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  1. kellys_eye

    Small cheap short Wave/Mp3 player

    lol - in the last few years there has been massive changes in both technology and, more so, the pricing associated with it. You can usually find a pre-made solution to any electronics problem these days - and if not a direct solution then at least the various modules necessary to create one! At...
  2. kellys_eye

    12v In A Bathroom

    It's basically 1/20th of a kWhr (a standard unit for pricing electricity) so if you pay 10c/kWhr then the cost of running the mirror is 0.5c per hour. Still a 'stupid' way of stating power consumption though.....
  3. kellys_eye

    Maximum battery charging using small generator idea

    Efficiency is a relative concept in this situation - you could be talking about saving a coffee cup of fuel in a 12 hour charging period.... worth the effort expended? The KISS principle applies unless you have the time, money and inclination to go the full 'hog' and nitpick the solution. And...
  4. kellys_eye

    Transformer identification

    Do you have the right rating fuse fitted - this type of amplifier often uses toroidal transformers known for their high in-rush current and need for anti-surge type fuse in the supply line.
  5. kellys_eye

    LED id

    You want 'water clear' red LEDs (I'm presuming they are all red?) in a 3mm package. But without knowing the exact spec of the originals you may have to play around with series resistor values to get matching brightnesses.
  6. kellys_eye

    Replacing light bulbs with LED's for illuminating a radio's scale

    Have you searched for modern MES light replacements? They do exist and are simple screw-in replacement without all the hassle. Not exactly cheap (Farnell list them at around $10 each) but I suspect there will be cheap Chinese equivalents via the likes of eBay such as this one...
  7. kellys_eye

    ESN

    There are some 'peculiarities' to your results. This seems to stem from where the digits are 'split' to apply the conversion. In your first post you use 63843 and this converts (using the last 4 digits to HEX) to 6F03 correctly (note the '6' stays the same as converting it to HEX gives the...
  8. kellys_eye

    12v In A Bathroom

    The manufacturer will list the specifications to include power consumption but generally they take around as much as a small light maybe 10W to 50W (???) depending on mirror size/shape.
  9. kellys_eye

    Metal Door Loop

    ??? What is it to be used for?
  10. kellys_eye

    Small cheap short Wave/Mp3 player

    eBay has a gazillion listings for MP3 boards with such facilities and they can be purchased for only a few $. http://www.ebay.co.uk/itm/TF-Card-U-Disk-MP3-Format-Decoder-Board-Aamplifier-Decoding-Audio-Player-Module-/201539612709?hash=item2eecb27025:g:-QcAAOSwEeFVC~Q3
  11. kellys_eye

    12v In A Bathroom

    Assuming you're talking an isolation transformer then no. Some 'transformers' are SMPS (switched mode) and isolation may be suspect. The transforming device will have the internationally recognised 'double-isolated' symbol (a square within a square) signifying its suitability. To be perfectly...
  12. kellys_eye

    Roland XP60 no sound

    Checked the lead from the keyboard to the amp? What about the settings on the keyboard - daft as it seems, is there a separate volume control you need to 'turn up'?
  13. kellys_eye

    Need help in display connetion with pcb

    No. That's what's called 'zebra strip' but it is available online if you search. It rarely goes 'wrong' - most faults occur when the mating surfaces are contaminated in some way. Give all surfaces that meet (both sides of the strip and the two plated mating surfaces) a thorough clean using...
  14. kellys_eye

    Board design help! Some buttons and led on a perfboard

    You get what you pay for. epoxy boards are the best (for general amateur work) and the stuff you had (failed) was probably SRPB (synthetic resin bonded paper) that is ok for many low frequency circuits but varies a lot in quality. The key to look for is the centrally placed drilled holes - if...
  15. kellys_eye

    How to Figure out What Power Supply to Use (Battery Conversion)

    The original wire from the blinds can stay - anything over (say) 12-15ft and you should change to 18AWG. Don't forget that the current flow 'splits' at a certain point to enter the individual blinds. It's only the run from the power supply to the point at which you split it off in three...
  16. kellys_eye

    CCtv camera looses picture

    If a similar camera on the same video port doesn't replicate the fault then the camera is faulty.
  17. kellys_eye

    How to Figure out What Power Supply to Use (Battery Conversion)

    It's recommended to keep the volt drop under 10%. In your situation you may (maybe?) never use all three blinds at once but assuming worst case..... The 2.1A total requirement would result in a 44% volt drop using 24AWG !!!! 18 AWG gets this down to (near enough) the 10% mark so aim for that...
  18. kellys_eye

    Maximum battery charging using small generator idea

    A car alternator is the ideal solution - built-in regulation (on modern alternators anyway...) and plenty of current when needed. Of course, modern chargers will make your batteries last longer...
  19. kellys_eye

    How to Figure out What Power Supply to Use (Battery Conversion)

    Get a PSU that will deliver AT LEAST the sum total of the required current(s). The blinds will only 'take' what they need, no more, no less, so providing your power supply can deliver the MAXIMUM required (all three blinds running at once) then anything of that rating or larger will work. And...
  20. kellys_eye

    Transformer identification

    Post the schematic. The most likely cause is either a dud power supply or a short in the output stage(s). As mentioned, the transformer is (possibly) the last source of such problems.
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