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  1. kellys_eye

    A total beginner needs help on a simple 'beat the buzzer' project.

    Wire coat hangers seem to work well. Cheap, easily available, stiff - connect them using 'choc-bloc' screw terminals - make the wand using the same stuff.
  2. kellys_eye

    Help selecting my 1st DSO please.

    Or, as Penny(?) once asked... "who is the best super hero"...... (Stuart) "aaaarggg.... you can't say that out loud - do you want to cause a riot?" Let the fun begin...... :D
  3. kellys_eye

    my LG plasma

    My crystal ball reports your set is 'broken'. But without any make, model number etc it's pretty hard to guess the answer based on 'LG'......
  4. kellys_eye

    Recommend UK calibration service please?

    I was going to suggest scullcom for a reference voltage! Nice to know we're on similar thought lines. Clearly you have more than is required for a amateur setup and I can now understand your reasoning for accurate references. Sadly I have no further assistance to offer re a cal lab - when I...
  5. kellys_eye

    Electronic keyboard won't turn on

    The power socket looks quite worn but if it is soldered directly to a printed circuit board (as opposed to being wired by flying leads) then quite often the act of inserting the power plug eventually breaks the tracks of the circuit board and some 'extra solder' (and a good dollop of epoxy glue)...
  6. kellys_eye

    Help fixing TV Panasonic TX-P42UT30E

    ... I need the pics from the 'cold' area! Anyway.... if the schematic you found is anything to go by, check out the diagram below: You need to 'chase' the supply continuity from the AC cord input, via the fuses, L101 and filter, up through the bridge rectifier and to L601/602, D607/608 and...
  7. kellys_eye

    Speed controler

    Gearing offers torque multiplication - can your motor supply the required torque WITHOUT them?
  8. kellys_eye

    RF sensor to detect cat

    Put a dog on the inside of the window.
  9. kellys_eye

    Help fixing TV Panasonic TX-P42UT30E

    Yeah, without the schematic this isn't going to be easy.... All I can suggest is a methodical approach. Starting at the AC input, the input filter components (where a transient absorber may have popped) then to the main rectification and smoothing. A mains supply surge 'shouldn't' get past...
  10. kellys_eye

    Help fixing TV Panasonic TX-P42UT30E

    Can we see a picture of the genuine article? It may be possible to identify a fault from a close up image.
  11. kellys_eye

    Need help with finding audio input

    Hmmm, the pictures reveal some differences to my original thought. There is a voltage regulator mounted off-board (1.jpg, top image, right hand side - probably feeding 5V to the digital board beside it. There are two separate output channels - red/yellow and blue/green (3.jpg, bottom image...
  12. kellys_eye

    Need help with finding audio input

    Looks like it has only one speaker output as well which means it's a stereo module that has been BRIDGED to increase the output and works/acts as a mono amplifier. Need a close up of both sides of the board to determine where the input(s) are. I can clearly see two pre-amp channels (duplicate...
  13. kellys_eye

    Turntable Repair - Stopped Spinning

    You should check the motor feedback signal from Z601. This may be a hall effect device and its position relative to the motor (pickup distance) is quite critical.
  14. kellys_eye

    What protocol?

    In a serial comms situation there has to be a synchronising pulse and the key to identifying the protocol is identifying where these sync pulses occur. You can then count the pulse BETWEEN the sync pulses and figure out the word length and go from there. Given that most protocols are 'set'...
  15. kellys_eye

    Knife sharpener internal fuse

    Yes, the 'give away' is the crimping..... you can't solder thermal fuses for obvious reasons. Not sure how to figure out which temperature value the numbers refer to though <shrug>
  16. kellys_eye

    Recommend UK calibration service please?

    I don't know of anyone that's cheap.... but I'd ask the question why? It is possible to purchase some pretty accurate voltage reference units that would offer accuracy better than 0.1% which would, for a hobbyist, be more than sufficient. These are based on now very common industrial...
  17. kellys_eye

    Power-One power supply mod

    The published mods (as advised at various intervals throughout this thread) are quite concise and easily made - turning the original 'defective' design into something really quite useful. A new thread dedicated to its construction - start-to-finish - will prove popular. Give the thread the...
  18. kellys_eye

    Getting kids into electronics

    Happy someone has ressurrected this thread.... As a grumpy old git (9 out of 10 cats - who expressed a preference - agree with this figure) I find that many of todays youth have too short an attention span and waiting for a circuit to be developed/built doesn't fit with their 'I want it now'...
  19. kellys_eye

    Power-One power supply mod

    Can't recall the last time I used more than 1A on any circuit I built/tested recently. I repair a lot of marine electronics and TV's and rely on dedicated power supplies for the marine (12V) and the (hopefully working!) PSU in the TV's. I'd have to check to see if my existing variable PSU (max...
  20. kellys_eye

    s-protec on lg soundbar

    .... we need to start a methodical testing process..... testing 'each' of the components is the task of the amateur.
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