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  1. kellys_eye

    Schematic diagram of edifier x600

    It's an amplifier - hardly 'complicated'. What's the problem with it?
  2. kellys_eye

    Lead-acid vehicle battery discharge time

    The manufacturers will have details of self-discharge, discharge capability/temperature etc.
  3. kellys_eye

    Remote observatory power... amperage reading is not what I expected

    Bridges are unnecessary. Simple blocking diodes from supply positive (A+B) to the DC-DC converter input will do - and 'common' the negatives.
  4. kellys_eye

    DT9205A multimeter is not switching on after measuring the DC voltage. Can any one help me?

    The DT9205 is not a suitable meter for measuring ANYTHING over 300V, let alone 1000V!!! I'd be worried doing even 300V on that type of meter. The reviews on it are 'fake' - done by those that don't know what they're talking about. If you want to SAFELY measure 300V and upwards then get a...
  5. kellys_eye

    30W LED amplifier from 12V

    The 'amplifier' you want is another 'driver'.
  6. kellys_eye

    Multi Band AM/FM/SW Radio became only FM radio after over voltage supply

    Is this the insides?
  7. kellys_eye

    For Sale: Want to sell vintage Realistic STA-90 receiver

    Good condition examples MIGHT get £100-£150. You'll only ever get what someone is willing to pay and with a missing knob the value drops considerably - much less than half that mentioned.... £30 maybe. Have a look at the UK Vintage Radio forum and ask there - some very knowledgeable people...
  8. kellys_eye

    Led from Mercedes headlight

    ^ :D You could check in the car itself and see which wires have power on them when you turn the lights on.
  9. kellys_eye

    Looking for an underwater ranging device

    Tie the camera to the swimmer.
  10. kellys_eye

    Astronomy idea(s)

    Most recliners I've seen (or taken apart) only have basic mechanisms - the actual seat design I need requires reclining to (as good as) the horizontal. The rotational part isn't difficult to achieve as the seat would be built on a simple flat, rotating, platform.
  11. kellys_eye

    LED dimming module

    The active device is this: http://cds.linear.com/docs/en/datasheet/1002fb.pdf but if that's a Chinese-origin board you'll find it's cheaper to buy a new board than get the chip!
  12. kellys_eye

    Retail product that can supply 120V/30A from battery?

    A 3600W inverter would 'just' do the job - with losses etc you'd be looking at a 5kW device(?) perhaps. And at even 3600W they often use 24V or 48V - 300A cabling to an inverter is problematic. Cheapest and easiest way is to get a gas generator.
  13. kellys_eye

    Is it possible to fix old PC monitor

    I'd power it up and try to explain any ACTUAL fault you have. A set of pictures tells us little/nothing. Is there an actual fault symptom - have you taken any voltage measurements around the board? The missing trace is an 'obvious' area for concern but, once repaired, may just lead to other...
  14. kellys_eye

    i need to find those variable capacitor

    If you are having trouble finding the 140+60pF variable then get a 2-gang 140pF and remove some of the plates from one of the gangs. This will reduce the capacitance proportionally. i.e. remove HALF of the plates from one gang and it will reduce to around 70pF - near enough for your needs.
  15. kellys_eye

    Need help with microwave transfo.

    What you think is 'three phase' actually isn't. It will be a low voltage centre-tapped voltage applied to the INVERTER board. It's the inverter board that converts this LOW voltage to the high voltage for the microwave function. Sadly (for you), using this high voltage output from the...
  16. kellys_eye

    i need to find those variable capacitor

    What country? You should be able to find suppliers of HAM RADIO parts or even find a group of hobbyists that could supply them from their 'scrap' boxes. Ebay is also a good source for them. Such parts are still available new (old stock in some cases) but they aren't cheap...
  17. kellys_eye

    Astronomy idea(s)

    Yeah, it's often cold here and even more often damp BUT when the clouds roll back and the weather is calm the night skies where I live are stupendous - full MW visibility within minutes of stepping outdoors - no street lighting, no neighbor lights, no town lights - a true 'dark sky' phenomena...
  18. kellys_eye

    Carnival Game Control Board

    What does it actually do? If you can derive a flowchart of what the unit actually does you can quite easily replicate it without recourse to lengthy reverse-engineering principles. You may even find you can achieve the end result via a much smaller, much more efficient, fully solid-state...
  19. kellys_eye

    Astronomy idea(s)

    Here's a 'wacky' angle: Use two hi-res Android tablets (1920x1080) and arrange as a binocular-like shape. Use a digital camera to allow recording of the 360 degree LOCAL environment to develop the 'horizon' to be overlaid onto any star map that can be generated and displayed on the tablets...
  20. kellys_eye

    Astronomy idea(s)

    Guided mounts - got one. Think more along the Dobsonian drive mechanism rather than the polar-aligned version (equatorial). Given the low(ish) drive accuracy required for wide field binoculars (low magnification) then the X-Y axis drive for any bino chair is pretty simple to implement. The...
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