Search results

Search Forums New Posts
  1. kellys_eye

    Modify a motorized projector screen to run on batteries

    Two potential issues. If the actual DRIVING MOTOR is a DC device then using a battery pack is perfectly feasible. If the motor is an AC version then, as suggested, an inverter would be required. If battery operation is a specific requirement then I suggest you seek a screen that has that as a...
  2. kellys_eye

    Servo or stepper? Help please!

    That motor arrangement looks suspiciously similar to the old fashioned electric screwdrivers. Small motor, planetary gearset, high torque output etc. I have an old Black&Decker model that could turn a 747 engine over! (it's battery is knackered now though). If I wanted to make it work faster...
  3. kellys_eye

    Electric motor cooling

    There are fluid coupled fans (as used on some car radiators) that use temperature as the coupling effect to the fan itself such that the hotter the device runs the more 'coupled' the fan is (to the drive shaft) and therefore more air flowing over the motor. No electronics, no power supply...
  4. kellys_eye

    Trying to create a sunrise/sunset power up/down LED strip

    If you place a strip of white LEDs inside an opaque container you can use a simple clock and decimal stage counter to switch on the LEDs in sequence (from zero on to 'all' on in whatever-second steps you require). The opaqueness might be able to hide the individual point-lights. A bit...
  5. kellys_eye

    Multimedia LED light/sound project with multiple zones. Help!!!

    Have a look at some examples like this: There are also specific construction details on the likes of the Hackaday site.
  6. kellys_eye

    Wire Size for Security Camera

    Always true - but your insurance company might have a different outlook. TBH it's never been an issue for me....
  7. kellys_eye

    Why Do DC Inverters Damage Items?

    I've got the 7500W version but use smaller (750W and 2000W) inverter gensets (iMpax models) for my electronics.
  8. kellys_eye

    Wire Size for Security Camera

    If the cameras are indeed 12VDC then I would avoid using 'local' AC power packs and feed them from a DC source closer to the DVR. Most 'shotgun' video cables take 12VDC/video and the DC side of it is pretty light gauge stuff - indeed I fit a CCTV system at home by using old CAT5 cable as the...
  9. kellys_eye

    Question: Is my router repairable?

    I'd try to find the output voltage of that regulator and feed the corresponding DC in AFTER it to determine if the fault went further than the regulator itself as you could be wasting time, money and effort trying to fix the regulator part only to find the rest of it has gone mammaries skywards...
  10. kellys_eye

    Why Do DC Inverters Damage Items?

    I've been changing all my gensets to inverter-types, they now all have a 'pure' sine wave output. Although I haven't had any particular issues with waveform distortions (either via a modified sine wave or harmonics) I run a lot of compressors as well as electronics on-site and don't want to...
  11. kellys_eye

    Soldering Problems

    I wouldn't use lead-free solder to start with. Use a flux-cored solder to get the technique right. Only use lead-free where you have to (it's not a legal requirement for hobbyists). Secondly, what is the physical size of your soldering iron tip. Temperature has less to do with it than the...
  12. kellys_eye

    Multimedia LED light/sound project with multiple zones. Help!!!

    You probably answered your own query with the immediate description of the materials to be used - addressable strip LEDs. Given these are fully programmable and that there are many libraries available for operating them, your software knowledge should be sufficient to finish the 'small...
  13. kellys_eye

    CCTV cameras

    Terrific! I didn't even consider the WBM as a source. Nice find!
  14. kellys_eye

    CCTV cameras

    .....by which comment I'm assuming you're 'CCTV savvy'??? Either way, here are some pics: Sorry about the focus - will do better later.... The label on the device says notalot i.e. Model Twilight PTZ 27IR and the one result I get from Google shows a downloadable user manual that doesn't...
  15. kellys_eye

    CCTV cameras

    Before going any further I suppose I'd better ask - are there any CCTV-savvy people here or should I be going to a 'dedicated site'? Anyway, the question is going to be related to some pan/tilt Sony cameras I've been given. They have a multi-core cable along with the usual coax (video) and...
  16. kellys_eye

    Sun beam mattress controller flashes

    If this is a heater then I'd not mess with it. The chances of receiving an electric shock and/or starting a fire are too high. In this particular case it would be sensible to dispose and replace.
  17. kellys_eye

    Power Supply for Multiple Components

    Invest in rechargables. They'll last longer in use and can be recharged some 500 times before needing replacement. If you're ok with running cables to the battery boxes (could be unsightly in an application?) then a single PSU will work IF you only operate one blind at a time. The actual...
  18. kellys_eye

    LCD replacement

    Sorry, the listing ended! You can see loads of examples if you search using 'LCD driver board's like this one (for now!) https://www.ebay.co.uk/itm/M-NT68676-2A-HDMI-DVI-VGA-Audio-LCD-Screen-Controller-Board-driver-Monitor-Kit/152550528547?hash=item2384b85623:g:rbIAAOSwOMdZUH-4&redirect=mobile
  19. kellys_eye

    Battery capacitor, why?

    The capacitor is of a value that wouldn't (imho) make any difference to EMC tests, fitted or not.
  20. kellys_eye

    Battery capacitor, why?

    If the battery is made up of lithium cells (i.e. multiples of) then there will be some form of 'balancing' circuitry built in and the capacitor will be associated with smoothing/decoupling the supply to that circuitry. It should not affect any EMC tests.
Top