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Recent content by golfbumb

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    Looking for a book to study z transform

    Re: z transform There are tons of them. Most undergrad digital control systems texts will have a chapter dedicated to them. But start here on an online source at Stanford. This gets to the point of the z-transform mathematics point blank and will lead you in different directions from there...
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    What is a frequency multiplier ?

    Re: frecuency multipliers Oscillators generally work very well at lower frequencies. But at higher frequencies, the oscillators tend to become unstable. A frequency multiplier enables one to keep an oscillator in a stable range and simply multiply the signal to a stable higher frequency for use...
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    Glue for air coil windings?

    Another option is not using glue at all. For small diameter, axial air coils made with sufficiently large wire (22 gauge and larger), use appropriately sized shrink tubing around the coil bundle and slowly heat shrink it into place around the coils. It is fast, not messy, and, after the tubing's...
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    differential cascode votage switch logic

    An excellent paper on the subject can be found at: **broken link removed** (See page 79)
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    [SOLVED] smallest no of transistors

    To "gerryhsu": We are discussing the smallest number of transistors as the original post asks. It does not talk about area, strength of output, delay, or any other criteria. So, unless you demonstrate otherwise, YES, there still is a "rule of thumb." If you can demonstrate the examples I gave...
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    [SOLVED] smallest no of transistors

    Yes, there is a rule of thumb for minimizing the number of CMOS transistors in a design. For every inverter required in your design it takes two transistors. A non-inverting buffer capable of full Vdd to Vss swing takes four. For each nand or nor gate it takes 2*n transistors for every input...
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    Does even harmonic have some special characteristics?

    Odd harmonics superimposed on a fundamental wave create resulting waveforms that are symmetrical about zero, i.e., have no net DC offset. Examples of this are the square wave (which is the sum of all odd harmonics) and the triangle wave. The average AC current over time is therefore zero...
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    Is resistance a function of frequency?

    Qualifying your question: Effective AC resistance in a conductor is a function of frequency. The current density (J) in the conductor decreases exponentially with depth δ, as follows: J=e^(-δ/d) where d is a constant called the skin depth which is where the current at a depth d is 1/e times...
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    What is the chip with NEC 8427xx D7801G 105 markings?

    Re: What is this chip? Reprogram it? No, you can't as it is an ASIC that got all of its characteristics at the time of manufacture. It was not a field programmable device -- other than bios, and through the operating system of course. What you might be able to do is use it as an 8-bit...
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    What is the chip with NEC 8427xx D7801G 105 markings?

    Re: What is this chip? Yes it is a MCU, but it likely runs at around 2MHz. Yes, 2MHz. It is almost exactly 20 years old. It is an NEC D780-1 which is an 8-bit CPU clone compatible with the 2x32 DIP package Zilog Z80 8 bit-CPU. That package was used in the mid 1980s. 8427XX is the...
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    Why called JK flip-flop?

    jk flip flop in hindi Actually, the choice of the letters "JK" in the JK flip flop do have significance. The JK flip flop was named after Jack Kilby, the Texas Instruments engineer that invented the integrated circuit in 1958. The modified RS circuit that eliminated race conditions was named...
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    channel length modulation

    rogger123, with respect to your last post: In the extreme case: Let us leave any gate voltage off for a moment. We have a source depletion region and drain depletion region. If Vds is increased beyond Vds (sat), what we have done is increased the size of the drain depletion region through the...
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    channel length modulation

    Channel length modulation occurs when voltage between drain and source is greater than the voltage between drain and source required to put the device into saturation. This is somewhat simlar to the Early voltage that is a characteristic of bipolar junction transistors. The point at which the...
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    difference between RTOS and normal OS

    google rtos anjoy "A real­time system is one in which the correct operation of the system depends not only on the logical correctness of any computed result, but also on the time at which the result is delivered. A system in which all computed results must be delivered on time is a hard...
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    What does RMS voltage signify?

    Re: what is RMS voltage? The RMS voltage of a signal is computed by squaring the instantaneous voltage, integrating over the desired time, and taking the square root. (Refer to "Hughes" integral formula in his previous post). The RMS computation is ultimately used to give a measure of the...

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