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Recent content by ssozonoff

  1. ssozonoff

    Reverse engineer inductance

    OK, Thanks for your time and effort. Serge
  2. ssozonoff

    Reverse engineer inductance

    Hi Gunnar, I believe you and definately like the simplicity of the solution (KIS), thats why I am quizzing the heck out of you. I am simply very new to all this and trying to learn as much as possible. So are you using a standard pic input or what? I am definately trying to do my homework...
  3. ssozonoff

    Reverse engineer inductance

    Hmmm, no I guess I am not yet getting it. Are you saying that I could use a simple input pin on the PIC to measure at which point the pulse reaches the threshold voltage? This would not work with a Schmitt Trigger input using 5v since the point at which the pin registers as high would be...
  4. ssozonoff

    Reverse engineer inductance

    Hi, Yes, we did get kicked out in the end during the penality kicks. I must say we did a rather poor job getting the ball in the goal!! Anyway thanks for the info. My last worry is will the A/D on my PIC be quick enough to measure a voltage rise when we are talking about 0.05ms. My...
  5. ssozonoff

    Reverse engineer inductance

    Hi Gunnar, Yeah and we might get kicked out this evening by Ukraine... I drove the circuit with a 5v square wave. I think the probe was on 10x by mistake for this measurement... I have now done some more reading on LR time constants. Basically you are refering to the 1st time constant. You...
  6. ssozonoff

    Reverse engineer inductance

    Gunnar, One more thing that I don't understand when looking at the scope traces I did. I don't see a consistent threshold voltage reached for each of the three cases. The first one is clear an peaks at just under 300mV but the other never reach that which makes things kind of hard to measure...
  7. ssozonoff

    Reverse engineer inductance

    Hi Gunnar, Thanks! Thats an interesting idea I had not thought about. Basically I can simply supply 5v DC to the inductor via the transistor, use an output on the PIC to trigger the switch transistor and then measure the time to reach the threshold which I presume I have measured and dialed in...
  8. ssozonoff

    Reverse engineer inductance

    Hi Guys, I did some testing tonight and I am not really sure what I am seeing on the oscilloscope. This does not look exatcly like what I should be seeing according to the reading I have been doing. I have attached 3 pictures showing the inductor without the rod, with the rod inserted 50% and...
  9. ssozonoff

    Reverse engineer inductance

    Hi Clyde, Agreed and that is the plan of action. The only difference being that to connect to the AD converter of my PIC I need a DC voltage within the range of 0-5v. Thanks for the input, Serge
  10. ssozonoff

    Reverse engineer inductance

    Hi, Surely I need to do some basic calculations first. You mention the correct concept but no detail. I need to figure out the ideal signal to use. In turn I need to produce a signal which is easy to measure, ideally a volateg in the range 0-5v. At the moment I don't have anything but the...
  11. ssozonoff

    Reverse engineer inductance

    Hi Pete, No worries, I have been following as well. Yesterday was France-Switzerland and living in Switzerland I had to watch, but it was a pretty lousy game I thought. With regards to my problem at hand. At the moment I am not trying to build the circuit yet to convert the movement into a...
  12. ssozonoff

    Reverse engineer inductance

    Hi Pete, Thanks, I don't think its and LVDT either!! I was just hoping it was ;-) (would have been more accurate I think) I also could have used a simple chip like the AD698 to get a nice anlog signal for my PIC. sigh.... I do have a sine-wave generator built into my Picoscope but I am not...
  13. ssozonoff

    Reverse engineer inductance

    Hi Guys, I am trying to build a PIC based controller for the trim tabs on my boat. I bought the sensors for the tab position indicators without the electronics and I am trying to figure out how to interface these to a PIC. As seen in the picture the sensor is made up of a steel rod and a...
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