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  1. kellys_eye

    LED for electric heater (UK)

    Wired as I suggest there will be ALWAYS be a light on if power is applied to the heating element. It could be the rocker switch light or the thermostat light but ONE of them will be on. The heater will only ever be 'safe' when ALL the lights are off. It doesn't matter how the thermostat is...
  2. kellys_eye

    Can you identify this part for me ?

    yes, check that the central contact is actually touching the base of the lamp - it occasionally gets compressed to the point that it fails to reach the base. Power OFF when doing this, of course.....
  3. kellys_eye

    LED Dimmer suited for task?

    But not from the same supplier you bought the original device.........
  4. kellys_eye

    Can you identify this part for me ?

    The voltage dropped by the capacitor is a function of both the capacitors value and the frequency of the supply (50Hz or 60Hz) through it - whilst small changes in value may be acceptable it is best to keep as close to the stated value as you can. The voltage rating is not negotiable - it...
  5. kellys_eye

    LED Dimmer suited for task?

    Check the data sheet - 275V AC but 560V DC - there are others in the range too.
  6. kellys_eye

    Homemade Coil Help

    The arrangement of wire (paper clip?) needs to be set such that movement causes the circuit to be made/broken as it is the interruption of the supply that causes the large back-emf in the coil to deliver the 'shock'.
  7. kellys_eye

    LED for electric heater (UK)

    When the thermostat is 'off' the neon will be lit (but the rocker switch won't) and vice versa. You will always have an indication of power being applied - which is, I believe, what you're trying to achieve?
  8. kellys_eye

    LED Dimmer suited for task?

    Isolation isn't a specific requirement if, as mentioned, the circuit is built into an insulated enclosure and the pot shaft is likewise insulated. The 'important' part would be the 0.33μF capacitor which should be X2 class and have a 'bleed' resistor (say 330k) across it.
  9. kellys_eye

    Can you identify this part for me ?

    The 425J reading equates to 4.2μF so the value seems correct.
  10. kellys_eye

    Bloody tv " I think"

    Backlight issue? Use a torch, shining at an acute angle, to see if you can see the image - it will be very dim but should be there..... if it is then the backlight needs repairing (common fault).
  11. kellys_eye

    Can you identify this part for me ?

    That's a large polystyrene capacitor with (probably) a resistor across it (for discharge) and potentially (I say potentially because I can't see the rest of the circuitry) to power said light - which may be a UV LED???? Such capacitors are used as volt-droppers to power low voltage...
  12. kellys_eye

    Changed part of same specification but doesn't work

    is ROMLESS ....and 'seems' isn't a good enough check to establish that they are IDENTICAL....
  13. kellys_eye

    LED Dimmer suited for task?

    Where in the pot? It looks like a very basic DIAC/TRIAC arrangement for dimming but doesn't seem to have any snubber components. Equally the track clearances between screw terminals is ABYSMAL !!! Dangerous etc. You may have heard arcing across them.
  14. kellys_eye

    Homemade Coil Help

    It's unlikely the windings have gone bad. Have you fitted batteries and tested it?
  15. kellys_eye

    One for the New Year

    Whilst I can't show any 'happiness' at your answer it does please me that you are familiar with the issues and therefore less prone to making inappropriate decisions based on the results! We can all equate with 'nerdy desire' though :p
  16. kellys_eye

    General capacitor question.

    Identical replacements are often an issue. Provided you obtain a device with a voltage rating of AT LEAST the value being replaced (higher is ok, lower is NOT) you will be good to go. You can even, in many situations, use alternative values of capacitance as electrolytics often have tolerances...
  17. kellys_eye

    SOME NEWBIE question about 74ls74 and 74hc74

    Logically the devices are identical. Have you determined the difference between the 'LS' and 'HC' designations? As to real-life applications....... that's just far too wide a request as to be answerable.
  18. kellys_eye

    One for the New Year

    Addendum - the guy I refer to in post #1 isn't the 'Tech Guy' but is on Youtube as 'The Signal Path' (my bad) and the variable AC supply is this one:
  19. kellys_eye

    One for the New Year

    I'm undecided on the practicalities of homebrew medically-orientated devices given that the information they might produce could be easily mis-interpreted. If it's purely for experimental use then excellent - there is a lot to be learned from such interfacing. I'd be too concerned that reading...
  20. kellys_eye

    Programming micro controller of massage chair

    The answer is yes. But you have to know that: (a) the device is actually reprogrammable (i.e. data is not stored in ROM) (b) that you know the coding in use (i.e. the language) and that it is accessible i.e. unencrypted (c) you know WHAT parameters need changing (d) you know WHERE to access...
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