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    0-30 Vdc Stabilized Power Supply

    I envy you. But it's not funny. By our standards in the electrical network there shall be 220V +20 % -20 %. You can calculate how much it turns out (176-264 It's normal :o). All of our electronics designed for this.
  2. A

    0-30 Vdc Stabilized Power Supply

    You are right, i forgot about  the voltage losses. In my country mains voltage change from 200 to 240 very often (In rare cases, even is worse (phase is not uniformly loaded)). That's why i want to limit the input voltage. It's a vicious circle. In my country i can't buy op amp that you...
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    0-30 Vdc Stabilized Power Supply

    Can you help me? I want to limit the input voltage. If the line voltage change. So that the output has always been a 20V. Just in this scheme, the output voltage 30VDC (U4+D13=30,2V). I decided if I'm have 20V, then i  need replace the U4 and D13 (18+2,4=20,4V). I was wrong? The output voltage...
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    0-30 Vdc Stabilized Power Supply

    Hi All! What do you think about this version of the scheme? But i have only 19,8VAC transformer. Can i use this scheme having replaced U4 on 7818, D13 on 2,4v zener? Will it work? Is this scheme reliable? (sorry for my english)
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