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  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"...
  16. CBETO3AP

    0-18V Pos/Neg 1A Current Limited

    Hihi because I'm lazy. I just grab the first Internet scheme as an example. I do not know who and why has put diodes. The potentiometer is understood. And of course, LM317, LM337 are more appropriate. It's just as basic example.
  17. CBETO3AP

    0-18V Pos/Neg 1A Current Limited

    If you like to experiment try This "I have come up with what seems a fairly decent power supply using a minimal of parts that are easily obtainable and cheap.  The idea is to have a power supply for working with dual supply op amps." A very basic and stable example. The op-amp burn equal to 1A...
  18. CBETO3AP

    0-18V Pos/Neg 1A Current Limited

    I am glad you are happy with what has been achieved. I did not mean to criticize, simply insignificant change without complicating the circuit can eliminate the fall of 0.62v when consumption is 1A. The audioguru also right, C11 and C12 better be around 0.XXXuF. Without wishing to disturb: Svetozar
  19. CBETO3AP

    0-18V Pos/Neg 1A Current Limited

    Hello liquibyte I propose a small change that would improve the stability under variable load. Svetozar
  20. CBETO3AP

    0-30 VDC Stabilized Power Supply 0.002-3 A

    I can see myself forced to put a resistor 10R, but according to manufacturer seems not. To test the reaction of the discharge transistor of a TES I set I = 0.01A and U = 15V. When connecting a 0.1W LED Light Peak is not noticeable, just lights. I know it's something old test this way, but I...
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