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  1. N

    DSP selection guide

    People tend to have favourites in terms of which DSP & architecture they like. Which ones are you familiar with? For small projects, we often look for an evaluation board for the technology we want to use. Often just choose ther supplier & browse what they offer. 5 ADCs at 192K samples per...
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    DSP selection guide

    Board? What sort of board? When I needed audio capture, I bought RME equipment. Octamics if you need preamps included. Did you want stand-alone boards? What sort of processing do you need from the DSP?
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    DC motor smart wifi control?

    Which sort of leads back to my question about how it knows when to stop? Somewhat of an issue, remotely. MAybe a wifi camera? :) Mechanical? Limit switch? Maybe if you make the cable fixed & the disc a cunningly-shaped cam, pushing the cable length out, you might be able to have a system that...
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    Ultrasonic sonar

    Wow, can't quite read the date on that diagram. :)
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    DC motor smart wifi control?

    Interesting task & interesting approach. You could go about this several different ways. I'm interested. The "small DC motor", how small? When you switch on the wifi socket, how will you know when it is fully closed, er when to turn it off again? . I guess, I think of either cunning mechanical...
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    Serial to USB back to Serial... can I do it?

    Serial, RS232C?, connectors are cheap. You could likely consider making up your own cable.
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    Looking for help with some projects that require electrical expertise

    What's hybrid power?
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    Looking for an underwater ranging device

    Sorry, not clear on how ranging gets you what you want. If I see the range increase, how do I know whether I am going too fast & getting ahead or too slow & falling behind? Bistatic ranging, sending from one & receiving on the other requires some sort of synch between them to know when the...
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    6V battery charger

    Mr. Google is my constant companion. Give him a try? What is your starting point? If you could give us an idea of your background, maybe someone can pitch an answer just right for you. You mention LEDs. Have any knowledge of current limits or resistors? Are you ok with transformers. If you want...
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    MOSFET Issues

    "ignore"? remove? So you measured this value with a meter? This is a good battery if it does not drop at all under load. The pulse is referenced to the same ground? Seems if everything is right, then there is something else going on. Your hookup wire is ok for 4 amps?
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    What are real example of " While Loop"

    How's arduino go? Setup & loop? setup(); while(1) loop(); end
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    Reprogram MAC address

    Sorry, I might have missed something, but I have to ask. You want to assign a new MAC address. Why? Mostly interest. I know many now let you do this, but how often is that a need. . For how, sounds like some more reading on JTAG will help.
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    Ultrasonic sonar

    Afterthoughts. Another frequency for transducers may be a different oscillation mode, eg transverse instead of axial. The efficiency or directivity of radiation may be quite different. The resonance will get you amplitude, but will lengthen the ringdown depending on the Q factor. The transducer...
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    Ultrasonic sonar

    Apologies if I was covering things you'd already covered well. Difficult to know the level to use. Agreed 50 watts is a good start. Transducers already matched to water, a good start. 50 times oversampling will get you a few dB. The noise accumulation will depend rather obviously on how much...
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    What should I get for beginning electronics?

    . Off-topic, sorry, but, well yes, but not what I'd meant, I thought you'd covered that one, but out of scroll range just now.. I sort of meant that there's always one who will tell you, sincerely, patiently, with your best interests at heart, that it's the Hz, or hurts, that makes the hydrogen...
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    How to connect LED strip to batteries

    Can't quite read the part number on your photo. What's the 3M part number? Look up the voltage you need. Bigger 1.5 volt cells contain more total energy, so will last longer, once you get enough end-on-end to light the strip.. As bluejets says, it's going to be too much for any small battery...
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    Ultrasonic sonar

    I have not read the whole thing, so forgive me if I blunder. Seems the circuit has seen much attention. Not my forte, so I won't go there. Don't know much about your application area, but ... If 40kHz has a period of 25 micro seconds, your 20 micro second pulses are each almost one cycle. The...
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    Capacitor discharge pulse circuit topology, series capacitor?

    Just interested whether anyone knows a compelling reason for the series topology for capacitor discharge pulse circuits as illustrated below. I've just grabbed two circuits from a google search that look vaguely representative. I offer no endorsement of the circuits. The two main topologies I...
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    What should I get for beginning electronics?

    There's some truth in what *Steve* says about rules, but I'd add another. There's a need to tell when the rule being applied is not a rule at all, but myth, misguidance, often well-intentioned, or not applicable. - addition, not replacement Still read his 3 rules.
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    non-contact real-time heart rate monitoring system using Raspberry Pi 3 Model B and Pi NoIR camera

    I've not looked at your references, so I don;t know what size FFT you need nor how fast they must run, Googleing just now lead me to a Raspberry PI benchmark page http://www.roylongbottom.org.uk/Raspberry%20Pi%20Benchmarks.htm#anchor27 which included FFTs. In many cases using an FFT to measure...
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