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  1. kellys_eye

    Treadmill Switch Repair

    The button on top of the switch..... is it a removable cap? If so, where's the 'broken one'? Measure the switch dimensions - they are fairly standard - and as @Minder suggests, trawl over to Digikey and use their parametric search facility to search for 'switch'....'pcb mounting'.... two...
  2. kellys_eye

    Xbox One Motherboard New and DOA

    Have you searched Google for any tips'n'hints for fault finding that board? You don't specify which model it is either..... Google results should give some indication of what the symptoms point to in regard to the fault. If it is main processor related then you're not going to get very far...
  3. kellys_eye

    Repairing Cummins Marine alarm board

    Start by simulating the other alarm conditions that the board monitors - I suspect you'll have lost a lot more than just those two alarm functions....... Then disconnect the board (mark the location of all the connectors etc to facilitate CORRECT replacement) and then post larger, brighter...
  4. kellys_eye

    What a battery charger looks like

    Many people make the mistake of using the 'smallest piece of stripboard they can get away with' when first using the stuff. It's not really that expensive so try to use as large a piece as you can fit in the casing (or even use a bigger case). This way you will find it easier to rework the...
  5. kellys_eye

    Controlling Goteck Linear Servo Micro Analog 1.5g GS1502

    Because the position requires fraction parts of mS to be accurate. Are you sure you're sending the correct type of signal i.e. a variable WIDTH rather than a variable POSITION pulse?
  6. kellys_eye

    Using Raspberry Pi to read signal generated by a function generator

    You will need a peak detector and a timer interrupt to do that. Currently all you are doing is taking repeated measurement of the amplitude of the signal - which tells you nothing!
  7. kellys_eye

    Arduino Nano LEDs pin failure

    If you apply a NON CURRENT LIMITED supply to any LED you will fry it...... i.e. if you don't use a series resistor it's toast (with a possible exception of using a voltage lower than the LED's forward voltage). If you are using LEDs with built-in current limiting resistors you're OK but I...
  8. kellys_eye

    Xbox One Motherboard New and DOA

    Is that a damaged capacitor?
  9. kellys_eye

    Arduino Nano LEDs pin failure

    Do you have series current limiting resistors on each LED? What current are you running the LEDs at? Are you sure they are all positioned correctly i.e. polarity? Are you sure they are all working ok? Send code to LEDs individually to see if they light correctly.
  10. kellys_eye

    A thanks to this forum

    Thanks works both ways though..... you'll be surprised at how many people took an interest in your project (me for one) and derived a level of 'pleasure' from reading the threads!
  11. kellys_eye

    Controlling Goteck Linear Servo Micro Analog 1.5g GS1502

    It should be simplicity itself to modify the timing loop in any Arduino servo driving library so regardless of its suitability I reckon you should throw it together and try!
  12. kellys_eye

    Zero ohm resistors.

    Would using standard 0.1Ω 1/4 watt resistors actually make a difference to your circuit operation?
  13. kellys_eye

    Long life rechargeable battery pack

    You need to know the actual power being used - then you can chose your battery (chemistry) and pack size to suit however long you wish it to last. i.e. if your light takes 12W (same as 1A at 12V) then you need a 12V battery that can store at least 1A for one hour or 2 amps for two hours etc. A...
  14. kellys_eye

    Low-Profile Temporary Metal Rivets

    Not so sure anything so temporary as a 'spring-loaded' device would afford the pressure/clamping levels necessary to ensure safe location of the material. Are you willing to risk losing a milling/cutting head and a damaged design for the sake of a few minutes using 'secure' bolts? I recall...
  15. kellys_eye

    Zero ohm resistors.

    :confused: that would mean reworking/remaking (i.e. etching) the board! Most (all?) PCBs that require testing use the bed-of-nails method (for hi-speed testing) that wouldn't require 0Ω links anywhere. I don't follow your methodology :( <edit> just re read your older post - this is something...
  16. kellys_eye

    Xbox One Motherboard New and DOA

    The XBox is a 'PC' by another name and fault location follows the same basic methods therein. ISTR that a lot of issues were around the BGA mounting of the main processor. 'Some' people had success in re-working the connections by reheating the area under the device to reflow the solder but I...
  17. kellys_eye

    Using Raspberry Pi to read signal generated by a function generator

    In what way are they 'undesirable'? What are you 'expecting' to see? The values you get will correspond to the instantaneous value of the waveform at the time when the sample is taken i.e. if you sample it at the peak of the waveform you will 'consistently' measure the peak amplitude but if...
  18. kellys_eye

    Centre tapped Transformer

    The readings you give are consistent with a 4.5-0-4.5V (i.e 9V centre-tapped) transformer. This is NOT THE SAME as a 9-0-9V transformer. Have you checked that the primary voltage is correct i.e. you're not running a 240V primary on a 120V supply?
  19. kellys_eye

    Series Voltage regulator.

    What voltage do you need to drop across R5 in order to make Tr3 Vbe conduct? And since R5/TR3 is designed to limit the CURRENT flowing to the output you have to know what that limit is.
  20. kellys_eye

    Using Raspberry Pi to read signal generated by a function generator

    Have you looked at the datasheet for the device? It's a simple matter of applying it to the analog input pin(s) !!! Just make sure the ground connections of both circuits are commoned together and power them accordingly. Or look at this website...
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