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Re: Re: ((OT)) Electronics (electrical) Problem
On Wed, 30 May 2007 02:02:04 GMT, "Jeff Strickland"
<crwlr@verizon.net> wrote: >My meter told me the bulb was good, but now I am not sure about the meter. >Maybe the meter is okay, but the moron working the buttons leaves a bit to >be desired. In any case, the bulb is dead, and the original power supply is >putting out voltage. Two thing, a 40VA replacement transformer is not going to power a 250 watt bulb. Next, a 250 watt 24 volt bulb is going to read about a dead short on ohm test (much less than 1 ohm) While it will look like about a 1.5 ohm load when hot, resistance decreases when element is cold so do not be surprized if it look like or near a dead short on a 1x scale. BTW, a 24volt 250 watt bulb is a pretty serious bulb and can get pretty warm. ----------------- TheSnoMan.com |
Re: ((OT)) Electronics (electrical) Problem
Jeff Strickland wrote:
> I thought I knew this stuff, but there is a nuance that I'm not getting. > > I have a fiber optic lighting system in my swimming pool. It takes a > 24v/250A light bulb. The bubl does not light, but the filiment is okay. > The power supply (transformer) does not put out any voltage, so I bought > a new one. > > The new transformer is stated to provide 40VA, but the light does not > come on. My guess is that a VA and a "regular" A are different. What's > the difference? > > Just another thought for you. I decided to fix the pool lights at my brother in laws cottage 'way' up north and talked to a pool tech before going. He stated the power transformers were the weak point. This fiber unit used a 12 V 75W 'pot light' and a colored spinning wheel but supposedly could take a 100W. Sure enough, I didn't even need to meter the power supply once I saw the melted solder on the output transistors. A new unit was pricey and I 'really' don't like replacing 'weak points' with 'new' weak points. So I went into the local town to the hardware store, picked up a 120V 50W bulb (the biggest they had, no 75's), went across the street to a Radio Shack and found a couple pigtails that fit the bulb's base because no one had the proper pigtail in town and converted the sucker to a 'line voltage' box. Basically I tossed out the 12 volt crap and just went 120V. It works great and some day when I go back up if I get ambitious I will up the bulb to a 75W or even the 100W the 'fixture' says it can handle. There is a colored wheel to avoid melting. The owners are fine with the lower 50W though so. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) |
Re: ((OT)) Electronics (electrical) Problem
Jeff Strickland wrote:
> I thought I knew this stuff, but there is a nuance that I'm not getting. > > I have a fiber optic lighting system in my swimming pool. It takes a > 24v/250A light bulb. The bubl does not light, but the filiment is okay. > The power supply (transformer) does not put out any voltage, so I bought > a new one. > > The new transformer is stated to provide 40VA, but the light does not > come on. My guess is that a VA and a "regular" A are different. What's > the difference? > > Just another thought for you. I decided to fix the pool lights at my brother in laws cottage 'way' up north and talked to a pool tech before going. He stated the power transformers were the weak point. This fiber unit used a 12 V 75W 'pot light' and a colored spinning wheel but supposedly could take a 100W. Sure enough, I didn't even need to meter the power supply once I saw the melted solder on the output transistors. A new unit was pricey and I 'really' don't like replacing 'weak points' with 'new' weak points. So I went into the local town to the hardware store, picked up a 120V 50W bulb (the biggest they had, no 75's), went across the street to a Radio Shack and found a couple pigtails that fit the bulb's base because no one had the proper pigtail in town and converted the sucker to a 'line voltage' box. Basically I tossed out the 12 volt crap and just went 120V. It works great and some day when I go back up if I get ambitious I will up the bulb to a 75W or even the 100W the 'fixture' says it can handle. There is a colored wheel to avoid melting. The owners are fine with the lower 50W though so. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) |
Re: ((OT)) Electronics (electrical) Problem
Jeff Strickland wrote:
> I thought I knew this stuff, but there is a nuance that I'm not getting. > > I have a fiber optic lighting system in my swimming pool. It takes a > 24v/250A light bulb. The bubl does not light, but the filiment is okay. > The power supply (transformer) does not put out any voltage, so I bought > a new one. > > The new transformer is stated to provide 40VA, but the light does not > come on. My guess is that a VA and a "regular" A are different. What's > the difference? > > Just another thought for you. I decided to fix the pool lights at my brother in laws cottage 'way' up north and talked to a pool tech before going. He stated the power transformers were the weak point. This fiber unit used a 12 V 75W 'pot light' and a colored spinning wheel but supposedly could take a 100W. Sure enough, I didn't even need to meter the power supply once I saw the melted solder on the output transistors. A new unit was pricey and I 'really' don't like replacing 'weak points' with 'new' weak points. So I went into the local town to the hardware store, picked up a 120V 50W bulb (the biggest they had, no 75's), went across the street to a Radio Shack and found a couple pigtails that fit the bulb's base because no one had the proper pigtail in town and converted the sucker to a 'line voltage' box. Basically I tossed out the 12 volt crap and just went 120V. It works great and some day when I go back up if I get ambitious I will up the bulb to a 75W or even the 100W the 'fixture' says it can handle. There is a colored wheel to avoid melting. The owners are fine with the lower 50W though so. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) |
