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  1. W

    0-30 Vdc Stabilized Power Supply

    i see... so far i don't see any problem with my 2 x 5A supply using in parallel. previously i did connect a 2 light bulb rated at 12V 50W each to test the supply in parallel configuration and i was able to draw 8+A of current from the 2 supply (4+A each) and run that for a while good thing it...
  2. W

    0-30 Vdc Stabilized Power Supply

    i have my supply connected in parallel and works fine.
  3. W

    0-30V Stabilized Power Supply

    I did follow redwire's schematic and part list in page 1 of this thread. No I did not use any resistor with C7.
  4. W

    0-30V Stabilized Power Supply

    Please check my last post, I replaced the files with screenshots as i'm having problem sharing the eagle files. In the screenshot, I think I have all the labels including from to connections. e.g. from board 1 to board 2, from board 2 to transistors... etc.. Should be easy to follow.. : 8)
  5. W

    0-30V Stabilized Power Supply

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  6. W

    0-30V Stabilized Power Supply

    i used poly film capacitor... you'll find that in the video yellow in color on top of the pcb.
  7. W

    0-30V Stabilized Power Supply

    Actually the problem I have was when I power on my power supply LED lights up. This problem goes a way when you turn P2 1/8 clockwise. After that returning P2 while the power is still on to minimum LED remain off. The problem only occurs upon powering up the power supply. Changing the value of...
  8. W

    0-30V Stabilized Power Supply

    Preview of the PSU that 'I'm working on.. Please visit
  9. W

    0-30V Stabilized Power Supply

    i have the same problem. when i apply power to my power supply LED will light up. moving the current pot 1/8 clockwise will turn off the LED. increasing the value of R17 to 56 ohms fix this problem.
  10. W

    0-30V Stabilized Power Supply

    My R18 is 20K with a 200K trimpot. P2 is 10K R17 is 33 ohms . Just check redwire's schematic  page 1 and values is already been changed to the values that you have specified. RV2 and Rf11 was also changed. I will replace this then and see what happens. Btw 'm using MC34071. Thanks Guru..
  11. W

    0-30V Stabilized Power Supply

    i think i found the reason why LED lights up when power is applied to this power supply. Pin 3 of U3 is less than 5.6mV (1.2mV and 0.6mV) when P2 is at minimum position. Adjusting the P2 to 1/8 turn will give me around 5.6mV. At this position of P2 LED will not light up when power is applied...
  12. W

    0-30V Stabilized Power Supply

    or if I put P2 to >1/8 position before powering on the power supply LED will not light up. It will only light up when I put load into it but it will turn the LED of once I adjust P2 towards max position.
  13. W

    0-30V Stabilized Power Supply

    Thanks Guru. One more question, i have completed already the 5A version. I made 2 actually and put some switches to interconnect the 2 x 5A version in series (to get 60V max) or in parallel (to double the amperage). However, one thing i noticed is that when I turn on the power supply the LED of...
  14. W

    0-30V Stabilized Power Supply

    How do I connect an ammeter to this project?
  15. W

    0-30V Stabilized Power Supply

    red/audio.. thanks.. 
  16. W

    0-30V Stabilized Power Supply

    i'm currently building the 5A version. i have all the components soldered already on the PCB. however just now i noticed that D10 is not in the schematic but it's on the part's list. i have check again the final schematic from red and audio and both has NO D10 but it's on their part's list.
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