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Lamp dimmer pollutes the mains electricity supply
ChumpusRex
2 views
This video shows the severely distorted current waveform taken by a conventional phase-angle control tungsten incandescent lamp dimmer.
Not only does the dimmer add a lagg...
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Medinilla magnifica with supplementary metal halide grow lamp
ChumpusRex
7 views
This is a Medinilla magnifica belonging to a friend. These are notoriously difficult to grow in the UK (and other Northern lattitudes) because they are very demanding of br...
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The Book of Common Prayer (1744)
ChumpusRex
6 views
A friend found this in his attic, presumably passed down by a relative. This is a copy of "The Book of Common Prayer" published in Oxford by the university printers Thomas ...
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Oscar the cute Oriental cat relaxing by the fire
ChumpusRex
60 views
This is Oscar. He's a handsome ginger Oriental cat. He used to wander up and down the road all day, and has taken a liking to the house, and has worked out how to use the c...
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Superflux LED and Luxeon Rebel preview
ChumpusRex
28 views
See the superflux LEDs in action at: http://meltedbutter.users.btopenworld.com/webpics/incar.htm
I found a bulk pack of "superflux" LEDs that I bought about 10 years ago...
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How ATX PSUs work, and how they die. PSU Autopsy
ChumpusRex
33 views
This is an old 525W PC power supply. It's cheap Chinese junk, and the capacitors have blown. It kind of still works, but not well enough to want to keep.
This is a disas...
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Can you add an extra fan to a Netgear GS724T?
ChumpusRex
57 views
Netgear have changed the design of the GS724T v3, and have removed the cooling fan.
Fil689 wants to have a fan, but how do you connect it if the connector has been removed...
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Can you use single-mode fibre (LX) with multi-mode (1000Base-SX) SFP (GBIC)?
ChumpusRex
33 views
Don't have a multi-mode fibre cable long enough, but you have got a single-mode cable? Not got any single-mode (long reach) transceivers?
Well, you might be in luck. You...
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Light-emitting pickled cucumber energised with 240 V.
ChumpusRex
72 views
240 V through a pickled cucumber.
Nice light show, zapping and smoke. What more could a growing boy ask for?
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Domestic 415V 3-phase supply. ABB Meter and Horstmann timeswitch
ChumpusRex
68 views
240/415 V; 100 A supply from a large townhouse in central London.
The building is heated primarily by night-storage heaters, hence the reason for providing a 70 kW supply...
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