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  1. kellys_eye

    Building a circuit [Variac]

    A variac does NOT give isolation from the live mains connections and could well prove fatal. Suggest you obtain a proper isolated primary/secondary transformer as per the schematic. They are not difficult to source. Most hobbyist electronics sites will have them...
  2. kellys_eye

    555 flasher isnt flashing

    Connect the supply -ve to ground
  3. kellys_eye

    4017 IC

    You will need current limiting resistors for the LEDs too.
  4. kellys_eye

    Please excuse total noob query regards seeking storm bad signal effect on sat TV

    I'm sure there will be simulators for such effects somewhere on t'internet. The TV/video fraternity would be the place to look for them. Displaying it on a computer monitor would look no different to that of a standard (these days) TV screen.
  5. kellys_eye

    In need of some Career Guidance!

    Lots of opportunities to progress (even if it is sideways) in the defence industry. Job security counts for a lot too these days. It's not as if war will ever go 'out of fashion'...... Genuine industry is very competitive, often brutal (in terms of results-or-out) and frequently...
  6. kellys_eye

    I have created a Mathematical Construct that will change the way we do maths !

    How do you assume -infinity can even exist? given that '0' can be 'anywhere' on the -infinity to +infinity line? All numbers are positive anyway (multiply any -infinity number by itself)......
  7. kellys_eye

    SONY DTC 690

    Try searching Youtube
  8. kellys_eye

    Hitachi 57F710E rear projection no longer turns on after power failure

    Could also be a simple dry solder joint. You could try poking the PSU boards (with a suitably insulated stick) whilst trying to power on. Flex the boards a bit and see what happens. (Whonoes beat me to it!)
  9. kellys_eye

    Hitachi 57F710E rear projection no longer turns on after power failure

    Sounds typical of swollen capacitors in a PSU section - such intermittency is indicative of it.
  10. kellys_eye

    Harman Kardon 495i

    It's a known problem that (some) capacitors age badly - change value, change internal resistance - so finding such issues isn't unusual. Many restoration techniques involve 're-capping' equipment to guarantee both safety and operational specification but that can be overkill if the issue is...
  11. kellys_eye

    Amp repair around SW Virginia

    In the industry for 40+ years and it's a new one on me...... "serviced and calibrated" however.....
  12. kellys_eye

    Harman Kardon 495i

    Component tolerances in the tonal control circuit? Tolerances in the amplifier bypass components? Problems in the passive speaker filter components? You really need to apply a known signal and monitor the output using the correct test equipment to 'prove' a fault or the best you will end up...
  13. kellys_eye

    Adding RC to a self balancing scooter/hoverboard.

    Using the board the way your seems pointless - as Braeden points out, you could just use a 'tank' or any RC device that moves back and forth/rotates to carry the 'vertical' pole where you wanted it to go. Smooth speed increment/decrement would prevent most camera movement. What I 'think'...
  14. kellys_eye

    Running house LED lights on AC

    The LED versus Filament light argument has been raging for years. The fact is that a filament lamp puts HEAT into your environment that has to be 'replaced' if you use an LED lamp in its place. A few 100 watts is a significant contribution to warmth in any room - ok you might get used to...
  15. kellys_eye

    Inverter Generator won't produce power

    Interesting - I haven't seen the insides of one of those (or my own model) so it's a new sight to me. The coil arrangement reminds me of the direct-drive washing machine motors that people convert to generators. High voltage output does seem to be the kind of result.... I'd be even more...
  16. kellys_eye

    Adding RC to a self balancing scooter/hoverboard.

    Tricking the board will be far easier than the modifications you propose. Use circular 'disks' but only one side actually has the (lead?) weight on it. If the disk is marked the viewer will see how it works but a plain coloured disk will be effectively) invisible in operation if that's what...
  17. kellys_eye

    Inverter Generator won't produce power

    Citation? Most inverter-generators would (I'm led to believe) operate on the usual UPS-inverter method taking a low(ish) DC voltage and inverting it as required. Starting with a high AC volts and 'converting' to a lower AC volts seems counter-productive to me. The simplest (and therefore...
  18. kellys_eye

    Inverter generator

    So what? This is (presumably) the output of a car alternator-type thing? Simple three-phase rectification and you have DC to feed to an inverter. Whether or not that DC is of the appropriate level is questionable (but resolvable too) so in principle you can do what the OP requests. More...
  19. kellys_eye

    Inverter Generator won't produce power

    The 'motor generator' part of the device must have a voltage of some kind coming from it. If that voltage can be converted to something a standard inverter can use then there is no reason why you can't do the substitution as you suggest. Do you know what the motor-generator side actually puts...
  20. kellys_eye

    Adding RC to a self balancing scooter/hoverboard.

    I would imagine using servos to control the position of two weights that rotate freely above the platform would simulate the weight of a person and the position they place themselves in would allow control of the board..... This is simple two-channel control. Two joysticks with simple...
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