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  1. kellys_eye

    SONY Treble button issue

    Anyone's guess. If it is genuinely creating a 'sleep function' action then you need to follow the button tracks until you get the area where the keyboard (button) matrix is being read by the processor and determine if there is a fault on the control lines. Check the operation of ALL buttons...
  2. kellys_eye

    Hello,, can someone identify components in a Gallagher M4000 ?

    A device that conducts when high voltage is applied is usually a 'spark gap' and those parts don't look like any I've ever seen. If they are meant to bleed static voltages to ground then they could be very high resistance resistors (10MΩ or higher) but that doesn't mean they can't suffer from...
  3. kellys_eye

    LFO LED indicators

    precisely. The motor will run at a speed determined by the light level falling on the LDR (as I'm sure you're aware) and one LED will light from '+' down to '0' and the other LED will light from '0' down to '-' (depending on the polarity of the output). What you won't get (not sure if you're...
  4. kellys_eye

    LFO LED indicators

    On the KISS basis there's nothing wrong with they way you show the motor drive - if you want to use 'ordinary' LEDs than any two connected back-to-back will work. Fit them into a tube with the LDR at one end.
  5. kellys_eye

    LFO LED indicators

    Why bother. Use a red/green two-pin LED that will light on both cycles, red for positive, green for negative (or vice versa if you reverse it).
  6. kellys_eye

    Pcb not working?

    have you got a bigger picture of the whole board? The pinout of the SNES cartridge (which is what I assume we're looking at?) doesn't have any corresponding connection details that might indicate HOW the fault occurred. I might have expected a 'fault' on the power lines for one reason or...
  7. kellys_eye

    Hello,, can someone identify components in a Gallagher M4000 ?

    You can see the smaller blue capacitors across the glass bead diodes that form the capacitive multiplier. I'd agree that one of those 'resistors?' is looking a bit stressed though.
  8. kellys_eye

    Hello,, can someone identify components in a Gallagher M4000 ?

    Potentially high value, high voltage bleed resistors. I have a load of boards with similar devices and, when measured, were found to be just resistors.....
  9. kellys_eye

    Low end, how to work with flicker LEDs on 1.5v

    The 'flicker' LEDs have a built in chip to do the flickering. It's supposed to be (anecdotally) a sound generating chip that's playing 'happy birthday' - see if you can follow the sequence whilst watching the light! If you run the LEDs at the wrong voltage you can destroy the controllers - and...
  10. kellys_eye

    Please can I have some help with a boost/buck convertor?

    Yes, but it's easy to misread the coding on those presets - just double-checking.
  11. kellys_eye

    Where can I find these components other than china?? FETS and DC-DC IC's etc.

    Those are all manufacturers in-house numbers - they won't be recognised by any 'domestic' supplier listing and I don't know where to get a cross-reference for them (if such exists). I still find that your assumption that there is something wrong with the ECU to be suspect - they are usually...
  12. kellys_eye

    Please can I have some help with a boost/buck convertor?

    Are you using the correct VALUE pots?
  13. kellys_eye

    Help to identify this stepper motor

    My bad - hence post removal! Sorry.
  14. kellys_eye

    Please can I have some help with a boost/buck convertor?

    The pin connection on the blue multi-turn potentiometer is NOT the same as that of the board mounted preset. The 'tapped' connection is usually the centre pin on the board mounted preset but is usually the BOTTOM (nearest the base) of the multi-turn potentiometer. Show us exactly how you...
  15. kellys_eye

    What uses the Toshiba TFD40W11-B?

    Chuck it in the bin. The 'same connector' is a meaningless statement as the actual pinout arrangement could be, literally, anything. Have you found a data sheet for the panel? This would be the only realistic means of using the display for anything. But given that you can get full colour LCD...
  16. kellys_eye

    Electronic starter kit

    Sounds like the kit is to be used with a USB-sourced supply i.e. 5V. If the USB lead has a power plug on the end of it and there is a corresponding socket that plugs into a prototype board then this is the most likely answer.
  17. kellys_eye

    Device to measure total run time of an electronic instrument

    Not an easy answer. You need to connect to somewhere in the system where the power is actually 'used' - simply measuring when it is 'on' isn't an indication of it actually working. You can get watt-hour meters that will measure the total power consumed over a period of time and if you have an...
  18. kellys_eye

    Trying to figure out the MC34063A buck converter

    fmin is the minimum frequency at which the switching happens and is a compromise between efficiency and inductor design - higher power levels require greater cross-sectional area wire on the inductor which itself limits (potentially) the number of turns you can get on a given ferrite core...
  19. kellys_eye

    Trying to figure out the MC34063A buck converter

    Plenty of design tools out there if you Google them. Plug in your requirements, out comes the component values! Here's one example..... http://www.nomad.ee/micros/mc34063a/
  20. kellys_eye

    Troubleshooting Obsolete Snap-On Motherboard (unidentifiable IC's)

    Other than changing the electrolytics as a bog-standard 'old equipment fix procedure' you might be onto a losing streak if the main control IC is dud. Manufacturer specific etc and the sanding of IC's to remove identification is a nasty - but sometimes effective - way of telling you to 'eff...
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