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Recent content by lean

  1. L

    amplifier EKG :driven right leg circuit design

    ekg circuit The body´s displacement current flows not to ground but rather to the op-amp output circuit.This reduces the pickup as far the ECG amplifier is concerned and effectively the patient. What body´s displacement current is that ?????
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    amplifier EKG :driven right leg circuit design

    ecg amplifier circuit Jhon G.Webster, libro: “Médical Instrumentation Applications and Design”,Pág. 256,257, 258. Why this negative feedback drives the common-mode voltage to a low value??
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    amplifier EKG :driven right leg circuit design

    right leg drive Why is it used????
  4. L

    Quiescent Current y Supply Current ???

    I want to know Who is the current used up by the operational amplifier? and the difference among Supply Current y Bias Current Thanks
  5. L

    Quiescent Current y Supply Current ???

    In a operational Amplifier What is Quiescent Current? and Supply Current?
  6. L

    amplifier EKG :driven right leg circuit design

    driven right leg What I get with driven right leg circuit ???
  7. L

    high impedance input in operational amplifiers

    I can hook light bulb to the battery without resistors so I haven´t wastes. why not?
  8. L

    high impedance input in operational amplifiers

    Why is necessary high impedance input and low impedance out in operational amplifiers ??
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    Problem with simulating 4538 in Proteus

    problem with 4538 I want to simulate 4538 with Proteus but I can´t. pin 1=ground pin2 = resistor(200kohmios) to +5 between pin 1 and pin2 a capacitor (1uF) pin3= +5 pin4 = wave square pin5= pin7 pin 6 = out What happen?? Thanks
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    Why amplified signal passes MAX294 filter?

    max294 I am studing an circuit to obtain signal ECG when this signal is amplified It passes for an filter max294 why?
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    What happens if I atack a BJT by decollector ?

    bjt icb0 What happen if I atack a bjt by de collector, and the base is grounded. It is very important to me Thanks
  12. L

    A phenomena when measuring impedance with feedback technique

    Re: feedback techniques In Mosfet: When I meassure the output impedance using the convencional way, Vx/ix= RE +ro(1 + gmRE(1+Ad))= 60Gohmios If I use feedback techniques to calculate the output impedance, I have to calculate zoA, and Zof= zoA(1 + A*f) A=Io/Vi=gmAd/1+gm*RE+RE/ro =2.47...
  13. L

    differencial biopotencial amplifier

    biopotencial I am working with a differencial biopotencial amplifier based on two coupled buffers and a common instrumentation amplifier. Why must be ac-coupled the bipotential amplifiers?? Thanks
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    A phenomena when measuring impedance with feedback technique

    Re: feedback techniques Hello everybody. If transistor is a Mosfet. When I meassure the output impedance using the convencional way, that is, using a voltage source at the output while shortcutting the dependences ones I get 60 GOhmns. If I use feedback techniques to calculate the output...
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    A phenomena when measuring impedance with feedback technique

    feedback techniques Hello everybody. I would like ask you for a curious phenomemnon by measuring the output impedance in a circuit. Take a look to this (www.eurobotics.org/vco/circuito.doc) simple circuit. When I meassure the output impedance using the convencional way, that is, using a...
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