Re: ((OT)) Electronics (electrical) Problem
Jeff Strickland wrote:
> I thought I knew this stuff, but there is a nuance that I'm not getting. > > I have a fiber optic lighting system in my swimming pool. It takes a > 24v/250A light bulb. The bubl does not light, but the filiment is okay. > The power supply (transformer) does not put out any voltage, so I bought > a new one. > > The new transformer is stated to provide 40VA, but the light does not > come on. My guess is that a VA and a "regular" A are different. What's > the difference? > > Just another thought for you. I decided to fix the pool lights at my brother in laws cottage 'way' up north and talked to a pool tech before going. He stated the power transformers were the weak point. This fiber unit used a 12 V 75W 'pot light' and a colored spinning wheel but supposedly could take a 100W. Sure enough, I didn't even need to meter the power supply once I saw the melted solder on the output transistors. A new unit was pricey and I 'really' don't like replacing 'weak points' with 'new' weak points. So I went into the local town to the hardware store, picked up a 120V 50W bulb (the biggest they had, no 75's), went across the street to a Radio Shack and found a couple pigtails that fit the bulb's base because no one had the proper pigtail in town and converted the sucker to a 'line voltage' box. Basically I tossed out the 12 volt crap and just went 120V. It works great and some day when I go back up if I get ambitious I will up the bulb to a 75W or even the 100W the 'fixture' says it can handle. There is a colored wheel to avoid melting. The owners are fine with the lower 50W though so. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) |
Re: Re: ((OT)) Electronics (electrical) Problem
"SnoMan" <admin@snoman.com> wrote in message news:eqvq53p6e2nnv3jqedqe8jm5brhof2mhan@4ax.com... > On Wed, 30 May 2007 02:02:04 GMT, "Jeff Strickland" > <crwlr@verizon.net> wrote: > >>My meter told me the bulb was good, but now I am not sure about the meter. >>Maybe the meter is okay, but the moron working the buttons leaves a bit to >>be desired. In any case, the bulb is dead, and the original power supply >>is >>putting out voltage. > > > Two thing, a 40VA replacement transformer is not going to power a 250 > watt bulb. Next, a 250 watt 24 volt bulb is going to read about a dead > short on ohm test (much less than 1 ohm) While it will look like about > a 1.5 ohm load when hot, resistance decreases when element is cold so > do not be surprized if it look like or near a dead short on a 1x > scale. BTW, a 24volt 250 watt bulb is a pretty serious bulb and can > get pretty warm. Yeah, I know it's a serious bulb. It gets seriously hot. I have fiber optic lighting in my swimming pool. The light itself lives in a box in a nearby planter, and there is a bundle of fiber cables that go from the pool to this box in the planter. As the fan cools the lamp, there is a color wheel that turns between the end of the fiber cable and the lamp, and the pool changes color as the wheel goes around. I didn't know the math to convert VA to regular A until somebody here told me, and in the example they gave, the result is the same as the "regular A" rating on the spec sheet. The catalog only gave the VA spec, and because I did not know the math, the information given seemed adequate. Adding insult to stupidity, my meter told me that the lamp was very nearly a dead short -- as you said it should be -- and that the transformer I had wasn't putting out anything. Now that I bought a new transformer, I find that the lamp is toast and the old transformer is actually still good. I haven't figured out if the meter lied, or I asked the wrong questions -- it is loaded up with a ---- load of buttons and input taps, and it seems now that I may not have pressed the right buttons and filled the right taps. |
Re: Re: ((OT)) Electronics (electrical) Problem
"SnoMan" <admin@snoman.com> wrote in message news:eqvq53p6e2nnv3jqedqe8jm5brhof2mhan@4ax.com... > On Wed, 30 May 2007 02:02:04 GMT, "Jeff Strickland" > <crwlr@verizon.net> wrote: > >>My meter told me the bulb was good, but now I am not sure about the meter. >>Maybe the meter is okay, but the moron working the buttons leaves a bit to >>be desired. In any case, the bulb is dead, and the original power supply >>is >>putting out voltage. > > > Two thing, a 40VA replacement transformer is not going to power a 250 > watt bulb. Next, a 250 watt 24 volt bulb is going to read about a dead > short on ohm test (much less than 1 ohm) While it will look like about > a 1.5 ohm load when hot, resistance decreases when element is cold so > do not be surprized if it look like or near a dead short on a 1x > scale. BTW, a 24volt 250 watt bulb is a pretty serious bulb and can > get pretty warm. Yeah, I know it's a serious bulb. It gets seriously hot. I have fiber optic lighting in my swimming pool. The light itself lives in a box in a nearby planter, and there is a bundle of fiber cables that go from the pool to this box in the planter. As the fan cools the lamp, there is a color wheel that turns between the end of the fiber cable and the lamp, and the pool changes color as the wheel goes around. I didn't know the math to convert VA to regular A until somebody here told me, and in the example they gave, the result is the same as the "regular A" rating on the spec sheet. The catalog only gave the VA spec, and because I did not know the math, the information given seemed adequate. Adding insult to stupidity, my meter told me that the lamp was very nearly a dead short -- as you said it should be -- and that the transformer I had wasn't putting out anything. Now that I bought a new transformer, I find that the lamp is toast and the old transformer is actually still good. I haven't figured out if the meter lied, or I asked the wrong questions -- it is loaded up with a ---- load of buttons and input taps, and it seems now that I may not have pressed the right buttons and filled the right taps. |
