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Old 17th June 2012, 11:58 AM   #1421
Salas is online now Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
How can increase Vout to 5,25V and current to minimum 800mA or more?
Does the huge capacitor allow the BC550C & Leds underneath to breath? Adding 0.25V its a matter you find the current you run in your Vref now and add a bit of resistance value to reach it. 2R7 R1 or bit less can boost your CCS higher. That's all in the calc, practice it.
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Old 17th June 2012, 12:57 PM   #1422
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With 2R7 R1 red LED don't lit, I will try with 2R4.

Last edited by merlin el mago; 17th June 2012 at 12:59 PM.
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Old 17th June 2012, 01:04 PM   #1423
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Before you change any more.
Do the mark of the schematic. Calculate the currents through every component.
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Old 17th June 2012, 01:07 PM   #1424
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With 2R4 red LED don't lit, current is OK 800mA.
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Old 17th June 2012, 01:08 PM   #1425
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I tested red LED with 9V + 1k resistor IS BURNED, I will replace with a new one.
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Old 17th June 2012, 01:59 PM   #1426
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Why always is the red LED Vref area burned?
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Old 17th June 2012, 02:00 PM   #1427
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Originally Posted by AndrewT View Post
Before you change any more.
Do the mark of the schematic. Calculate the currents through every component.
With burned red LED?
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Old 17th June 2012, 02:25 PM   #1428
Salas is online now Salas  Greece
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Either heat by being obscured under the FT3 in a very hot 0.8A reg, or its local CCS is a short.
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Old 17th June 2012, 02:25 PM   #1429
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Don't measure, calculate.
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Old 17th June 2012, 03:02 PM   #1430
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Quote:
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Either heat by being obscured under the FT3 in a very hot 0.8A reg, or its local CCS is a short.
I get off the FT3 replaced the red LED & burned again. I verified all CCS connections & resistors and are all OK.
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