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  1. kellys_eye

    Acer X223W LCD Monitor

    What about the video cable?
  2. kellys_eye

    Help Yamaha psr e343 won't stay on

    We need to see more of the instrument - clear, in-focus images of the electronics. Is the power button 'mechanical' or 'soft'? for example? How are you powering it? Batteries or power pack? Is the battery/power pack ok?
  3. kellys_eye

    Too much current with 5v, how to handle or resize?!

    The cable you link to is serially programmable for total individual-pixel colour control which is fine if your lighting requirement extends to multi-phasic alternating patterns! If all you want is fixed, colour-changing lighting then even the likes of Ikea do such - or you can fit the Phillips...
  4. kellys_eye

    Help selecting my 1st DSO please.

    Agree - that Mooshi looks nice. Got me thinking too.......
  5. kellys_eye

    Too much current with 5v, how to handle or resize?!

    The current consumption assumes worst case (RGB all driven 100%) and I don't think the driver chip is capable of dissipating that kind of power anyway..... so some attention to HOW you're driving them will make considerable differences to the power consumption. You can also power them from both...
  6. kellys_eye

    Where to find scrap electronics?

    Got a local face(palm)book page or chatroom etc? Putting out a request for 'dud electronics' may get you more than you can cope with! Word your request politely, NEVER fail to turn up if you say you're going to and acknowledge all replies - even if it's to refuse their generosity.
  7. kellys_eye

    Mobility scooter power module won't charge

    The diode is likely only required to stop the batteries back-feeding the charger and since the charger output is rated at 1.5A a 3A diode (100% over-rated) should suffice but there's nothing lost by fitting a higher rated one. The charger is defo dud then! Ideally you should use two matched...
  8. kellys_eye

    3 switched earth's to a decoder to produce 6 earth outputs

    5V if you use 74-series logic or 6V to 12V (or thereabouts) if you use the 4000-series CMOS. It's usual (but not definitive) to use pull up resistors and ground the inputs if you are using switches as the input device. If you are driving the inputs from other devices you can omit pull ups and...
  9. kellys_eye

    Why the crazy price for a decade resistor/resistance box?

    Testify.... Goes with the adage that the stuff you sell will be sold for pennies - until you see someone selling one a week later that gets £££'s for the same item. Grrrr...... Yay internet.......
  10. kellys_eye

    Help fixing TV Panasonic TX-P42UT30E

    Spot on with the tech spec. The two-pin version should be fine unless you're in the habit of bouncing the TV around a lot.... but ideally a like-for-like substitution is always the best option. Thing is, that resistor was put there to protect things so you have to ask the question, what may...
  11. kellys_eye

    Help fixing TV Panasonic TX-P42UT30E

    It's a 142 degrees C thermal protected resistor. IIRC the 'top' pin is just to assist in physical location on a circuit board and the resistance is measured between the two adjacent pins. If it measures open-circuit you need another one. The three-pin connection arrangement can be confirmed...
  12. kellys_eye

    Why the crazy price for a decade resistor/resistance box?

    I thought tolerances weren't 'divisible' that way i.e. if you want a 0.1% tolerance decade box all you need are 0.1% tolerance resistors across the range.
  13. kellys_eye

    Why the crazy price for a decade resistor/resistance box?

    Relatively high wattage, high stability and close tolerance resistors aren't 'cheap' - which is what you (ideally) want for a decade resistance box. Add to that a set of decent multi-position rotary switches (have you seen the quality of some of the better ones :eek:) and slap it all in a...
  14. kellys_eye

    Mobility scooter power module won't charge

    say what???? Can you double check that and/or show a pic of the charger itself? The diode (which, from your information, does seem open) is a simple rectifier and anything rated at 100V (or upwards) and 3A (or upwards) will suffice - a typical diode would be 1N5402 [03, 04, 05, 06]. Clearly...
  15. kellys_eye

    What do I need?

    You need knowledge. Without an understanding of the basics of electronics you will be forever relying on others to do the job YOU want to do. Spend your evenings reading the basics of electronics, fault finding and test equipment use. There are many, many good books available (and downloads)...
  16. kellys_eye

    Read and copy PIC12F program memory

    Do you know if code protection has been applied? This is common for commercially produced devices and 'variable' for amateur use. If so, forget it.
  17. kellys_eye

    Where To Start ..?

    Only two real areas to look at - the controlling switch (to discharge the capacitors) and the capacitors themselves. In my experience (of electric fence energisers), systems that rely on heavy discharge of capacitors to provide a pulse invariably suffer capacitor failure/degradation...
  18. kellys_eye

    Automatic greenhouse window opener

    Maybe something simple like a servo-actuated cam, the servo position being set by a PWM circuit that has a thermistor as part of its timing circuit perhaps? Many RC model servos have sufficient power to turn a decent sized cam that could be used to 'lever' a window open. Such servos are driven...
  19. kellys_eye

    Help selecting my 1st DSO please.

    Seriously.... it's not an easy choice. It's often difficult to assess unless you know 'where you are' and 'where you're going' with your electronics. Some will argue (and count me as 'some) that ANY scope will do for the beginner as there's a lot to learn before getting to grips with what a...
  20. kellys_eye

    Brain storming layout for safety lighting circuit. Help.

    Sledgehammer and walnut eh.... lol. If you can be more specific about the switching arrangement we may be able to suggest a simpler solution but if this is an exercise to develop programming skills then, hell yeah.... why not? As above - it's fairly straightforward to drop the supply to the...
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