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Kevin Weddle

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Posts posted by Kevin Weddle

  1. I think at 1Khz, the capacitor could not completely charge in one cycle.

    No, that's not it. You have to make the resistance higher than the impedance of the capacitor. 

     

  2. Something I noticed about voltage multipliers. I've never seen two equally charged capacitors reverse bias a diode. But as long as the capacitors are completely charged the diode is reverse biased.

  3. 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.

    post-1191-14279144674694_thumb.jpg

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