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Old 22nd July 2002, 03:26 PM   #1
PedroPO is offline PedroPO  Portugal
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Default son of Zen-lite

After a few unsucessfull tries, I finally found a lamp combination that might work. 4x12v50w halogen lamps.

the resistance of that combination at 24.1 V is 8.033ohm at 3A.

I guess it might work. i'll try it tonight.

My only doubts are the following:

- can I substitute the positive( or negative) rail 8ohm resistors only, or should I change all the 8ohm resistors?

- the value of the resistors in both rails must be the same (symetrical)?
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Old 22nd July 2002, 09:26 PM   #2
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If they look like 8 ohms, you can put them
in anywhere as you like.
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Old 22nd July 2002, 11:56 PM   #3
PedroPO is offline PedroPO  Portugal
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thanks,

if they have 8 ohm i guess its ok, but if they have a litlew more or less?

should I replace all the 8ohm resistors?

or can the positive rail resistors be diferent of the negative ones?
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Old 23rd July 2002, 01:26 AM   #4
Variac is offline Variac  United States
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As Nelson mentions in his Zen lite site, there is some concern that halogen bulb do not last very long run at lower voltages.

As I understand(?) it, tungsten is being continuously blasted off the filiment in any bulb -that is why they fail. In quartz halogen bulbs there is apparently a cycle set up that deposits the metal vapor back onto the filiment instead of the glass.

I suspect that one of the reasons the Q-H bulbs are whiter light is that they can be run hotter without burning away the filiment
The claim is that at lower temps the cycle doesn't work.

I used a 300 watt Q-H bulb pointed against the wall to light my living room for a long time and the bulbs lasted for years, even though they were dimmed often. BUT they were always run up to full brightness often too

I think you will have no problem, the dim filiment probably doesn't spew off as much tungsten.

Please keep us informed how this works out, the amount of power you are running through them, and the brightness- do they glow or are they pretty bright?

I wanna make an Bulbous X Son o Zen
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Old 23rd July 2002, 02:06 AM   #5
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I'm still waiting for some clever young lad or lass to hit upon the idea of using the lights from the amp circuit as illumination for their DIY video projector, thus killing two birds with one stone...

Grey
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Old 23rd July 2002, 08:00 AM   #6
df is offline df  Switzerland
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Default Zen light

I've build a Zen-lite with 3 x 35W/12V per channel and 40 V rails. It works perfectly. I had 2,6 A running and 9Volts per bulb so the hologen cycle works. With six 35W halogens it was to bright for me, so I'm rebuilding it to Var2.

Daniel
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Old 23rd July 2002, 10:09 PM   #7
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The 8 ohm values are not at all critical as long as they
are somewhat matched.

I am informed that Halogens at these low voltages will
mirror the reliability of standard incandescents.
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Old 23rd July 2002, 10:16 PM   #8
PedroPO is offline PedroPO  Portugal
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thanks,

define somewhat: 0,1V? 1V? 10V?

I really don't know...
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Old 23rd July 2002, 10:25 PM   #9
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I mean matched enough that the amplifier does
not show serious DC across the load, which in
my book is 100 mV.
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Old 23rd July 2002, 10:34 PM   #10
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Lightbulb Load dependent

Quote:
Originally posted by Nelson Pass
I mean matched enough that the amplifier does
not show serious DC across the load, which in
my book is 100 mV.
Be careful with HEADphone
they can not take so much current
I have Burned someones
Using them as My StetoScope
I like a doctor, ya 'now

Nice to see you Nelson
I have waited
and I am not the only

i know you soon

gro
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