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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
Posted to alt.electronics,alt.home.repair,uk.d-i-y
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What is inside an LED "starter"
On 04/03/2019 00:43, Roger Hayter wrote:
I don't know when the last public DC mains supply was replaced, but I tend to think that AC/DC TVs were actually designed to work on DC mains up to the early 1950s at least. There were DC mains supplies to the late 1970's in areas like London's West End which were used by the theatres for arc lamps. Apparently also used for many lift and escalator motors. University College London used it too, and not just in their (at the time) Bloomsbury Theatre. We had 220VDC mains sockets in the physics labs, which I used for a carbon arc lamp at one point. (The sockets were like 15A round pin sockets, but the earth pin was nearer to the live pins.) By 1983 (and probably a year or two before), the DC mains supply had ceased and it was generated locally on site instead. Of course, DC supply was something specialised at this point, and not provided to standard consumers - only those with a specific requirement. -- Andrew |
#2
Posted to alt.home.repair,uk.d-i-y
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What is inside an LED "starter"
On Thu, 07 Mar 2019 09:32:01 +0000, Andrew Gabriel wrote:
On 04/03/2019 00:43, Roger Hayter wrote: I don't know when the last public DC mains supply was replaced, but I tend to think that AC/DC TVs were actually designed to work on DC mains up to the early 1950s at least. There were DC mains supplies to the late 1970's in areas like London's West End which were used by the theatres for arc lamps. Apparently also used for many lift and escalator motors. University College London used it too, and not just in their (at the time) Bloomsbury Theatre. We had 220VDC mains sockets in the physics labs, which I used for a carbon arc lamp at one point. (The sockets were like 15A round pin sockets, but the earth pin was nearer to the live pins.) By 1983 (and probably a year or two before), the DC mains supply had ceased and it was generated locally on site instead. Of course, DC supply was something specialised at this point, and not provided to standard consumers - only those with a specific requirement. We had DC at home in the late 1950s/early 1960s in our part of Brighton. The town wasn't completely changed over until 1965. I remember my Tri-Ang train set suddenly acquired two small red boxes - transformers! Before that I had a rotary converter to get 12 volts. -- My posts are my copyright and if @diy_forums or Home Owners' Hub wish to copy them they can pay me £1 a message. Use the BIG mirror service in the UK: http://www.mirrorservice.org *lightning surge protection* - a w_tom conductor |
#3
Posted to alt.home.repair,uk.d-i-y
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What is inside an LED "starter"
On 07/03/2019 10:24, Bob Eager wrote:
We had DC at home in the late 1950s/early 1960s in our part of Brighton. The town wasn't completely changed over until 1965. There's still a lot of AC/DC people in Brighton. Bill |
#4
Posted to alt.home.repair,uk.d-i-y
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What is inside an LED "starter"
On 07/03/2019 10:40, Bill Wright wrote:
On 07/03/2019 10:24, Bob Eager wrote: We had DC at home in the late 1950s/early 1960s in our part of Brighton. The town wasn't completely changed over until 1965. There's still a lot of AC/DC people in Brighton. Bill ROTFL |
#5
Posted to alt.home.repair,uk.d-i-y
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What is inside an LED "starter"
On Thu, 07 Mar 2019 10:40:13 +0000, Bill Wright wrote:
On 07/03/2019 10:24, Bob Eager wrote: We had DC at home in the late 1950s/early 1960s in our part of Brighton. The town wasn't completely changed over until 1965. There's still a lot of AC/DC people in Brighton. 'still' (if you accept that) is probably wrong. That only happened in recent years. And it's much more that *parts* of Brighton are heavily LGBTQ. Other parts are very little LGBTQ, probably below the average. -- My posts are my copyright and if @diy_forums or Home Owners' Hub wish to copy them they can pay me £1 a message. Use the BIG mirror service in the UK: http://www.mirrorservice.org *lightning surge protection* - a w_tom conductor |
#6
Posted to uk.d-i-y
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What is inside an LED "starter"
On 7 Mar 2019 12:01:25 GMT, Bob Eager wrote:
On Thu, 07 Mar 2019 10:40:13 +0000, Bill Wright wrote: On 07/03/2019 10:24, Bob Eager wrote: We had DC at home in the late 1950s/early 1960s in our part of Brighton. The town wasn't completely changed over until 1965. There's still a lot of AC/DC people in Brighton. 'still' (if you accept that) is probably wrong. That only happened in recent years. And it's much more that *parts* of Brighton are heavily LGBTQ. Other parts are very little LGBTQ, probably below the average. I'm getting a bit lost with all these sandwiches nowadays. Just got BLT, then along comes another one. -- Peter. The gods will stay away whilst religions hold sway |
#7
Posted to alt.home.repair,uk.d-i-y
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What is inside an LED "starter"
On Thu, 07 Mar 2019 10:40:13 +0000, Bill Wright wrote:
On 07/03/2019 10:24, Bob Eager wrote: We had DC at home in the late 1950s/early 1960s in our part of Brighton. The town wasn't completely changed over until 1965. There's still a lot of AC/DC people in Brighton. That reminds me of the advice I was offered some forty years ago not to bend down to pick up a 50 pence piece off the pavement if you were in New Brighton but to kick it along the pavement until you were outside of the town. -- Johnny B Good |
#8
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What is inside an LED "starter"
Andrew Gabriel posted for all of us...
On 04/03/2019 00:43, Roger Hayter wrote: I don't know when the last public DC mains supply was replaced, but I tend to think that AC/DC TVs were actually designed to work on DC mains up to the early 1950s at least. There were DC mains supplies to the late 1970's in areas like London's West End which were used by the theatres for arc lamps. Apparently also used for many lift and escalator motors. University College London used it too, and not just in their (at the time) Bloomsbury Theatre. We had 220VDC mains sockets in the physics labs, which I used for a carbon arc lamp at one point. (The sockets were like 15A round pin sockets, but the earth pin was nearer to the live pins.) By 1983 (and probably a year or two before), the DC mains supply had ceased and it was generated locally on site instead. Of course, DC supply was something specialised at this point, and not provided to standard consumers - only those with a specific requirement. We do not care. -- Tekkie |
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