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Recent content by OddOne

  1. O

    Constant Current Source

    Ah, that's too bad. Thanks for helping me!
  2. O

    Constant Current Source

    I know I can't prevent the voltage drop of 1 volt. Is there a way of perhaps adding an extra circuit at the output of the constant current source to get the 1 volt back?
  3. O

    Constant Current Source

    Thanks for the help then.
  4. O

    Constant Current Source

    You can clearly not deal well with people. I'm just trying to get some ideas that I could try. Sorry, if that upsets you.
  5. O

    Constant Current Source

    What do you mean?
  6. O

    Constant Current Source

    The current doesn't change and the voltage only drops around 1 volt, like expected. So I thought I could try the non-inverting amplifier to get more voltage at the output, but perhaps you have some more ideas I could do some research about.
  7. O

    Constant Current Source

    Yes, I'm using a zenerdiode for the constant reference drop. The problem is exactly like you are describing Bob. I get a voltage change when change the load, but I'm thinking for a way to prevent that or adding another circuit to get the voltage back. I tried to get the same voltage back by...
  8. O

    Constant Current Source

    Thank you for your reply. Is it perhaps possible with a current mirror or changing the voltage with an amplifier?
  9. O

    Constant Current Source

    I've made the simplest BJT Current Source from this link, but I replaced the voltage-divider circuit with a voltage-stabilizing one: http://en.wikibooks.org/wiki/Circuit_Idea/Simplest_Transistor_Current_Source It works, but it does exactly as described under the title "What happens when we...
  10. O

    Trapezoidal Wave Generator Circuit

    After making some adjustments I got it to work. Not yet perfectly, but I'll work on that later. Thank you all for helping me.
  11. O

    Trapezoidal Wave Generator Circuit

    The 9V square wave is generated from a signal generator and this is the maximum voltage it can provide. I only use the second part of the circuit.
  12. O

    Trapezoidal Wave Generator Circuit

    Thanks a lot for explaining! I can remember that I did notice that the frequency has effect on the shape of the waveform. Could you tell me some more about it? What I forget to mention is that I supply the second part of the circuit without the astable multivibrator with 12V, and the square...
  13. O

    Trapezoidal Wave Generator Circuit

    The explanation of KrisBlueNZ really helped me to understand this circuit, but some parts of the circuit I don't fully understand. The circuit works great with an input voltage of 12V, but I want to change the input voltage to 9V. So to test I changed the resistors at the voltage divider of the...
  14. O

    Non-inverting amplifier

    So if I understand it correctly. I need to find a way to get hfe of the transistor to be 10.
  15. O

    Non-inverting amplifier

    I want to amplify a square wave to 12V. The peak voltage is now 10V, but I want to amplify it to 12V. So I was thinking about reducing the peak voltage to 6V and amplify it with a gain of 2.
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