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  1. Newguy1

    Switching power supply

    Hi Ante Thanks for your reply. Do u mean that I can vary the R6 from 15K to 75K. But how about the current? How about the current limiter? ??? Thanks
  2. Newguy1

    Switching power supply

    Hi Ante Also, I would like to post my construction procedure of the circuit. But I don't know how to add photo to my message. Could u tell me how to make it? Thanks
  3. Newguy1

    Switching power supply

    Hi Ante Good. I am going to build a power supply without transformer. But I still have some problems 1. Like page 53, TL431B is used to control the PWM. Its voltage is 2.5V. What is the variable range of R5 and R6? How to calculate that? Also, how can I...
  4. Newguy1

    Switching power supply

    Hi Ante I mean P29-P54 of the attached pdf file. This file provide some circuit, but I don't know weather they can be adapted to be variable output. I think it is not necessary to variable from 0V to 30V. Instead, it can vary from 3V-25V. Since I know it is hard for a SMPS to...
  5. Newguy1

    Switching power supply

    Hello every body I have studied the 0-30 VDC STABILIZED POWER SUPPLY WITH CURRENT CONTROL CIRCUIT and discussed it with audioguru. I think that is a very good circuit. However, if it can be realized by SMPS (switch mode power supply), it may be much lighter and the project may...
  6. Newguy1

    0-30 Vdc Stabilized Power Supply

    Hi Audioguru Thanks your suggestion. But since the overcharging part is not my responsiable, I have no need to worry about it. And The out put must be controled manually so I can't use IC. So, in order to let user to choice between constant current charging and constant voltage...
  7. Newguy1

    0-30 Vdc Stabilized Power Supply

    Hi audioguru Thanks very much for telling me the limitation of the circuit. Actually, I am a student, I am finding a circuit which can provide a constant current and constant voltage for charging. And both the current and the voltage must be adjustable for different kinds of batteries...
  8. Newguy1

    0-30 Vdc Stabilized Power Supply

    Hi audioguru Thanks for telling me the source. And I would like to ask one think more that can this circuit be used for charger. I think that the current limitter can only limit the current not over one level, but it can not make sure the current is keeped in that level...
  9. Newguy1

    0-30 Vdc Stabilized Power Supply

    I wish I could increase the max. current from 3 AMPs to 5 AMPs e.g. by changing the transformer, diodes and Transisters and PCB tracks width and heat sink etc.
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