Recent content by yasef

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    Operational Amplifier Circuit for Adding AC & DC Signals

    We will use actual device. I am not sure what do you mean about semi outomated demonstration but our signal source for AC and DC is lock in amplifier. At the and I should abtain a graph of C vs V.
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    Operational Amplifier Circuit for Adding AC & DC Signals

    Actually I am not very experienced about these things but I think that varactor is a special case. This is just a diode. C come from diode.
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    Operational Amplifier Circuit for Adding AC & DC Signals

    This is not a varactor experiment. Actully now I had desined a circuit. I added a circuit that adds AC signal with Magnitude of 25 mV a variable DC signal between 0 to 5 using with op amp, and applied to a diode. I will measure the AC current through the diode with a lock in amplifier. I will...
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    Operational Amplifier Circuit for Adding AC & DC Signals

    Thanks for your answers.This is what İ want to do:İ want to design a circuit to measure C-V curve of a reverse biased diode. Due to the specifications İ should use a circuit that adds an AC signal with magnitude of 25mV and a variable DC signal between 0 to 5V, and applies it to a diode. Then İ...
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    Operational Amplifier Circuit for Adding AC & DC Signals

    This is what İ want to do:İ want to design a circuit to measure C-V curve of a reverse biased diode. Due to the specifications İ should use a circuit that adds an AC signal with magnitude of 25mV and a variable DC signal between 0 to 5V, and applies it to a diode. Then İ measure AC current...
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    Operational Amplifier Circuit for Adding AC & DC Signals

    For the diode I will measure the C- V characteristic of the diode. Just thank you for your answer and could you tell me if the output signal of the summing amplifier will consist DC and AC coming together so that I can measure Capacitance and voltage simultaneously.
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    Operational Amplifier Circuit for Adding AC & DC Signals

    How to superimpose AC signal With DC signal with operational amplifier?
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    Operational Amplifier Circuit for Adding AC & DC Signals

    I need a circuit that adds an AC signal with magnitude of 25mV and a variable DC signal between 0 to 5V, and applies it to a diode.
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    Problem on Operational Amplifier

    Operational Amplifier I need a circuit that adds an AC signal with magnitude of 25mV and a variable DC signal between 0 to 5V, and applies it to a diode.
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    Graduate Calculating 2D Dispersion Relation with Different Atom Types

    I have derived 2D dispersion relation which has the same atoms. But I also need to calculate this 2D dispersion relation with two different atoms. One atom is located at the center and the other type of atoms surrounds this atom. But I am not sure how ı should calculate it because only...
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    Graduate Debye's Assumptions For Heat Capacity

    Thanks for help.
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    Graduate Debye's Assumptions For Heat Capacity

    What are the Debye model`s assumptions for heat capacity or density of states? According to the einstein model we assume that N oscillators of the same frequency [ω][/o] and in one dimension. In three dimension N is replaced by 3N, there being three modes per oscillator.