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  1. D

    Speakers and Bass Frequencies

    Re-inforcing Delta Primes comments on its all an illusion, the pursuit of live audio reproduction. To wit his excellent statement fragment "low frequency illusion using psychoacoustic phenomena" Or Harold Youngs statements on continuing evolution of that which, after all, can only be achieved...
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    AI IDE ?

    Sign of the future. Personally I want one that takes my thoughts by telepathy, and outputs a finished design including protos out of a two port box ? Ideas in, stuff out. https://www.flux.ai/jharwinbarrozo/esp32-robot-controller?editor=schematic Regards, Dana.
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    Speakers and Bass Frequencies

    Is there a Bose forum where you can post this question ? Just a thought, and link the dialog back to MakerPro..... Then I see this : Then I see this and wonder if anything is linear there, and one person to the next, for the same source.......its all a vacuum tube versus solid state...
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    what kind of lcd is good？

    Pay particular attention if you want sunlight readability, most poor at that, but there are ones, reflective, transflective, that do a good job. Seeing though is believing. Dont order unless there is supporting comments about readability in direct sun. Or you see one. Go to a trade show to see...
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    AC to ADC design question

    I most certainly did screw up that sim. I was plodding away thinking I want a 1.6 V Vref, thinking Vdd was 3.2, and promptly labeled that source in sim as 1.6, not the correct value for the input to the divider. Or the correct Vdd.... I made the changes to your design and get some odd results ...
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    Not sure where to put this question

    Do you have a picture of prototype, and a schematic ? Datasheets for discrete parts usually have recommendations for power supply bypassing. Not all caps equally effective as bypasses for same capacitance : Use your DSO, one shot, to look at supply rails, to see the actual transient and...
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    AC to ADC design question

    Sim of your new design : Circuit with correct Vref : Regards, Dana.
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    AC to ADC design question

    Some times one cannot see the forest for the trees blocking the view.....:)
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    AC to ADC design question

    No your Vref should wind up much lower because you scale / attenuate the 30 Vac down substantially. https://masteringelectronicsdesign.com/differential-amplifier-calculator-2/ https://www.ti.com/download/kbase/adc/DifGain.htm...
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    AC to ADC design question

    I think you can eliminate 2'ond opamp and do everything in 1 opamp : https://www.ti.com/lit/an/sloa030a/sloa030a.pdf?ts=1690855531938&ref_url=https%253A%252F%252Fwww.google.com%252F Regards, Dana.
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    Opamp Filter circuit

    The easiest way is to use LaPlace transforms, compute T(s) and stimulate it with a step function, and if needed reciprocal transform back to time domain to look at step response. Impedances of elements, like L and C, are used in the transforms...
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    Current Flow

    Typical LED turn on versus color : Regards, Dana.
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    Opamp + capacitor gain circuit

    Not to complicate the discussion but the cap leakage current characteristics will also determine if cap takes on a charge from bias current. Electrolytics, Tants, Ceramic pretty leaky, film caps generally very low leakage. Complicating that Ceramics have a highly non- linear relationship of V...
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    Opamp + capacitor gain circuit

    Its not a "find" per se, but related to input bias current. If you cannot supply the bias current with a DC path the input stage, bipolar, mosfet, jfet, whatever, because its very hi Z, will take leakage current and Hi Z x inputleakage = drive the input to a rail. Not only that, being very hi Z...
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    Question about op amp dual supply circuit...

    I think the C load on output a major issue (this with just 1u each C) : I think an OpAmp that can handle C load good measure to carry out. Dont know if you have seen these ...
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    Opamp + capacitor gain circuit

    You have a floating input (at low freq), so output unpredictable. Dominated by leakage current and pickup and noise..... If you are looking for a non inverting integrator : https://www.electronics-tutorial.net/analog-integrated-circuits/op-amp-integrator/non-inverting-integrator/ Regards...
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    Oscilloscope always showing Sine Wave

    The scope bnc is an input to a attenuator and a amplifier, so yes you can short just the bnc, scope connected to nothing else, but its AC input power, to check noise thru that channel. Note if that scope is relatively new you need to set the vertical input channel to DC so that scope can present...
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    Question about op amp dual supply circuit...

    These are all cautions concerning your design choice. Not answers to your questions as I felt other posters had already taken care of that. Think a yield sign at a busy intersection, you can ignore it and hopefully make it thru, or you can remove the uncertainty and reliably keep on moving...
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    Current Flow

    The graph shows you what the Vbe of a NPN does as is base current turns it on. As you can see it does not change much once it gets > than its intrinisc threshold. So as previously stated by bertus an LED in parallel with that junction simply wont conduct. Regards, Dana.
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    Oscilloscope always showing Sine Wave

    No probe connected, short the bnc center pin (female) to its shell, eg no input signal is result. Channel 1, all other channels off. Do you then still get a sinewave ? Does that scope allow, with a setting, to intertnally route the internal Wavegen directly to a channel ? That could be the...
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