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Old 16th June 2012, 07:34 PM   #1401
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Can be too much current for BJT?
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Old 16th June 2012, 08:40 PM   #1402
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Its not steady to rely on such a small VR1 margin. Heat up cycle can disrupt it. Better bodge a 4th led to widen that voltage and use a higher value R1. Or stick a blue led in the now gang of 3. Better aim at 0.7A also.
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Old 16th June 2012, 09:11 PM   #1403
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Wich aprox. value for R1 I use tx 9v?
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Old 16th June 2012, 09:28 PM   #1404
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That's a void question if you will not decide the new leds scheme and estimate the voltage margin first. Use the Excel calc.
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Old 16th June 2012, 09:54 PM   #1405
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I forgot, thanks. For 700mA calculate 3R4 I have 3R3 perfect.
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Old 16th June 2012, 10:19 PM   #1406
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2,11V across R1 3R3 639mA max. Vout 4.41
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Old 16th June 2012, 10:21 PM   #1407
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On any load, or different VoMax on dummy?
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Old 16th June 2012, 10:24 PM   #1408
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6R8 dummy load
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Old 16th June 2012, 10:43 PM   #1409
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Vref Red LED again burned!
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Old 16th June 2012, 10:43 PM   #1410
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That one takes you to 0.647A, go lighter load. 10 Ohm for 500mA @ 5V.
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