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  1. V

    0-30 Vdc Stabilized Power Supply

    Thanks audioguru for your quick response. I will try the tips you suggested.
  2. V

    0-30 Vdc Stabilized Power Supply

    Hi again. I've build the modified circuit. Everything seems to work. The voltage goes up to 34.5V and the current to 3.8A. The op-amps U1 and U2 get very hot with no load, especially U1. I measured the voltage at pin7=46V. Also I used two 2n3055 transistors with 0.33R emitter resistors but one...
  3. V

    0-30 Vdc Stabilized Power Supply

    Hi I've got a bridge rectifier module GBPC2502P 25A 200V. Can I use it in this circuit? Also can I make some measurements on the circuit before placing the op-amps 445AP. It was very difficult to get them so I don't want to burn them. I'm looking for expected voltages at different test points...
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    0-30 Vdc Stabilized Power Supply

    Thank you audioguru for your answers. I've decided to use a 12V fan. Would a heatsinks with thermal resistance of roughly 1 C/W be enough? I'm going to use the unregulated voltage from the circuit to drive the fan, but I'm not sure how to bring the voltage down to 12V.
  5. V

    0-30 Vdc Stabilized Power Supply

    Hi to everyone I've decided to build the modified version of 0-30V power supply. I've got 30V 160VA transformer and the op-amps OPA445AP. I have BZX85C5V6 zener diodes at home. Could I use this diode instead of BZX79C5V6?  Also I'm not sure what type of heatsink to use for the output...
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