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  1. kellys_eye

    Help with faded LCD display

    It's a capacitor - yes, leave it in place.
  2. kellys_eye

    Help with faded LCD display

    That's a 'bog standard' 16-character 2-line LCD with built-in interface that should be readily available from many outlets. Here's a typical example. https://www.ebay.co.uk/itm/301015639799?hash=item4615ee26f7:g:eGkAAOSwaB5XkIta You might have to search around a bit for a module with the...
  3. kellys_eye

    I need advice on how to solder these 12 fuses in this power inverter

    That'll be why the inverter was 'junked' - simply replacing the fuses will only mean you having to buy MORE fuses as they'll just blow again unless you discover WHY they blew in the first place.
  4. kellys_eye

    Camera Modules

    I now have a collection of PTZ cameras (old style - 540 line, PAL, 26x mechanical zoom etc) - five fully operational domes and the same number of dome 'internals' that comprise the main control/connection boards and what are known as 'camera modules'. These modules are self-contained...
  5. kellys_eye

    "Expensive" keyboard repair - ROCCAT Ryos

    The keyboard presumably connects via USB and if it is not being recognised then perhaps the USB interface is faulty? Some devices have a dedicated USB-serial interface device, in which case it would be feasible to test/replace as required however sometimes the interface is part of a controller...
  6. kellys_eye

    "Expensive" keyboard repair - ROCCAT Ryos

    Error 43 is a driver issue. What operating system are you using and is the keyboard meant for the system you're using? What is the warranty on the keyboard? Does an ordinary keyboard work ok? Have you checked with the OS manufacturer (presumably Micro$oft) for potential issues? Is the...
  7. kellys_eye

    Bell pull project

    LOL - yes, my in-laws have such a system fitted and have gone to extraordinary lengths to keep the system working as they rennovated the property over the years. God alone knows how much they spent and the inconveniences they've suffered to keep it going! I'd have happily put in an electric...
  8. kellys_eye

    PCB VIA

    There are commonly 4-layer and 8-layer boards readily found in consumer units and, in fact, it is possible to go up to 100 layers!
  9. kellys_eye

    Bell pull project

    Plain old wireless door bells will do that - there are some systems 'out there' that have a different ring tone for each of the multiple bell pushes that you fit.
  10. kellys_eye

    find replacement for power transformer

    Rule of thumb for smoothing caps is 1,000uF per amp. Anything larger (in capacity) is ok too. Rule of thumb capacitor voltage should be 1.5x the DC output of the bridge rectifier (in your case a 50V or higher capacitor will suffice). The bridge rectifier will drop 1.2V (0.6V across each pair...
  11. kellys_eye

    Video signal DC level adjustment

    Coax? I'd be using a balun and CAT5 over those distances.
  12. kellys_eye

    find replacement for power transformer

    You could use a transformer with an 18V AC secondary (no centre tap) and a bridge rectifier/smoothing cap to deliver around 25-26V to the circuitry. No special reason for the centre-tapped version.
  13. kellys_eye

    find replacement for power transformer

    Stereo amp and no centre-tapped secondary (or two separate secondaries)? I find that strange. Most push-pull output circuits require a +/- rail. Surely you mean a 22-0-22 secondary? These should be fairly common (or voltages thereabouts). The 6V secondary might deliver a low DC to a...
  14. kellys_eye

    Geometry issue and error in Philips 27ps55s CRT TV

    my bold.... I was commenting on, not only the rarity of anyone still having a CRT set for everyday use but the OP's implication that someone would have an identical model! That gives another level of 'rarity' to the request! Being (also) as I'm a long standing member of a vintage radio/TV...
  15. kellys_eye

    Weird fault, need help

    Are you a competent user of a soldering iron? Too often people just re-heat solder joints thinking it will affect a repair when you really need to re-FLOW (new solder/flux) the joint.
  16. kellys_eye

    UCC28070A PFC controller ramp circuit?

    You do realise app notes aren't 'gospel' (and not meant to be).
  17. kellys_eye

    sherwood ra-1140

    There are some advantages in having only 1/2 a stereo working - the other half of a dud stereo is a DUPLICATE of the working half! You can make comparisons (voltage checks) using a test meter and there is a recognised procedure for doing this. Find the service manual (online) and upload the...
  18. kellys_eye

    Geometry issue and error in Philips 27ps55s CRT TV

    Seriously? It's over 20 years old! Does ANYONE still have a CRT television these days?
  19. kellys_eye

    reed switch and tiny motor NO arduino

    Depends on the reed switch and the motor being used. The motor will draw a certain current and the reed switch contacts must be able to carry that current. Typically, reed switches can carry around 1A maximum therefore your motor should be rated UNDER 1A. You can, of course, increase this...
  20. kellys_eye

    Pitcher to Catcher speaker

    Edge (slope) detector. A circuit that detects when audio is being played (and switches it's output 'high') then, when the audio stops, switches it's output 'low'. You can then use the changing state - i.e. high-to-low transition - to activate the second audio stream. You aren't so much...
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