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  1. kellys_eye

    Conundrum using resistors? (Raw rookie)

    100Ω in each LED 'leg' is correct (assuming a 20mA draw on each LED) but as above, if you measure it 'open-circuit' you will see 5V. Connect the LEDs and measure again - it will be 3V.
  2. kellys_eye

    Low-ESR 1uF electrolytic (hard to find)

    Are the capacitors you are concerned for actually connected in 'high ripple' circumstances? Values for ESR are smaller as the value of the capacitor drops so sub 10uF become less of an issue unless you're talking HF ripple in SMPS outputs and decoupling locally (say at IC's) which is then...
  3. kellys_eye

    SCADA

    It's a mix of programming and sensor understanding. Most SCADA systems use a mimic display (basically a graphical representation of an industrial process) that shows levels, flows, valve status, alarm conditions etc and users/operators/technicians may be involved with designing the graphical...
  4. kellys_eye

    Newbie attempts to fix world/TV Samsung BN44-00264c

    The resistors and capacitor are straightforward as far as availability is concerned. The IC is the 'dodgy' part - I can only find an eBay supplier (American). It's not expensive but it's the 'hassle'..... http://www.ebay.ie/itm/ICE3BR1065JF-ICE3BR1065-Current-Mode-Controller-IC/270757868966
  5. kellys_eye

    Low-ESR 1uF electrolytic (hard to find)

    Why not just use the right part - the tantalum? If they aren't broke, don't fix them. Tantalums are not inclined to 'explode' in audio signal paths - they tend to do so on power supply lines though.... even then, not 'always'.
  6. kellys_eye

    Newbie attempts to fix world/TV Samsung BN44-00264c

    OK, sorry for the misleading post.... Got the schematic now and the following details are shown: OK, CM806 is a 100pF 1kV ceramic capacitor. RM831 is 0.4Ω 1 watt. The control IC (on the heatsink) is ICE3BR1065JF...
  7. kellys_eye

    Newbie attempts to fix world/TV Samsung BN44-00264c

    Gimmee a minute - I'm downloading the manual - it has a full schematic...
  8. kellys_eye

    Calculating Resistance With Just Voltages? Basic DC Circuit Design

    If you are using voltage regulators you won't need the resistors. Now you have to consider the power dissipation in each regulator - this will equal the (volts in minus the volts out) multiplied by the current being drawn. Answer is in 'watts' and must fall within the capability of the chosen...
  9. kellys_eye

    Best place to buy parts and components?

    Try ESR Electronics (Cullercoats, Tyneside). I used to shop there and now order online from them instead - great service, good selection and always in stock. https://www.esr.co.uk/ For the more obscure or esoteric parts you 'might' require just use the bigger suppliers like Farnell and/or RS...
  10. kellys_eye

    Raspberry pi Error

    You would need ot make a careful check (eyeball) of the board to see if there is any physical damage. Static electricity can damage boards but, generally, if they are 'complete' boards this is less of an issue. Look at the actual socket (video) on the board and see if it is still soldered...
  11. kellys_eye

    Newbie attempts to fix world/TV Samsung BN44-00264c

    Google is your friend - when they're not spying on you of course.... http://www.ebay.co.uk/itm/SAMSUNG-BN44-00264A-BN44-00264B-BN44-00264C-POWER-SUPPLY-REPAIR-KIT-/182503916237?hash=item2a7e14c2cd
  12. kellys_eye

    Help with increasing the power of a Philips hue bulb Frankenstein "hack"

    There's no practical or easy way to do that. The transformers at the end of the board will have to be redesigned to fit with the increased control current/voltage that will be required. Indeed, running a higher load than the board was designed for will eventually cause it to fail.
  13. kellys_eye

    Automatic battery charger. Type of Transformer.

    Replace it any way. For the few cents it costs, why take the risk? Of course there may be other faults in the circuit but you have to change the capacitors first anyway.
  14. kellys_eye

    Newbie attempts to fix world/TV Samsung BN44-00264c

    Blue 'bead' is a tantalum capacitor - well known for their spectacular failure modes..... The fault is common and well commented - indeed there are usually videos on Youtube specific to these boards so have a Google for the many 'kits' that are sold with all the relevant parts in them.
  15. kellys_eye

    Panasonic DECT 6 base station and registering handsets

    Seems as if you're going to have to try some serial port reading! I can't see any other way of changing the parameters.
  16. kellys_eye

    Raspberry pi Error

    Could be a problem with your monitor! Is the lead to it ok?
  17. kellys_eye

    Panasonic DECT 6 base station and registering handsets

    Which is why I suggested you pop the unit open! Post a pic of the board (top side and bottom side) and there's a good chance we can figure out if there is such a facility.
  18. kellys_eye

    Rechargeable Power Supply Question

    You need to supply more specifications. How much power does the fan use? How long do you want to fan to run, on battery power, for? This data is required to determine the size of battery and the consequent charging system to be used.
  19. kellys_eye

    Panasonic DECT 6 base station and registering handsets

    Pop the base station open and have a look for any links that may be associated with a 'reset' function - much like clearing the CMOS in a PC perhaps?
  20. kellys_eye

    my power supply device rated 13.8vdc output but I've test it and the output voltage is 26.8vdc

    Yes - here's something with more information: http://messui.polygonal-moogle.com/cb/ps_m9545.pdf The output is clamped with a 15V zener so we can assume it's gone open - I suspect the 2N3055 has also gone short c-e
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