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Old 8th November 2012, 08:21 AM   #2331
Salas is online now Salas  Greece
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That's good current. Your LEDs are probably strong enough. Up to 600mA your now Tx seems OK. Use 80VA 15+15 when decided to go 1A+. No big deal to go BL since you got 6mA GR.
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Old 8th November 2012, 08:28 AM   #2332
atupi is online now atupi  Romania
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Besides resistors do i need to change something else ?
I don't understand your statement "your leds are probably strong enough" but i can say the 5 leds group from one rail are a but brighter that the other but i have on output a difference of 0.1-0.2v wich is very good i think.
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Old 8th November 2012, 08:41 AM   #2333
Salas is online now Salas  Greece
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Your 3 Leds have enough Vf to give a nice 190mA I was thinking. Just the setting resistors for turning the CCS current up, and to evaluate your sinking temperature of course.
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Old 8th November 2012, 08:47 AM   #2334
atupi is online now atupi  Romania
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Got it Thaks for advices ! Strong east european leds
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Old 8th November 2012, 12:57 PM   #2335
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I finally managed to get my hands on a 2x15V @150VA this should be interesting
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Old 8th November 2012, 01:12 PM   #2336
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Don't turn the CCS current up any higher than 2.5A.
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Old 8th November 2012, 01:12 PM   #2337
Salas is online now Salas  Greece
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I suspect bias inferno plans.
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Old 8th November 2012, 01:21 PM   #2338
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Nah not really
I plan initially something around 1A more or less...
Depending on the sound that I get and the inner temp of the chassis, and if I find a way to use the heatsinks internally I might try 2A max.
It s just that I have found that bigger transformers usually sound better. Even if they are way above the consumption of the circuit.
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Old 8th November 2012, 02:25 PM   #2339
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by dimkasta View Post
................... I might try 2A max............... Even if they are way above the consumption of the circuit.
No.
2A for your CCS will be using ~80% of the maximum capability of your transformer.
That is going to make it work pretty hard and pretty warm.
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Old 8th November 2012, 02:37 PM   #2340
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Correction. It's 160VA

Each 15V secondary can give 5,33A

We ll see
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