Recent content by CBETO3AP

  1. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

  2. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    woala :)
  3. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    Hi I work on Hristo PCB, member of this community. http://diyfan.blogspot.com.es/2012/02/adjustable-lab-power-supply.html By changing the shunt, as I feared, the current regulation is very slow, now I'm looking solution without increasing the shunt. No load through the PCB and is cut so.
  4. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    Yes, I have been forced to change the shunt resistor. Now this place metal shunt 10A / 0.1V.Thus I am saving me 1.4V. Plus something like 0.5V to have 10 emiter resistor in parallel. Low Vdrop is because the shunt is bolted directly to the output. And the sensing cable to the out.
  5. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    measured 24V/11A - 0.003V drop, for now
  6. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    BD140 driver emiter current tested - 85mA max at 10A load  8) (200mA expected) The peak voltage of this toroid transformer (filtered, no load) - 38v, i modifed the secondary from 12v/25A to 24V/12.5A 741 opamps is on negative -5.6V (4.7V in my case) supply, ofcorce The LM311 is a comparator...
  7. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    Limited by the 24V / 300W transformer this will give out 24 or 20V-10A. I bought fake China MC34071 and now I'm doing tests with UA741, the truth is that there are going pretty well. I expect a TLE2141AIP and if it is the original'll ask the rest. What I will possibly do after testing is...
  8. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

  9. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    Thank you. At the moment he stays. I have some progress with Proteus.
  10. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    I have a doubt. What is the function of zener D1 (D3) of 10v, why is there?
  11. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    First thanks for the comments. Just I get started to modify the scheme and did not have much time to review and change everything I need. Also I expect your comments. It is the first time I use Proteus. I always try to build recycling scrap, bought mainly old PCB 1 € / 1kg. The TIP35C have them...
  12. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

  13. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    Hi audioguru. Now that I'm done with the other conversation I would like to continue this. To me the truth I do not like to limit the transistor with a resistor if possible. You do not think it is possible to hold without burning? From what I see in the manufacturer PDF, gain low wen collector...
  14. CBETO3AP

    0-18V Pos/Neg 1A Current Limited

    The truth is that I respond with fear, you're very reluctant to my comments and I need not bother you. For me it is obvious that feedback must be in the output of the circuit. I suspected but was not so obvious that the C11, C12 are very large but audioguro corrected me and then I saw that could...
  15. CBETO3AP

    0-18V Pos/Neg 1A Current Limited

    If I'm wrong about something (of course this can be and prefer to see in the community), there is audioguru, who always find the error and tell, and always right, which I respect a lot. This is already on frame of contecst so I would like to haver not said anything about your "work of art"...
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