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Type: Posts; User: barry

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  1. Closed: Re: Measuring current with ESP32 and Seeed board

    Why a resistor in parallel? That will just change the voltage scaling.
  2. Closed: Re: Measuring current with ESP32 and Seeed board

    Your attachment tells us nothing, other than the physical dimensions of the transformer and that there are a 330 and 470 ohm resistors on the secondary. What's the current transfer ratio?

    If what...
  3. Closed: Re: Measuring current with ESP32 and Seeed board

    It says right there : maximum current, 5 amps. What’s your question?

    If you exceed the PLAINLY STATED manufacturer’s spec, you’re on your own. Maybe it will be ok, maybe it won’t. You don’t even...
  4. Closed: Re: Multiplexing problem in my 8051 clock project.

    I’m not about to analyze 5000 lines of code, but it looks like your problem is that it multiplexes the 4 digits properly and then blanks them for a long period. It might be that you’ve got a routine...
  5. Closed: Re: FYP ideas suggestion on FPGA, or FPGA based network processing/network on chip

    I don’t know what a ‘fyp tittle’ is. Could you explain?
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    [SOLVED]Closed: Re: Diode performance specification

    Which is telling you that if those are critical parameters for you, you shouldn’t be using that particular device. It’s like asking what the 0 to 60 acceleration for a Smart Car is. If you’re asking...
  7. Closed: Re: Operating four Tx-Rx pairs in close proximity

    I'm a bit confused. If your input scanning rate is slow, you can sample an input, transmit the appropriate data, and then wait an eternity before you scan the next input and transmit the next data,...
  8. Closed: Re: Operating four Tx-Rx pairs in close proximity

    Can you synchronize the transmitters so that only one is transmitting at a time?
  9. Closed: Re: Operating four Tx-Rx pairs in close proximity

    I'm not an RF guy, but I have to believe that if you've got four transmitters running at the same frequency, a receiver is going to get garbage.
  10. Closed: Re: Lamp Test Circuit with some other indications.

    There are thousands of diodes that would work. The two I recommended are extremely common; cheap and plentiful. What’s wrong with those? If you don’t like those, then just search for ones that meet...
  11. Closed: Re: Lamp Test Circuit with some other indications.

    Those are Schottky diodes. If you had actually gone to the trouble of reading the data sheet, you’d see that they have 1ma of reverse leakage current, enough to make an led glow. There’s no reason...
  12. Closed: Re: Lamp Test Circuit with some other indications.

    The ONLY possible current path is through reverse biased diodes. Either you've got something wired wrong, or those diodes are leaking.
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    Closed: Re: Change colors of liquid crystal display

    WHAT??? You had a white LED which gave a blue background and white numerals. Then you changed the LED to red, which gave you a red background with red numerals. But you want it to be black with white...
  14. Closed: Re: Lamp Test Circuit with some other indications.

    I’m not even sure WHAT this circuit does. Just a whole bunch of diodes.
  15. Closed: Re: Lamp Test Circuit with some other indications.

    You don’t tell us switch positions or component values or what that “volt meter” is, but I suspect you’ve got some leakage through your diodes, or something wired wrong.
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    Closed: Re: Spacing Between PCB Pad and HEATSINK

    I've seen the breakdown voltage of air listed as 1.1KV/mm; and as 30KV/cm. Not sure where those come from, and they're quite different. There's also Paschen's Law which establishes the minimum arc...
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    Closed: Re: Exact resistance output?

    Your MUX will also have some resistance. And a tolerance.
  18. Closed: Re: Digital Storage Oscilloscope - newbie questions

    1) what do you mean "normal"? Yes, there will be ripple on a regulator output. It depends on load, input, filtering...
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    Closed: Re: Generating the waveform as in the image

    1) buy a signal generator with burst function.
    2) use a dds chip
    3) use an fpga with a DAC and create your own dds.
    4) use a 3KHz oscillator and a fet switch to gate a 27MHz oscillator.
    5) etc.,...
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    Closed: Re: Electrical type for pins in Altium Designer

    What error?
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    Closed: Re: MCP6001 input voltage near rail (3v3)

    It shouldn't do that; either you're doing something wrong or your part is defective. Show your schematic.
  22. Closed: Re: large slack (Reg2Reg) after placement (IC Compiler & Physical design)

    More slack is a good thing, not a bad thing. Why do you want to reduce it?
  23. Thread: "Closed" thread

    by barry
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    2,018

    Closed: Re: "Closed" thread

    I turned off subscriptions, and it seemed ok for a while, but it’s back again. Seems it re-occurred after somebody responded to a thread I had previously responded to,(this one, actually)
  24. Closed: Re: Homemade music lighting system with controller board(s)

    Without knowing how much current each device draws, it’s impossible to answer your question.
  25. [SOLVED]Closed: Re: obtaining dielectric constant for of a polymer

    Maybe you should be asking how to do an internet search.

    This took me nearly 10 seconds to find:

    https://daycounter.com/Calculators/Plate-Capacitor-Calculator.phtml
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