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  1. kellys_eye

    Can I fix this old Pioneer SR303 Reverb myself?

    I have the service manual - it has everything in it that you could need to repair it - except the 'skills' of course. But we can help with that side :p Problem - the file is nearly 10Mb and I can't upload it here. You can sign up at hifiengine (free) and download it yourself though...
  2. kellys_eye

    Can I fix this old Pioneer SR303 Reverb myself?

    Don't see why not - it's not a very complicated device. Schematic below: Start by checking and cleaning the switches.
  3. kellys_eye

    Sony Trinitron screen discoloration

    Check the degaussing circuitry first.
  4. kellys_eye

    Cheap linear actuators

    Is that where cupboards meet in a corner? If you need to make something with significantly greater 'pulling power' then my motor offer remains! Just found some spare gearbox parts for them too so you could have 20:1, 60:1, 200:1 or 500:1 reduction! Imagine a shelf that dropped down a special...
  5. kellys_eye

    Cheap linear actuators

    Like your internet history perhaps?
  6. kellys_eye

    Airwick Freshmatic Max unit

    Have a look at this:
  7. kellys_eye

    12v automotive relay how do you find amp rating ?

    Usually you just Google the query and get the data sheet for the relay (or the range of relays) where all those details are listed.
  8. kellys_eye

    Energy from the air

    Quit simply, the levels of energy induced into the 'plate' will be of the order MICRO watts - in theory you can charge a battery this way but in practise you'd die of old age before it happened.
  9. kellys_eye

    1980 Soviet Radio Cassette amplifier problem.

    Check the values of R31/R32. If they have changed value (R31 high or R32 low) they can increase the gain and introduce distortion.
  10. kellys_eye

    Problems with using LM324 as an inverting amplifier

    You can't invert the output without having a split-rail power supply.
  11. kellys_eye

    Arduino UNO + 2.8 tft white screen

    Libraries are device-specific and simply swapping different size screens can stop them working due to individual register differences. If your screen isn't EXACTLY the same as the one the program is addressing then you'll have to check for those 'differences' and make the relevant adjustments.
  12. kellys_eye

    1980 Soviet Radio Cassette amplifier problem.

    This. Many such output stages use matched pairs of transistors. One of them out of spec will cause the issues described.
  13. kellys_eye

    Solar to battery to tv, fan etc

    Not really - a common misconception. Where we live we're close to the coast where the warm Atlantic currents keep the local environment a lot warmer than you'd expect. There are some gardens in the area that have palm trees and other exotica! Our biggest issue is the damp atmosphere - we've...
  14. kellys_eye

    Arduino UNO + 2.8 tft white screen

    Is your wiring correct?
  15. kellys_eye

    Solar to battery to tv, fan etc

    Mobile/portable? A system the size you describe isn't what I'd call portable!!! Whatever inverter/generator you get the power output will depend entirely on the load, not the generator output itself and having a decent margin for output (say +50%) is always a good idea. 4.8kVA seems a bit...
  16. kellys_eye

    Square wave signal with ADC converter

    If the squarewave has a 50% duty ratio then simple smoothing should result in HALF the signal amplitude i.e. your 5V signal will give a 2.5V output therefore a x2 buffer will give the 'real' voltage. If the duty cycle is variable you have a few more issue to resolve. There are some dedicated...
  17. kellys_eye

    1980 Soviet Radio Cassette amplifier problem.

    Have you checked the supply voltage at the higher levels? Are there any larger capacitors in the PSU section that you haven't changed yet?
  18. kellys_eye

    Solar to battery to tv, fan etc

    A 300W panel - assuming working to its full capacity and is a 12V panel - will deliver 25A to the battery and it would take the battery around 6 hours to charge fully, delivering 150Ahr to the batteries (more than they can hold....) over that period. Running the TV and fan for 16 hours will...
  19. kellys_eye

    Use an ignition coil to charge an electric fence.

    Me too! That's why I posted that schematic (post #5) - it works too.
  20. kellys_eye

    Reduce off grid freezer startup current?

    I'm not even sure the method actually works either. I can see how they might be able to reduce the start-up surge (which, to me, is the most important issue) but as far as 'energy saving' is concerned any messing with the compressor simply means it doesn't work as efficiently as it should and...
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