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Type: Posts; User: enjunear

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  1. Closed: Re: An elementary question about a battery's Ah or mAh capacity and its implications.

    You need to understand two key points.
    1. Battery capacity is computed when the battery is operating within it's designed operating range.
    This means that you should not run it outside of it's...
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    Closed: Re: Pic Controlled Relay Timer

    I'd go with an RTC, much more stable. Then you don't have to analyze & compensate for the long-term clock error accumulations, which will cause your delay counters to drift away from 6PM... either...
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    Closed: Re: RF pin diode switch design & parts

    You'll need both pieces of information for the design. In terms of power dissipation, heating is a generally thought of as a cumulative, long-term effect, so average power is useful for that part of...
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    Closed: Re: Need Help Line Following Robot

    You can just delete the "J" connectors, unless you plan to use connectors... then they might be ok to keep. Example, keep the two pin J3 connector so you can quickly connect/disconnect the battery...
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    Closed: Re: Harmonics vs Max Frequency

    They are trying to show that transmitting the audio directly with EM waves is not feasible (i.e. driving an antenna directly with 20 Hz -20 kHz signals). Rather, it's easier to build a transmitter &...
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    Closed: Re: how to use c++ as electronic engineer..

    If you get into microcontroller development, a lot of that software/firmware is often written using variants of C/C++ languages, so that would be directly applicable.

    One of the key things I...
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    Closed: Re: problem with regulator

    We need more information about your circuit in order to best help. You should draw a circuit diagram (use Paint, Powerpoint, Visio, any schematic capture tool or simulator...) so we can see all of...
  8. Closed: Re: What is ADS like for Schematic capture and PCB design?

    Following amit's post, ADS is not a good tool for PCB layout. It's much better suited to circuit analysis and complex simulations. It's a design tool, not a general layout application.

    If you...
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    [SOLVED]Closed: Re: Getting Started in Electronics

    It helps to understand the fundamental building blocks in theory, and how they perform in application. This is why college classes teach you the theory, then have you do lab exercises that are...
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    [SOLVED]Closed: Re: Getting Started in Electronics

    Don't forget the hands-on part of electronics. Just like you'd write up a simple function to test out a piece of code, you should also start dabbling with small circuits.

    Get a small-medium...
  11. Closed: Re: How to add a reference network in a circuit in ADS?

    If I understand your intent correctly, simply make two circuits on your schematic. The first circuit will have the LNA all by itself (with a proper signal source and load connected). Circuit two...
  12. Closed: Re: i want to apply rms on smoothed emg signal but facing problem.

    RMS gives you the time-average value of a signal, so it will result in a single number. You can plot the RMS value, but it will simply be a straight line across your plot.

    If you want to smooth...
  13. Closed: Re: i want to apply rms on smoothed emg signal but facing problem.

    RMS is root-mean-square. So you have to square each datapoint, then find the mean (average), then take the square root.

    so the matlab code should look something like this:



    bow_squared =...
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    [SOLVED]Closed: Re: 64 and 256 QAM constellation map

    1) Since you are already using Matlab, use the built-in function, cart2pol.
    MathWorks - CART2POL

    2) Most handheld scientific calculators have a method to convert coordinates from rectangular to...
  15. Closed: Re: flatern/smooth the harmonic to perfect square/digital signal.

    A filter with a cut-off frequency higher than you clock frequency * 10, or so. In order to have a square wave, you need to retain several of the odd harmonics (squarewave is an odd function, thus...
  16. Closed: Re: Noob question regarding Voltage-Mode and Current-Mode PWM Power Supply Controller

    That's the basic theory. The feedback loop will always try to drive the circuit back to a steady-state condition (a target output voltage, in most cases). The current limiter is an additional...
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    Closed: Re: how REALLY a comparator work?

    A comparator is effectively a difference amplifier with infinite (device maximum) gain. When the + and - input vary by a small amount, the output signal swings to a large voltage in an effort to to...
  18. Closed: Re: how to power supply for high speed analog circuit?

    1) Long stretches of wire will look like inductors. A rule of thumb is 20 nH/inch. So 2m would give you ~1.6 uH of inductance. You can use that as a lumped element inductor in your circuit...
  19. Closed: Re: [ HELP ] Basic mathematics ##### Please help #####

    @etmabreu: The OP asked for assistance with the math to solve this problem in another thread. This is a continuation of the subject. background here: link

    @other-side
    Since you are now saying...
  20. Closed: Re: [ HELP ] Basic mathematics ##### Please help #####

    Ok, something is missing. Points a,b,c,d know where they are (know their x,y positions on the map).
    But a,b,c,d don't know how far away the lamp is, relative to themselves?

    Somehow you need to...
  21. Closed: Re: Noob question regarding Voltage-Mode and Current-Mode PWM Power Supply Controller

    "modulating the voltage applied to the converter input"

    In general, for voltage-controlled, the error amplifier looks at a voltage being applied by/to the converter. The error amp runs that...
  22. Closed: Re: [ HELP ] Basic mathematics ##### Please help #####

    A few new questions. First, it appears that the lamp is at a fixed position in space and that you want to find the location directly below it, on the ground?

    1) Are the observation points...
  23. Closed: Re: Could you please help me to find the interpolation

    The location of F is given as the Cartesian coordinate pair (Fx, Fy). All of the points are converted to their X-Y pairs, such that you could plot them on a graph. Recall:


    Using the two...
  24. Closed: Re: Could you please help me to find the interpolation

    You can determine the location of F by using any of the other points using a method called triangulation.

    1) You know the distance from point A to F, so you can draw a circle around A with a known...
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    Closed: Re: about voltage output and capacitor

    Your colleague may have had a bad experience with a larger valued electrolytic cap on the output of a 7805 and is now "gun shy" to recommend it. I'm in line with FvM: refer to the vendor's datasheet...
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