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Recent content by RobertFalbo

  1. R

    opamp buffer fed input outside common mode range

    It will be OK Differential input voltage ±Supply voltage The common mode voltage is to meet the common mode rejection. your output will be slightly less then the 5V rail. Is this for some kind of current limit on a load connected to the output? Not sure why you would buffer the rail voltage.
  2. R

    Microwave suddenly dims house lights -- but nothing else does as severely

    Is it Aluminum wiring?
  3. R

    Thermocouple Interface Circuit

    Only if you want to compensate for changes in ambient temperature. TC voltage is based on a delta temperature, not absolute temperature.
  4. R

    Microwave suddenly dims house lights -- but nothing else does as severely

    This could be a loose connection on the circuit breaker. After years the connection can become loose and you get some voltage drop with high current loads. Outdoor boxes are prone to this because of hot to cold cycling. One question, Do some lights get brighter ? That would be a open neutral...
  5. R

    Comparator circuit clarification

    Some comparators have build in hysteresis. You can always add your own with a feed back network, to the non inverting input of the comparator.
  6. R

    Press a button to activate an led display timer? Thanks

    Do you want it to still display the time after the button is released?
  7. R

    MCP73831/2: Strange New Issue

    Are you using a water based flux solder. and did it get cleaned? What is the input voltage? Is it on a long wire?
  8. R

    Thermocouple Interface Circuit

    It appears that you have a input offset voltage of about 1.4 mv , with a gain of 100, you get 141 mv when you should get zero (room temperature) And has far as noise in your measurement, getting two sensors to couple together is problematic. Best if they are both submerged in a oil bath (high...
  9. R

    Thermocouple Interface Circuit

    TC voltages are relative to the temperature at the connecting end. Your calibration would drift with temperature of the junction, where you connect the wire to your amplifier. This may be OK if you are trying to measure something very hot and you don't care about a few degrees in error.
  10. R

    Motor Accelerating Under Load

    I think there is something wrong with the bridge , might have it wired wrong or that it is not rated for the voltage.
  11. R

    LR Natural Response circuit

    Thanks, I see where I went wrong, i1(t) is a function and not a variable.
  12. R

    LR Natural Response circuit

    I like your approach, but something seems off. so now we take an integral from t=0 to t=10us (di/dt) 6.7k/8.7k *(24-i1(t) *2k) dt 100*(6.7/8.7) * 24t-1K*i1(t)^2 from t=0 to t=10us I don't see the exponential expression?
  13. R

    LR Natural Response circuit

    yea, I only copied a few digits from the calculator. but used the full precision of the calculator during operations.
  14. R

    LR Natural Response circuit

    I would start by, removing the 8 K, like they say above, add 3 ma (24 volts/8K ohms) back in later. add the 2K and the 4.7K to give you a 6.7K Now look at the voltage divider you have with the 2 K and the 6.7K resistor on 24V V= 24V * 6.7K/(2K+6.7K) = 18.483..V calculate the impedance of...
  15. R

    Thevenise circuit problem

    Hey, I'm just happy that I got the same answer, doing it from two directions. Usually , you make at least one mistake.
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