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  1. kellys_eye

    what is the different between speaker wire and power wire

    Quite right - no 'subjectiveness' o_O needed - it's a pure scientific, measurable quantity and no human could possibly tell the difference. Indeed it would take extremely sensitive and expensive test equipment to prove the difference by measurement. But while there are gullible fools prepared...
  2. kellys_eye

    Smoothing a charging current for a phone?

    Since your supply source will vary between being 'too low' and being 'too high' you need a device called a buck-boost converter that delivers a stable output regardless of the input - providing you meet the minimum and maximum criteria the chosen module states.
  3. kellys_eye

    GPS Satellites Visible But No Fix

    I recall installing DGPS systems on ships a few decades ago. These relied on separate receivers to pick up correction signals sent from fixed base station on land. Such systems were fitted a part of DSP (dynamic ship positioning) systems such as mobile rigs and tasks like dropping sea anchors...
  4. kellys_eye

    Power a Raspberry Pi from a computer monitor power supply.

    You would need a small buck converter board that would accept a wide DC input and be adjustable to the required 5V output. There are many such boards available like this one...
  5. kellys_eye

    Determine Power Supply Requirements for Simple Circuit

    Get hold of a flashing red LED (they do exist) instead of the 12V lamp and then you can use your USB charger.
  6. kellys_eye

    what is the different between speaker wire and power wire

    Nobody can - despite what they claim. Although if I was selling the oxygen-free, silver-plated, zero-electron, warp-enabled fusion speaker wire at £1,000/foot and people were buying it....... I could change my mind :D
  7. kellys_eye

    Fuzzy noise from the PCB (home theater)

    SMPS's operate by varying the duration of a pulse according to the output load and to maintain a steady voltage. The 'noise' you are hearing is changing as the load does - increasing the volume increases the load, switching different systems in/out also changes the load. Once the load gets to...
  8. kellys_eye

    RGBs video signal unstable

    I'm confused. What do you want? A stable OUTPUT or a stable video INPUT? The whole wording of your query just doesn't make sense (to me) and I can't figure out what you've got, what your issue is or what you want. The video signal needs to match the monitors requirements - obviously. Either...
  9. kellys_eye

    Fuzzy noise from the PCB (home theater)

    Pictures don't show. Some modern SMPS (switched mode power supplies) make a high pitched 'hissing' noise when under different states of load (or non load). It's not usually noticeable and certainly shouldn't be loud enough to be heard with the covers on! or from (say) a foot or so away from...
  10. kellys_eye

    GPS Satellites Visible But No Fix

    I recently bought some extra land adjacent to my property and during the negotiation process the sellers wanted me to pay for centimetric GPS surveying to establish the boundaries. I got a tape measure out and did it manually and saved a few 100££. I had to - when I told them I wasn't paying...
  11. kellys_eye

    Arduino LED help

    60 LEds run at 20mA will consume 1.2A on their own - never mind multiple strings of them. Your PSU is vastly under rated.
  12. kellys_eye

    Send Wireless temperature sensor to Industrial cloud platform through REST API

    Underground mining? Or above ground? Underground wi-fi might pose some problems........
  13. kellys_eye

    40 Amp Block Diode Cathode to Stud 12 Volt Tech help needed

    The stud diode is only useful if you have a split-diode charging arrangement for ALL the batteries. We can only presume this is the case? If not, the use of the dinghy winch will draw from the dinghy winch battery until such time the dinghy winch battery voltage drops to 0.7V LESS than that...
  14. kellys_eye

    GPS Satellites Visible But No Fix

    Wow - that long ago! How time flies!
  15. kellys_eye

    Aiwa stereo model CX - N3200U

    It only takes 'slightly' to ruin the operation! Many of those tuned circuits are potentially known as 'critically tuned' - for a reason. If you only adjusted one or two of them then you can fix any issues by rotating the cores SLIGHLTY in either direction to see if there is any improvement...
  16. kellys_eye

    GPS Satellites Visible But No Fix

    What positional accuracy are you seeking? GPS accuracy is deliberately degraded - it's a military system after all . Precision position accuracy (centimetric) is expensive and uses differential correction systems. Select ONE system and see if that makes a difference.
  17. kellys_eye

    TPA3122D2 Class D Amp ticking sound and produces no music

    What PSU are you using? Show your component layout.
  18. kellys_eye

    Choosing a 32 Bit MCU

    If the hat fits........ Rejection of a design is usually on a cost and/or reliability basis - maybe even code security and potentially security of supply - but if all those criteria are met then I don't know why any development department would reject one - didn't they tell you why? Do you...
  19. kellys_eye

    Building a timed motor circuit

    I use a similar system to open/close a hatch to my hen coop! I used the KISS principle and a couple of relays with reed switch sensors to detect open/closed and an electronic timer to open/close at the appropriate times. There are loads of examples on Youtube - perhaps you might want to look...
  20. kellys_eye

    Aiwa stereo model CX - N3200U

    They are variable inductors (tuned circuits) used in the radio circuitry. DO NOT ADJUST THEM!
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