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Old 25th August 2012, 08:13 PM   #1711
merlin el mago is offline merlin el mago
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Have you read the guide?

Is for digital or analog?
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Old 25th August 2012, 08:16 PM   #1712
merlin el mago is offline merlin el mago
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5V Vout Mosfet reg. 2 1.9V LED, 220 Ohm R303. Other parts jumper.

There is in 1st post a calculator to calculate the current, always is better x 2 or x 3, in your case 300 or 450mA
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Old 25th August 2012, 10:18 PM   #1713
wushuliu is offline wushuliu  United States
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I am using bjt. No 220r correct? 2 led rest jumpered. I am getting 2v across 20Ohm dummy no change using trimmer.

Last edited by wushuliu; 25th August 2012 at 10:20 PM.
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Old 26th August 2012, 12:36 AM   #1714
Salas is offline Salas  Greece
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SSLV1.1 builds & fairy tales
You need the 220R or a simple diode in series with the LEDs. You need to jumper the non used positions to close the series Vref circuit. Use a 33R dummy to simulate 150mA load. Set CCS for 200mA minimum. Your now dummy asks for 250mA you are possibly chocking your CCS setting. Find your CCS current by measuring voltage drop across your setting resistor and dividing by its value.
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Old 26th August 2012, 02:28 AM   #1715
wushuliu is offline wushuliu  United States
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Ah, thank you. I was indeed choking the current.Ok so I have BJT, 1k trimmer, 220R and 2Leds. I am getting 300mA w/ 4R 12w and 5.21v out. with trimmer turned all the way. How do I reduce to 5v proper?
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Old 26th August 2012, 03:15 AM   #1716
wushuliu is offline wushuliu  United States
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Never mind. Figured it out. Thanks again Salas.
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Old 26th August 2012, 03:27 AM   #1717
Salas is offline Salas  Greece
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What is it built for?
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Old 26th August 2012, 03:44 AM   #1718
wushuliu is offline wushuliu  United States
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Odac...
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Old 26th August 2012, 12:08 PM   #1719
qusp is offline qusp  Australia
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haha an interesting mix, the designer must think you very foolish when surely USB power is good enough… hehe
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Old 26th August 2012, 12:24 PM   #1720
coolhead is offline coolhead  Malaysia
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Quote:
Originally Posted by wushuliu View Post
Odac...
Sound better or worst or nothing change?
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