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  1. K

    1-25 volt power supply

    Yes, maybe the transistors should be in the negative feedback loop of the opamp. But this circuit has to have similar function over much of the operating range. I know the impedance of 200k looks higher than the transistor impedance. But the voltage is relatively the same.
  2. K

    1-25 volt power supply

    No Hero99, that gain of 10 circuit is the same as the original project. Something simple. It is not the sort of circuit that is used.
  3. K

    1-25 volt power supply

    That's true. And you can set the gain at 10, 100, or 10,000 and still have the exact same ouput.
  4. K

    1-25 volt power supply

    Okay nobody likes two opamps. Are you going to put the load here or there. A gain of 100 is better unless it's a power supply for microwaves.
  5. K

    1-25 volt power supply

    Yes, a gain of more than 1 is more desireable as the load current changes by a lot. A gain of 10 is very fine.
  6. K

    1-25 volt power supply

    I know that circuit. The gain must be at least be 1. This circuit has a gain of 6 which has an obsolete voltage divider. Unless you want to get rid of something else.
  7. K

    1-25 volt power supply

    Yes the circuit can be done. The problem is the gain has to be at least one. But not more.
  8. K

    1-25 volt power supply

    This might be an easier to use power supply than the other one.
  9. K

    electromechanical circuits

    An opamp doesn't source any current.
  10. K

    electromechanical circuits

    Oh, wrong project.
  11. K

    28volt power supply

    Pretty.
  12. K

    28volt power supply

    I'm satisfied with the design. It's not perfect.
  13. K

    28volt power supply

    Yes it makes little sense. Because the potentiometers set the output voltage.
  14. K

    28volt power supply

    The 1-25volt power supply design is a better one.
  15. K

    28volt power supply

    I changed the opamp load resistor from 100K to 200K. But of course the voltage regulation is no where near as good as the 30V Stabilized Power Supply.
  16. K

    1-18volt variable power supply

    The 1-25volt power supply is is the latest.
  17. K

    1-18volt variable power supply

    I'm sorry audioguru. Really I had to delete my last posts.
  18. K

    1-25volt variable power supply

    I changed the opamp load resistor from 100K to 200K. But of course the voltage regulation is no where near as good as the 30V Stabilized Power Supply.
  19. K

    0-30V Stabilized Power Supply

    Thank you audioguru. I'm wrong. I forgot where 0volts differential occurs.
  20. K

    0-30V Stabilized Power Supply

    U2 doesn't have any differential voltage at higher output voltages. At zero volts ouput, it has more differential voltage because of the -3volt power supply. I'm not sure how this can affect the voltage regulation.
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