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  1. N

    supply voltage

    Having written that, I did wonder whether anyone would take it that way. Yes, but standard, that's not a circuit. I mean it's a standard for the components, but unless the circuit is all the same technology, my guess was the majority of circuits made from such flexible components, were designed...
  2. N

    supply voltage

    Generally the initial list tells you the normal ranges for various things, including the supply range. The "Maximum ratings" or sometimes "Absolute maximum ratings" is explained by thes line at the bottom of the table. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings...
  3. N

    Analog Circuit to Randomly Modulate Amplitude and Frequency

    Just for the record, I think you mentioned the quadrature mixer option. It's more the starting with a sine wave that bothers me. Google "quadrature mixer"?
  4. N

    Analog Circuit to Randomly Modulate Amplitude and Frequency

    Ok, I just googled "ELF" and got 3Hz - 30Hz. Sure, you can slow clocks on digital circuits if that's what's needed. The clock scales the spectrum. Just scale the spectrum nto the range you want. . >>No rectilinear functions in nature. No idea what you mean byu that one, sorry. You get amplitude...
  5. N

    Analog Circuit to Randomly Modulate Amplitude and Frequency

    I quote Alec_t's warning about modulated light. Not software? Sure, ease relates to skillset. This forum has some very broadly capable people. It may be that the easiest way to make the initial noise source, before filtering, is digital, such as a pseudo-random noise generator, even if...
  6. N

    Analog Circuit to Randomly Modulate Amplitude and Frequency

    Thanks for the clarification. It appears that you want to modulate a light source. (incoherent, normal light source) It appears that you want to have that modulation noise-like with mostly low frequency components. I assume that your example of the 20Hz was an example modulation signal. . 20Hz...
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    NAND logic gates - feedback

    Very sorry. I fell into that one. I didn't even spot the significance of the green and the grey. Sorry if I gave you along explanation of what you already knew. Let me have a go at asking what I think is your real question, as in provide a little detail. . Give the circuit provided, the green...
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    Analog Circuit to Randomly Modulate Amplitude and Frequency

    Sinusoidal? Just an observation based on the good advice above. "I have a 20Hz 2Vpp sine wave" Sometimes it is easier to make changes at the source. That is, create what you wanted rather than bend the sine wave you have already. . As also mentioned above, keeping a sine wave (if that has...
  9. N

    NAND logic gates - feedback

    How? In stages, one gate at a time. Give the green traces, names. Treat them as intermediate signals, outputs of one gate and inputs to other gates. Somewhere in your book, or online you have the truth table for a NAND gate. Each NAND gate has two inputs and a single output. If you give the...
  10. N

    How is it that so many wireless signals

    You had an issue?
  11. N

    Angular parallel plates capacitor

    Do you have an image of this? So, just to make sure that I am clear on what you mean: You have two parallal plates, close together, separated by some small distance, forming a capacitor and you want to fold them to 90 degrees out of the plane of the plates so the plates stay the same distance...
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    Wireless audio link

    Many years ago I had briefly a thing called a bonefone. It was a couple of speakers that draped like a scarf across/around your neck and the speakers fell to just in front of your shoulders, where they would couple sound into your chest and head by bone conduction. Not meaing that a scarf is...
  13. N

    How is it that so many wireless signals

    Interference? Yes absolutely, so they are designed that way. We spread them out. Spread out over frequency, time and space. And then when we have to, or for those times when they do interfere, we design them to be interference tollerant. As BobK says, the main way to separate the radio channels...
  14. N

    Looking for some help with designing a circuit

    Depending on what you need that processor to do, something like an attiny will get you arduino programming but a simplified circuit to make the pcb simple.
  15. N

    What is this?

    To add to the other questions: What are they: As above Am radio ferrite rod antennas People can use one to make an AM radio. Usually starter kitset stuff. Experimenter. One is usually enough. :) Use: electronics, fun, experiments, experience. First radio project. Value: Local retail supplier...
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    125kHz RFID Reader and Huge Field Antenna

    This is not really my area, but maybe I can have a try at helping and people more knowledgible can correct. Appologies if I lead you the wrong direction, or just plain guess wrong. . Seems a lot of RFID these days uses passive tags. That is, the tags are powered from the reader while nearby by...
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    125kHz RFID Reader and Huge Field Antenna

    Sorry, a little lost. Why exactly do you want to change the coil diameter to 1.5m? Are you trying to increase range? To increase the area over which it works?
  18. N

    Power calculations aren't this easy are they?

    So to recap. Watts measures a rate of flow of energy. A Watt is a Joule per second. In many electrical things watt-hour is a more convenient measure, as above, as a Joule is not a lot of energy in the power world.. A Watthour is a Joule per second for an hour, or 3600 Joules. . Something heating...
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    Pic interface with sensor

    Not quite sure what you mean by pulsing it, THEN applying power. So, there's an analogue line (0 or 0.65volts) and a power line that you have to interrupt for some reason, then an analogue input back? And you want to design a multiplexor that switches each of these lines? Someone above suggested...
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    Pic interface with sensor

    What sort of sensor? What sort of drive? analogue? Digital? I2C? I2S? That is, what do you want to multiplex?
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