fact hard-wired to L1, although of course it would be no
major problem to cut it and add an intermediate extension socket at B.
(As mentioned, "There's also a standard mains power socket at B.")

I've never used an AC latching relay but my impression is that they seem
rather expensive and bulky, like this example at about $20 USD.

Terry, East Grinstead, UK


Sorry, forgot to include the link:
https://uk.rs-online.com/web/p/latching-relays/5111098/

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