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  1. kellys_eye

    Bench PS mains switch arcs when switched on...

    Do you have the specifications for the switch? They actually have a 'rating' and if you don't have the right type then it will arc 'uncontrollably' - potentially leading to damage and/or fire. Sound to me like you're using a small DC-rated switch where an AC-rated one should be present and/or...
  2. kellys_eye

    Adapting power output

    OK, your phone gets hot..... but if it was a problem then the manufacturers would have addressed it else it is of 'poor design'. Is this heat a particular issue for 'you' or for the phones operation in general? Does it fail? Does it burst into flames? If you are doing this to satisfy your...
  3. kellys_eye

    12 volt door latch wiring

    Think along the lines of a DOOR catch - the type that (if you look closely) has one edge flat and the other 'curved' (to allow the door catch to close). Add a solenoid to a catch of this type and, using a ONE-SHOT (monostable) circuit, the solenoid will pull for the 'period of the one-shot' and...
  4. kellys_eye

    Comedy Thread

    Not quite: ex = 'has-been' spurt = "a drip under pressure"
  5. kellys_eye

    Does anyone have history with measuring linear distances?

    Put one turn around a pulley of known diameter and measure the rotation of that pulley.
  6. kellys_eye

    24volt 3000watt inverter

    Using gas for kettles and toasters would be my preferred solution - using a smaller (and better quality) inverter for just the electronics i.e. TV, laptop, phone charger etc. Kettles/toasters are 'current hogs' and would cause a LOT of problems if things went wrong. Since they are generally...
  7. kellys_eye

    Need Help With 12v Darkness Detector

    What's the gain of the transistor?
  8. kellys_eye

    24volt 3000watt inverter

    10A at 24V is only 240W. You could run a TV from it (around 50-150W) but NOT a toaster or kettle (1kW and over). For the higher power devices you MUST use a hardwired connection to the inverter and the connections MUST be very secure and properly fused.
  9. kellys_eye

    40 Floppy disks for...

    Nope - your disks, your pleasure. But even a 386/486 will (most likely) boot from a HDD.......
  10. kellys_eye

    Is the following a universal gate?

    Make your typical logic state table and, using fixed states for X and Y, determine the output states. Do you know the 'type' of gate that can be used exclusively for 'universal' gate use?
  11. kellys_eye

    40 Floppy disks for...

    What for? The knowledge that they 'might' keep the data safe? What about data density? Will you have any software that won't require ALL of those disks just to keep one application on? I recall - in the halcyon days of 3.5" floppies, having collections of 20-30 disks just to hold something...
  12. kellys_eye

    Load monitoring for new Extension power cables

    The values stated by the OP are as per typical extension leads available across the market: https://www.toolstop.co.uk/defender-e85111-extension-lead-16a-1.5mm-14-metres-yellow-110v-p79648 The site transformer/distribution unit should, of course, be fitted with a 16A breaker. If via a site...
  13. kellys_eye

    Load monitoring for new Extension power cables

    The specification for all (properly installed) cables accounts for any load within the design specification and there is no reason to 'extend' that spec unless you are deliberately abusing it. Design spec can accommodate intermittent use and continuous use but they will always include the...
  14. kellys_eye

    Load monitoring for new Extension power cables

    Why? If the cable is correctly rated (which it should be) then the volt drop 'should' be acceptable at any load - else you're overloading the machine on the end of the cable anyway - not a good thing.
  15. kellys_eye

    Making a variable power supply variable... (what?)

    Can't you use a small negative voltage rail to pull the bottom of R2 to a value below zero?
  16. kellys_eye

    Starter Project: Camera and Live Feed

    They'd have changed anyway so why bother?
  17. kellys_eye

    Hello, can somebody help wich transistor is like bfg520

    Isn't that one obsolete now? Either way, if you use some supplier websites and their parametric search function, some sites even have multisim files for the devices (iirc).
  18. kellys_eye

    40 Floppy disks for...

    They didn't see you coming - they sent for you. Getting $1 for something worth nothing is an achievement in itself.
  19. kellys_eye

    Load monitoring for new Extension power cables

    If you know the load, the voltage and the distance to/from source to load you don't need to 'monitor' anything. You can calculate the MINIMUM cable specifications for the permitted volt-drop. Protect the cable using the appropriate circuit breaker (with RCD for 'people protection') and that's...
  20. kellys_eye

    Modify chinese high power LED to emit less light/heat?

    They make LEDs in the West???
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