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Recent content by orienteraren

  1. O

    Integrate low voltage signal

    Thanks for helpful answers! After reading your replies and considering a textbook I now think I got the koncept of virtual ground, thank you! Yes, I am trying to create an integrating circuit. The signal that I want to integrate is rather sketchy and noisy, explaining the filtering I want to...
  2. O

    Integrate low voltage signal

    Thanks for the comments. - No there is no switchin the circuit diagram but I do have a manual switch across the capacitor in the real circuit. - In what way does R2 affect the low pass properties? The voltage drop over R1 and then C1 to GND should handle all of the filtering I thoght? - I...
  3. O

    Integrate low voltage signal

    The switch is open, already tried that. After simulating the circuit in LTspice (I added correct values and replacedthe OPamp with another model) I do get the same issue as in real life, zero voltage after the second resistor. I must be doing some logical error that I cannot see. I´m attaching...
  4. O

    Integrate low voltage signal

    Here is the circuit, the signal is output from a sensor that I want to run through a LP filter and then integrate. I do have a resetswitch over the capacitor for reseting it. Here is the circuit:
  5. O

    Integrate low voltage signal

    Hi! I have a low voltage signal (range +/- 50 mV) after I run it through a simple LP filter. I now want to integrate the signal using a larger capacitor but if I connect the signal to the - input on the OP amp I get 0V, both on the input and on the output. I suppose this is a fundamental think...
  6. O

    741 opamp - strange output

    Hi Keith! I wanted to use the opamp as a summer but it didn´t work out the way I expeced so I made a setup with just the 741 to see where the problem was. Even if I provide a negative feedback (invering input to output) via a resistor (10 kohm) I do get the same type of problem, a stable...
  7. O

    741 opamp - strange output

    I must do something really really wrong. I set up a simple 741 CN opamp and feed it with +12V on pin 7, -12 V on pin 4, ground both inputs and measure the voltagge on pin 6 compare to ground and I get -11,4 V! If I leave both inputs (pin 2 and 3) open I get 9,8 V. Shouldn´t I get a 0 out in both...
  8. O

    LT317 voltage ref problem

    Hi! I just got my LT317 voltage regulators. I do need a very precise output on 1.25V so I did the design found in the datasheet ( http://www1.elfa.se/data1/wwwroot/assets/datasheets/07331713.pdf ) under typical applications 1.2-25 v adjustable regulator. I connected everything and feed it eith a...
  9. O

    Voltage integrator circuit

    Thanks for the reply! I tried to simulate it myself and found out just what you wrote. Now I just have to find a reasonable way of implementing it :) Regards Fredrik
  10. O

    Voltage integrator circuit

    Sorry but in what way should the switch across the capacitor "reset" the integration circuit? I was thinking about a switch between gnd and the -input (grounding + and -input) giving the amplifier a zero input on both inputs. Just put zero on the negative input would just keep the output steady...
  11. O

    Voltage integrator circuit

    Hi! If I´m using a voltage integrator circuit of the basic integrator circuit type (OP amp with high resistor on -input, and gnd on + and then a feedbak capacitor between the output and the -input) and then integrate and sample my values. If I then want to "reset" the integrtor circuit to zero...
  12. O

    Find bearing without using magnetosensitive compnents?

    Hi Diemilio! Thanks for the advices. I´ve been looking around ang found the following nice little board: https://www.sparkfun.com/commerce/product_info.php?products_id=9431 This board would give me all the dimensions which would make my measurements very accurate if the would be any (accident)...
  13. O

    Find bearing without using magnetosensitive compnents?

    Hi Diemilio! I thought that I could not use a gyro since the gyro is giving me a rate of angular change in "real time" and I wnat to know the total change in angle between sample one and two and the time between these samples will probably be at least 15 seconds. using a gyro and sampling at the...
  14. O

    Find bearing without using magnetosensitive compnents?

    Hi! Thanks for you ide but I don´t think that an eddy-sensor would work. What I want to do is to take measurements on a vertikal path and I want to know if my measurement tool is rotating (i. e. positioned along another bearing) so I can compensate for this. A compass would be the given soultion...
  15. O

    Find bearing without using magnetosensitive compnents?

    Hi! I´m experiencing a problem. I´m trying to design a circuit where I want to know the bearing. To know the correct angle (i. e. 227 deg) is not of importance but the deviation from the start angle is (i. e. +13 deg) and I cannot use a magnetosensitive component since this application will be...
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