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Old 6th December 2005, 07:27 PM   #1
Kaasari is offline Kaasari  Finland
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Default Power led?

Hello!

First, sorry bad english...

I have BrianGT Gainclone premium kit, and that work very good! Sound is beatyful.

I use 18V/200 transform...how i doing "power led" circuit?

I try couple time, but 4-7 day and led broken...

I use 10kohm resistor only...

Please help me, and draw circuit, when i dont cant doing wrong...
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Old 6th December 2005, 07:53 PM   #2
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Connect LED across +ve and -ve DC rails and use 1k ohm 3 watt resistor. This way will make LED fade as rails discharge.

Or connect a diode in opposite way to LED but across it, use 680 ohm 2 watt resistor, and connect across AC winding. This way will make LED go out as soon as power switched off.
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Old 6th December 2005, 07:57 PM   #3
Nordic is offline Nordic  South Africa
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I connected one this weekend for the first time, just soldered a 1.5k resistor to the one leg on the LED, and then soldered the positive side to the positive pole on a cap in the PSU, and the negative one to the 0V point.

1K is enough for the voltage your trannie does... if its a dual rail supply, if I understand, then there will be 2 x 18V between Ve+ and -, thats why I say connect beteen ground rail and either of the supply rails... with single supply this is not a problem I would venture... not that familiar with brian's circuit anymore
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Old 6th December 2005, 08:30 PM   #4
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You can connect between one rail and ground, this would lower the wattage required for your resistor (but it's resistance would need reducing), but this injects the LED current into your ground. Not a big issue, but seeing as how most people are claiming massive things with component changes on one then it seems stupid to do something that would be grossly more worse than changing a resistor brand
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Old 6th December 2005, 09:05 PM   #5
Nordic is offline Nordic  South Africa
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I see, yes I calculated it based on my 33.5V supply lines, I'll take your tip to heart and see if I can get bigger value/higher wattaeg resistors, just a shame they wont fit into the LED holder.
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Old 6th December 2005, 09:06 PM   #6
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you can allways do it like i did...
take some wire and wind it on the transformer 2-3 times..
its the simpliest way (at least for me)
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