Recent content by kankundachi

  1. kankundachi

    amp problem

    Hi omer_faruk :     As far as you said this problem,it is probability the noise to cause.Especially power circuit is clean output!? If it has 50~60Hz frequency,then it will cause this problem.You can check this point first. :) Best Regards,             Stanley
  2. kankundachi

    0-30 Vdc Stabilized Power Supply

    Hi HelderS :     About your opinion,I can realize your feeling.But I think everyone to bring up his experience in this project is very good.Because it will be make this project to tend to perfect.Besides we can study this project by everyone experience.Isn't it? :) Best Regards,            ...
  3. kankundachi

    0-30 Vdc Stabilized Power Supply

    Hi audioguru :   I have fixed my 0-30 Vdc Stabilized Power Supply. It works very nice. Thank you for your kindly support at this period. Besides I have changed the R18 & R11 to VR100K & VR50K. Because the VR100K can be fine tune the current to 3A , VR50K can be fine tune the voltage to...
  4. kankundachi

    0-30 Vdc Stabilized Power Supply

    Hi audioguru :     Thank you for your kindly reply. I will follow your opinion and try it. ;D Best Regards,                 Stanley
  5. kankundachi

    0-30 Vdc Stabilized Power Supply

    Hi audioguru :   I have found the reason of the minimize current is 670mA. Because R20 original value is 10K,but my circuit is 2.2K. :P After change the R20,the minimize current is 9.1mA,but maximum current is 4.0A.  ??? How about your opinion? And,I will upload my schematic,as below attached...
  6. kankundachi

    0-30 Vdc Stabilized Power Supply

    Dear audioguru :     If D7 isn't working,the vary with voltage (0~30V) will be exceptional. Isn't it? But I still follow your suggesion to check D7 voltage on my board. The result is -5.50V. Besides I found Q2 bias-emitter voltage is 0.61V,Q4 bias-emitter voltage is 0.63V,R15 voltage is...
  7. kankundachi

    0-30 Vdc Stabilized Power Supply

    Sorry ! I forgot to say my circuit adjust voltage is no problem. Only adjust current has problem. Thanks.
  8. kankundachi

    0-30 Vdc Stabilized Power Supply

    Hello dear all:     Today I have finished the power supply circuit. But now I have a problem that's when the circuit is power on and adjust limit current. The limit current adjust range only 670mA ~ 3.92A. The limit current should be 2mA ~ 3A but my circuit is not. When I found the current...
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