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  1. kellys_eye

    Solenoid proportional valve problem

    The 'curve' is otherwise known as an elbow joint. The only potential reason for stopped flow would be the restriction that elbow offers but that is practically zero for all intent and purpose. You've done something else - switched the power off perhaps?
  2. kellys_eye

    433MHz door bell - Tx antenna feed

    The receiver batteries? Wouldn't the 'fault' be with the receiver part then, rather than the push-button (transmitter)?
  3. kellys_eye

    Help with inverter generator

    Defo sounds like a defect then. The only true way to test would be to use an oscilloscope to monitor the output waveform for stability and purity - probably beyond most people's normal acquisition - so I'd be looking to instigate the warranty.
  4. kellys_eye

    Identifying a chip

    Standard disclaimer. Having said that the whole process to make an interface that passed all the regulations and safety legislation would probably make it beyond economic repair. Sadly, it's a fault situation that may well be recoverable by someone properly equipped with the appropriate test...
  5. kellys_eye

    Help with inverter generator

    That looks pretty 'responsible' and is likely to be as good a sine wave as you'll get from such a portable unit. Try using the charger with an additional load connected (say a 100W lamp) to ensure the output voltage is getting proper regulation. The (extremely) small load of a simple phone...
  6. kellys_eye

    Choosing a complementary transistors pair for a class B amplifier

    Go to any major component suppliers website and use their parametric search facilities to make your choice and get the devices listed in order of price.
  7. kellys_eye

    Garmin gps 60cx gpsmap

    You need an electrical connection to 'probe' and use a continuity tester to find where that trace leads to/from - try cleaning the area around the pad labelled 'onkey' and looking for any copper to take a test point from. Without one you simply can't guess. The most obvious solution would be...
  8. kellys_eye

    Help with inverter generator

    Make/model? We can't guess. Many claims for sine wave output are really 'modified sine wave' - it's cheating really. If the device states TRUE sine wave output you would need to prove this using an oscilloscope or just return it under warranty as not fit for purpose.
  9. kellys_eye

    2CH Relay Motor Control - Wiring help

    Show the wiring (diagram) of the junction box.
  10. kellys_eye

    Help on this transformer (make work)

    Actually it IS a 'sort of' auto transformer in that many UPS devices regulate the input/output throughput voltage by switching in primary winding taps to boost or cut the output within a narrow range. Outside those controllable ranges the system switches to full UPS mode (battery derived AC...
  11. kellys_eye

    Nichrome wire help

    Hmmm, the list I Googled shows 0.4mm to be 16 gauge..... and 0.4Ω/foot. D'ho.... my bad (maths) that thought 0.4mm was 0.05in........ :rolleyes: sorry.
  12. kellys_eye

    Garmin gps 60cx gpsmap

    They could be 'filled vias' (given that I can't see any other actual thru-holes on the board) in which case you're stuffed. I can't see any traces to/from that isolated pad - as was - so must assume that it was a filled via and that the trace has been irreparably destroyed..... It's more than...
  13. kellys_eye

    Nichrome wire help

    Is the battery fully charged? Far from 'glowing' it should have turned bright white and burned out..... it's about 0.2Ω per foot so 50cm is under 2 feet therefore maximum 0.4Ω at 12V should flow 30A and dissipate 360W!!!
  14. kellys_eye

    B&O Beogram 1900 bad motor?

    Trace out the wiring as YOU have done it and derive a wiring schematic from it that we can look at. The photo's you show don't have enough information - i.e. can;t see the wires to the motor coils, can't see the contact arrangement under the white block etc.
  15. kellys_eye

    Creativity project

    The key answer to this will be more mechanical than electronic. Timers are easy-peasy and available off-the-shelf. Not sure if we can offer anything constructive that isn't already encompassed by what's out there on the market.
  16. kellys_eye

    Wanted: Power source

    You're specs are well within what an audio oscillator and amplifier can deliver. Nothing 'special' at all.
  17. kellys_eye

    Garmin gps 60cx gpsmap

    If the (missing) pad isn't part of a thru' hole then it won't be connected to any interlayers of the pcb - which is a good thing. What you don't show is the reverse of the board - we need to see a CLEAR and IN FOCUS image of the area around the damaged board and on both sides.
  18. kellys_eye

    Arduino Camera VGA Display on LCD?

    I haven't got a clue but my mate Google seems keen enough to assist..... http://www.instructables.com/id/How-to-use-OV7670-Camera-Module-with-Arduino/
  19. kellys_eye

    Radio Control Transmitter Help

    Consider purchasing a simple non-working amp and doing a 'restoration' on it. If it comes 'complete' then fault-finding should be easy (most have readily accessible schematics and parts are still available off-the-shelf). Purchasing the individual parts is more than often a lot more expensive...
  20. kellys_eye

    Can these two instruments test the transistors on my printer PSU?

    You can make static test of transistors in-circuit but need to account for the other components that may be connected to it - this takes experience. You can make active tests (powered-up) of transistors in-circuit but this assumes a knowledge of the circuit operation and/or availability of the...
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