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Old 23rd January 2012, 09:26 AM   #471
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Exclamation Hi again...

To whoever....

I wonder if this is a good solution: 2 of these in serie - Halogenlampa 24 V 100 W GY6.35, gives app 12 ohm - and take 1 or 2 resistor 40Watt/1 ohm also in serie. That way you can try both lamps and resistor.
And stay at app 14-15 ohm load! And the biulbs are 4000 hours livingtime. And the voltage over the lamps should be fairly ok. And the Heat Sink for resistors will stay somewhat smaller.

I include a pic of the lamp, and if anybody could leave a comment...
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Old 23rd January 2012, 10:52 AM   #472
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with a 50V psu , 2X 24V lightbulb seems a little short , or i miss something ?
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Old 23rd January 2012, 11:02 AM   #473
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Default Yea...

Hi juanitox!

You are right - but with a couple of resistors i serie some of the voltage over the resistor will lower the voltage that stays over the bulbs - but you could also use 3 bulbs= 72 volt/15-16 volt and no resistors.

Could be more than 1 solution on this dilemma ; big heat sink with many resistors - or samller heat sink, w some resistors and 2 or 3 bulbs?

Don`t know for sure still - but some day I will complete this Beast!!

First I must get from Sea to my awaiting B1 Buffer - soon to be finished - if time wills....

Best

Olav
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Old 23rd January 2012, 11:04 AM   #474
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Default wrong

Sorry!

I meant 15-16 ohm with 72 volt approximately!

Olav
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Old 23rd January 2012, 11:32 AM   #475
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dumb question , how do you mesure resistance for a liht bub ?
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Old 23rd January 2012, 11:52 AM   #476
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hi!

Ohm`s law: Volt x Volt / Watt= 24x24 divide on 100= app 5,7 ohm. but it depends somewhat on the current. so app 1,7 Ampere....


Gets you nearby I think

Olav
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Old 23rd January 2012, 12:22 PM   #477
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You really want to measure the bulbs at the voltages and currents you'll be using them. The resistance changes with filament temperature.
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Old 23rd January 2012, 01:44 PM   #478
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Default Thougt so...

Yes - it was my intention to get the powersupply together with 3 bulbs = approximately 15 Ohm - then 2 pieces 1 ohm resistor/50watt --- and then measure the ampere through the serie - and the voltage over each individual bulb/resistor. First measure cold, then measure them when they are hot!

That way I will know the load/heat/and resistance on each bulb(in cold/varm condition).

If they change too much when hot - I will build a resistance-chain like generg.

Thats my plan

Olav
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Old 23rd January 2012, 03:08 PM   #479
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Generg is cookin' something ......... keepin' low profile in last 12 hrs
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Old 23rd January 2012, 06:20 PM   #480
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