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  1. kellys_eye

    Dolls house lights on 6ch timer

    Can you provide a link to the original product or site you got it from?
  2. kellys_eye

    Ground Zero amp help!

    You could always disconnect the DC (output) supply lines from the PSU and fit a dummy load - no damage ot the amplifier and vary the load to see what's happening. Might need a 'scope if it is an oscillation problem though. Have a look at the snubber circuits R45/C67 (and the other three under...
  3. kellys_eye

    Arduino Aggregates Eprom Prob

    What is the RTC part number? Commonly they are I2C addressed and return a string with the clock data. There should be a 'sketch' available for your RTC - well, most of the common makes but there are generally only a couple of types in existence - and the sketch will do all the hard work...
  4. kellys_eye

    This might be a fun disscussion :)

    I'd go for the supply being -ve AC as in sub zero-hertz.
  5. kellys_eye

    Ground Zero amp help!

    Any other MOSFETS damaged? Sounds as if the amp is going into oscillation - check the decoupling caps in the PWM circuitry.
  6. kellys_eye

    PwM using microcontroller

    You can't do the measurement and output on the same pin unless you have some form of 'switching' to differential between the two.
  7. kellys_eye

    Need advice on issues with a 40pin 0.5mm pitch FPC cable and its adapter

    You're using copper tape to hold it down - is it shorting across an tracks? Equally, you're pushing the connector strip down where the other solder pads (of different pitch) are situated - no shorts there I presume? Lastly, if you've over-stressed the flat ribbon you may have broken the tracks...
  8. kellys_eye

    Lcd screen controller board overheating?

    What part of the board gets warm? There is the main controller IC and I can spot what looks like a regulator to the side of it. The regulator may get warm to the touch to the point of 'hot' but unless it gets TOO hot to touch then it's probably ok. If you're overly concerned then measure the...
  9. kellys_eye

    The new types of IOT

    "IOT" Internet Of Things - basically the trend to connect 'everything' to the internet - your refrigerator for example (auto updating your shopping list). I'm too long in the tooth to appreciate my 'fridge telling me I'm out of milk - the empty bottle does that for me..... but I can see how...
  10. kellys_eye

    Disable backlight of LCD monitor

    Are you totally sure you can see your monitor without a backlight? I've repaired many laptops that have had backlight failure and the owners have sworn the 'display is dead' as they can't see anything at all! Most laptops/monitors I've seen/used have been able to dim considerably enough to...
  11. kellys_eye

    Rechargeable Power Supply Question

    Cheap Chinese fakes are an issue that affects nearly every area of electronics but if you have the correct approach to your purchases you can avoid the major issues i.e. for safety-critical components, make your purchase through the recognised distributors and utilise both their own QC...
  12. kellys_eye

    Whirlpool control board Ivensys L1373

    I'd be inclined to think that the relay controlling the motor has got dodgy contacts and isn't 'breaking' when the cycle finishes. Run the cycle. When you think the cycle should be slowing/stopping, use the blunt end of a screwdriver to give a sharp tap on the top of the relays sequentially...
  13. kellys_eye

    What trends of Electrical Engineering Market that will make good money in 5 years.

    Bob, when someone comes along and spouts the 'denier' word, hoping to associate my position with those of Nazi atrocities, all I can think of is that they've immediately lost the argument. They compound their position by making claims that scientists are paid by the fossil fuel industry yet...
  14. kellys_eye

    Fender stage 160 amp blowing fuses

    You DO need the zeners - they regulate the supply for the op-amps in the filters and pre-amp circuitry. An MOV will make zero difference to the way the system works and removing the zeners will blow all your ICs to bits..... 5W zeners aren't unusual but if you can't get them locally then the...
  15. kellys_eye

    Low cost (single ended) soldering pins?

    The original veropin (as you picture them) seem rather short for stacking pcb's. Most pcb's are 1.6mm thick and the pin passes through the bottom of the board so you're left with only 6.5mm or so to cram the components on the board since the pin has to pass through the next (stacked) board so...
  16. kellys_eye

    Question

    Nearly all form of transmitted radio waves requires the obtaining of a license before you are allowed to do so - there are , however, certain frequencies and power levels where such requirements are less stringent and even not required but YOU have to make that determination. But just 'making...
  17. kellys_eye

    Difficulty to find components

    The voltage can be anything really - regulators can be used to drop or boost the voltage to what you need. If everything (or the majority of things) works at 12V then it's just common sense to use a 12V battery...... Each part of the system will consume current - the Raspi is stated to consume...
  18. kellys_eye

    Rechargeable Power Supply Question

    Note that some of the modern lithiums actually have the protection circuitry as part of the battery itself - you pay a bit more but what price your safety?
  19. kellys_eye

    What trends of Electrical Engineering Market that will make good money in 5 years.

    Where hydro exists it is usually fully implemented and therefore of limited expansion. Micro hydro systems are becoming popular - again only on the basis of subsidy - but it is, at least, a more reliable system than solar/wind. Right now we don't need expensive renewable systems. We need...
  20. kellys_eye

    What trends of Electrical Engineering Market that will make good money in 5 years.

    You are inferring 'demand side management' and that's a system (issue) being imposed here in the UK - against many concerns for the implications. So-called 'Smart Meters' are being rolled out across the country and there is no doubt that these can be used to control peoples power consumption...
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