"Chris Holmes" wrote| I have purchased a "Kojak light" (orange unfortunately) from CPC ...| Now for the question, this thing contains a low wattage motor and a| 21W inditator bulb, so I presume it's drawing about 2A at 12V. It| could do with being controlled from the opposite end of the church (by| the guy who is also doing the sound effects).| If I made up a suitable cable to feed the 12V down one or the other of| these;| a. Would it work?| b. Would the cable go bang?| c. Would it b*gger up the sound system?a. There would be a lot of voltage drop in the cable, so it might not work.b. Probably notc. Could well cause clicks when you switch on and offYou could either:1. Use a relay with 2A contacts near the power supply and Kojak light,reducing volts drop, and have a low-current feed through the sound multicoreto work the relay coil off a battery.2. Plug the mains PSU into a remote control switch and use a radio keyfob towork that, twenty quid from Maplin, switch 10A mains so would do a lot oflighting/sound/smoke effects.If you wanted a blue light you can get them from Gadget Shop or Maplin, butthey use a mains pygmy bulb so don't reflect as much.OwainPS are you sure it's 21W bulb, my Kojak light is a 55WOwain

It's got a black box with a 12 mic lines going "one way" and 4 returnsgoing t'other. I doubt if any of the mics or returns would be in useon the day.You recon the volts should get there ok Dave? (we're talking approx40 feet in old money)

Re: How to build a Tardis?

Jul 03, 2003 23 Replies

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Tony 23 years ago

relative

Tony

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Terry 23 years ago

Right on Dave! I hadn't a clue! Dr. Who! Who? Was that anything to do with Rex Harrison (who oddly left the school I attended in Liverpool about the same time I was born) and 'Talking to the animals'? No? I now realize I should have asked one of my 3 (North American born) children, now aged 41 to 24! Now what was that again? "Time and Relative Dimensions in Space ...."? Oh. .......... You mean an outdoor loo? Speaking personally I just pop behind a convenient tree and fertilize something! Back to my painting ........... Thanks anyway. Terry.

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Dave Plowman 23 years ago

Others have explained, but it's been shown on TV in pretty well all countries. It has a cult following in the US where they've held conventions.

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AlexL 23 years ago

Ignoring all the OT posts about Dr. Who....

Given that a multi-core system will deliver 48v "Phantom Power" to microphones that need such a thing (e.g. powered dynamic condenser mcis), then passing 12v though ought to be fine... The only thing I am not sure about is the ampage, and whether this would be a problem.

I would suggest researching a bit on the phantom power bit - which of the 3 wires in the XLR takes the feed, and what the usual ampage is.

phantom power is usually pretty low - up to 60mA. 2A sounds rather high :) Take a look at

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idea on using the multi-core to flick a relay is a good one. Maybe the coax one is OK too, but you'll need to check what the cable can handle.

HTH, AlexL

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