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  1. kellys_eye

    Proper thermal pad/compound for DVR chip

    Yes - although the pad system is a lot more forgiving for pressure stress. Get the heatsink fitting 'off-level' and you risk chipping the chip.....
  2. kellys_eye

    6kw solar design from used equipment design.

    seconded
  3. kellys_eye

    rac model 8040 parts info

    Electronics Point - need more information.
  4. kellys_eye

    Help, what is it? (From a vintage 16mm film projector)

    Looks like a 100kΩ resistor to me.... could also be a capacitor....others may think differently? Either way, if it is what I think it is then a 2W 100k Resistor or a 0.1μF capacitor (250V) modern equivalent will replace it. If you have a test meter you should be able to measure the...
  5. kellys_eye

    PlayStation2 clock is dead, but battery is still good

    Is there a shorting link to reset the BIOS? This is normally placed in one (certain) position to reset a BIOS (for eliminating password protection etc) and should be replaced to its 'neutral' position afterwards. If it was left in the 'wipe' position it might cause this effect.....
  6. kellys_eye

    Crystal 16000.0

    It's physical size is known as UM-5 but that sized won't be easy to obtain. I'd say it's a 16MHz device (too small for 16kHz) and the HC-49U will probably fit although you really need to know if it is a fundamental, overtone, series, parallel etc. Do you have details of the circuit it came...
  7. kellys_eye

    PlayStation2 clock is dead, but battery is still good

    Silly question - is the battery in the right way up? You should be able to change the time setting regardless of whether the battery is in and/or charged/discharged. Points to potential issues with the BIOS. If you can change the time but it doesn't remember it when you switch on/off then...
  8. kellys_eye

    mpf102 duds

    Difficult to say - there are some valid reasons to believe that the 'fake component' rumours are true but unless you test each and every device that comes in BEFORE using it you will never really know. I take in loads of parts over the course of a year and never do any tests - I could be...
  9. kellys_eye

    Door Entry Phone

    Sending the PAL/NTSC composite video over twisted pairs may work but this will require a pair that runs to each destination. A lot depends on how the original system worked - are there separate cores in the cable for each flat? How many cores per flat? What form of control do you need to...
  10. kellys_eye

    A dedicated chess computer, Mephisto Munchen Lyon

    Tried replacing the battery?
  11. kellys_eye

    RF enabled motor controller

    Depends. The 'decoder' part will have some form of output that is used to physically/electrically enable 'whatever' OR it may be in software that allows the controlling program to run. If it is a 'physical' signal then yes, you can bypass it. I suspect it will be a software issue though and...
  12. kellys_eye

    RF enabled motor controller

    Was there a problem with the answers you were given before? Or are you hoping for a different answer?
  13. kellys_eye

    Door Entry Phone

    Assuming the cabling can carry a video signal are you talking baseband video or RF video? If baseband video then you may need a video splitter/amplifier to drive each line but not an amplifier per flat. What, precisely, is the cable being used? Multi-pair (twisted)? Coaxial? A wi-fi...
  14. kellys_eye

    Looking for some assistance with a 555 one shot controller?

    I presume you connect your LED via the relay contacts - if so then use the (c) common and the (nc) normally-closed contacts. Supply power to (c) from the feed to the timer and power the LED from the (nc) terminal to ground via a current limiting resistor.
  15. kellys_eye

    Just an idea - maybe it already exists?

    Much of the data base would be copied/pasted from existing - Excel offers all the search facilities such a project requires as would a standard Database-type software (but I'm more familiar with Excel). It's not my 'thang' but maybe robot software could trawl sites for such data and compile a...
  16. kellys_eye

    Naze32 flight controller Repair

    I'm puzzled as to how the diode can blow if the supply line is shorted???? Reversed... yes, that's a very likely outcome but 'shorted'? Shorting the power line would only cause the PSU to have issues. Either way if removing the diode (if it is a parallel-protect device) and/or shorting it...
  17. kellys_eye

    Switching a RF signal

    I've looked at some of the data sheets for the solid state devices - many (most) are 5mm2 and have 0.5mm pin pitch :eek:..... these would require special(ist) pcb manufacture/design and/or mounting/servicing tools. Whilst I don't object to using them (horses for courses) I did specify the KISS...
  18. kellys_eye

    Just an idea - maybe it already exists?

    I was contemplating designing a parametric search program to help identify semiconductors but wondered if anyone knew of something 'out there' that already did what I envisage? The idea is to use drop down menus to select #pins, package type (from images), manufacturers symbols (from images)...
  19. kellys_eye

    PWM LED DImmer

    The LDD device won't dim with 'just' a potentiometer. You need a pulse signal (variable) to do the dimming. Your original choice device would be the one you need. Change the potentiometer for one with an integral on-off switch and wire the supply to the LED control module through the switch...
  20. kellys_eye

    Questions about chargers & charging a 2kWh section of a Chevrolet Volt battery

    Bit cheeky of them - I'd be asking for a discount/refund for doing what THEY should be doing..... Anyway, you can snip out the green NTC. You need to solder two links as they indicate and yes, the wire needs to be 17AWG or greater (which actually means a LOWER number i.e. 16, 14 or 12 etc)...
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