Re: Re: ((OT)) Electronics (electrical) Problem
"SnoMan" <admin@snoman.com> wrote in message news:eqvq53p6e2nnv3jqedqe8jm5brhof2mhan@4ax.com... > On Wed, 30 May 2007 02:02:04 GMT, "Jeff Strickland" > <crwlr@verizon.net> wrote: > >>My meter told me the bulb was good, but now I am not sure about the meter. >>Maybe the meter is okay, but the moron working the buttons leaves a bit to >>be desired. In any case, the bulb is dead, and the original power supply >>is >>putting out voltage. > > > Two thing, a 40VA replacement transformer is not going to power a 250 > watt bulb. Next, a 250 watt 24 volt bulb is going to read about a dead > short on ohm test (much less than 1 ohm) While it will look like about > a 1.5 ohm load when hot, resistance decreases when element is cold so > do not be surprized if it look like or near a dead short on a 1x > scale. BTW, a 24volt 250 watt bulb is a pretty serious bulb and can > get pretty warm. Yeah, I know it's a serious bulb. It gets seriously hot. I have fiber optic lighting in my swimming pool. The light itself lives in a box in a nearby planter, and there is a bundle of fiber cables that go from the pool to this box in the planter. As the fan cools the lamp, there is a color wheel that turns between the end of the fiber cable and the lamp, and the pool changes color as the wheel goes around. I didn't know the math to convert VA to regular A until somebody here told me, and in the example they gave, the result is the same as the "regular A" rating on the spec sheet. The catalog only gave the VA spec, and because I did not know the math, the information given seemed adequate. Adding insult to stupidity, my meter told me that the lamp was very nearly a dead short -- as you said it should be -- and that the transformer I had wasn't putting out anything. Now that I bought a new transformer, I find that the lamp is toast and the old transformer is actually still good. I haven't figured out if the meter lied, or I asked the wrong questions -- it is loaded up with a ---- load of buttons and input taps, and it seems now that I may not have pressed the right buttons and filled the right taps. |
Re: Re: ((OT)) Electronics (electrical) Problem
"SnoMan" <admin@snoman.com> wrote in message news:eqvq53p6e2nnv3jqedqe8jm5brhof2mhan@4ax.com... > On Wed, 30 May 2007 02:02:04 GMT, "Jeff Strickland" > <crwlr@verizon.net> wrote: > >>My meter told me the bulb was good, but now I am not sure about the meter. >>Maybe the meter is okay, but the moron working the buttons leaves a bit to >>be desired. In any case, the bulb is dead, and the original power supply >>is >>putting out voltage. > > > Two thing, a 40VA replacement transformer is not going to power a 250 > watt bulb. Next, a 250 watt 24 volt bulb is going to read about a dead > short on ohm test (much less than 1 ohm) While it will look like about > a 1.5 ohm load when hot, resistance decreases when element is cold so > do not be surprized if it look like or near a dead short on a 1x > scale. BTW, a 24volt 250 watt bulb is a pretty serious bulb and can > get pretty warm. Yeah, I know it's a serious bulb. It gets seriously hot. I have fiber optic lighting in my swimming pool. The light itself lives in a box in a nearby planter, and there is a bundle of fiber cables that go from the pool to this box in the planter. As the fan cools the lamp, there is a color wheel that turns between the end of the fiber cable and the lamp, and the pool changes color as the wheel goes around. I didn't know the math to convert VA to regular A until somebody here told me, and in the example they gave, the result is the same as the "regular A" rating on the spec sheet. The catalog only gave the VA spec, and because I did not know the math, the information given seemed adequate. Adding insult to stupidity, my meter told me that the lamp was very nearly a dead short -- as you said it should be -- and that the transformer I had wasn't putting out anything. Now that I bought a new transformer, I find that the lamp is toast and the old transformer is actually still good. I haven't figured out if the meter lied, or I asked the wrong questions -- it is loaded up with a ---- load of buttons and input taps, and it seems now that I may not have pressed the right buttons and filled the right taps. |
Re: ((OT)) Electronics (electrical) Problem
After all this back-and-forth about the problem, all I can add is that Jeff ought to not throw good money after bad, or incur further risk to himself by calling in a really good electrician (not the guy who can replace a wall switch) and leave it to him. We all think we know a little about electricity, and it's just enough to get a surprise in the form of a lethal or nearly lethal shock. I'd just as soon not read the news and find that Jeff Strickland was found face down with two wires in his hands. ....."let's see now, was that 250 Amps or 250 Watts???" Stick to plumbing repairs. Lots of professional electricians have succumbed to electrical shock, but I've yet to hear of a plumber drowning. |
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