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  1. kellys_eye

    How can I test a xlr charging port

    It's always nice to know the result of advice - good or bad! Good luck.
  2. kellys_eye

    RS Analogue Multimeter AMM301

    The higher resistance ranges use the 9V battery. Change it.
  3. kellys_eye

    Tone for thought..

    I seriously doubt your scope displays are telling you anything useful. You don't help your cause by stating: which only indicates that you have no clear understanding of how a scope works or what you should use it for. A tone control circuit shouldn't 'distort' the signal - it should...
  4. kellys_eye

    How can I test a xlr charging port

    Sad that no one is prepared to even have a look at it. Anyway, if there is a fault in the electronics then you're pretty much stuck (if no one will look at it) but in my experience it is the 'mechanical' parts that fail first and, in this case, the only mechanical part on that circuit board is...
  5. kellys_eye

    Panasonic SA-PT670 CD player and surround sound

    You have an unrivalled access to schematics Edd!
  6. kellys_eye

    Need help with Power Transistor ID.

    8751 and 9110 are probably date codes (manufacture). 1987 and 1991 respectively.
  7. kellys_eye

    What polarity is this?

    Otherwise known as a 'Geordie' (or Redneck) spanner.... I have a box full of them!
  8. kellys_eye

    Happy new year

    Happiness, wealth peace and good health - oh, and 'keep a hot iron' for 2018!
  9. kellys_eye

    Panasonic SA-PT670 CD player and surround sound

    Usually a power supply problem - these are inevitably SMPS (switched mode) in modern equipment so you'll have to get access to it and post images of the circuit board (top and bottom).
  10. kellys_eye

    How to connect wires to prongs on switches?

    The spade connector comes in two main sizes, 1/4" and 'mini' (3.7mm shown below) so check before ordering.
  11. kellys_eye

    5 inch display pcb pinout ?

    I'd put those pins down to being a JTAG, serial or similar programming port given the track wiring directly to the main processor.
  12. kellys_eye

    What polarity is this?

    It is usually only equipment that has a battery pack with optional DC power adapter that have a centre-negative socket (EEVBlog did a bit about this). Of course this is no guarantee and it should be a relatively simple matter to dismantle the equipment to discover the truth/
  13. kellys_eye

    Need help with Power Transistor ID.

    Amplifier make/model? Schematic? Pictures? Our collective crystal balls are broken......
  14. kellys_eye

    Beginner circuit problem

    Have you got a series current limiting resistor in the diode circuit? Sure you have the IC orientated in the right way? Show us your actual circuit layout/wiring.
  15. kellys_eye

    5 inch display pcb pinout ?

    I take it you're referring to the top left of the picture? Do you have any other parts from the original monitor? What was the original input signal source? Where did it connect? If it had a composite video signal input port then simply connect your video signal there - it won't accept a USB...
  16. kellys_eye

    Ferguson 3T18 boombox (no audio)

    Can you find an audio source to actually apply to the AUX input? Many MP3 players have an audio-out socket (3.5mm stereo jack) that could provide such a signal - nothing quite like using the right input after all.... It does still sound as if the audio amp has blown for some reason or other...
  17. kellys_eye

    AT28C64B-20PC doesn't write

    The accuracy of the timing delay seems pretty suspect - do you know what the accuracy really is?
  18. kellys_eye

    Ferguson 3T18 boombox (no audio)

    Yes, these test I refer to are just 'get the basics out of the way' test and your idea to use the AUX input should achieve (almost) the same result. It does sound as if the fault is more involved though but, hey, all the simplest checks have to be done first anyway!
  19. kellys_eye

    High-end drones

    I was gifted one from Santa LAST year and its only been out the box once! It flies via mobile phone or visually and has a camera that records HD onto SD card plus stills. The only flying features it has that helps the pilot is auto altitude and emergency landing. I wouldn't call it 'high end'...
  20. kellys_eye

    Ferguson 3T18 boombox (no audio)

    Not between the contacts - actually touch the contacts. The 'wiper' contact should, if you hold a bare piece of wire against it, induce a loud hum to the amplifier. Try all the contacts - some will be 'earth' and some will be the 'wrong end' but one of them will make it hum.
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