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  1. kellys_eye

    Stabilizer for fridge, washing machine and Led TV

    Caused by what? The TV? The fridge? The washing machine? They can't ALL be doing it. What form of circuit protection is fitted? Fuses? Circuit breakers? RCD's? Connect each device and see if the fault occurs on just ONE of them. If it occurs on them all then the WIRING is the problem...
  2. kellys_eye

    Protection for RFID

    Difficult to say. Without a ball park figure for inductance you would be lucky to get a variable capacitor that could cover the required span. In theory, yes. But much easier to do ballpark calculations using the approximate value for L.
  3. kellys_eye

    Stabilizer for fridge, washing machine and Led TV

    Short circuit or tripping of the RCD? I suspect your are getting 'nuicence tripping' which is most commonly caused by defective motor capacitors in refrigerators, loose wiring and/or 'borrowed neutrals' in the distribution unit. Power the items separately and individually to determine which is...
  4. kellys_eye

    Yamaha psr s710 - No Sound no led lights from buttons.

    Check that the processor clock is running properly - the 11.2MHz crystal, X300. Check the supplies and decoupling capacitors on the processor board. Check the connections to the board.
  5. kellys_eye

    INDIA+ POWER GRID

    Perhaps the forum could reject PM's from anyone with less than a specific number of posts?
  6. kellys_eye

    Protection for RFID

    You drawing shows the RFID device being powered from the same AC source as the heater...... it's supposed to get its power from the induced voltage from the RFID reader unit. The 'sender' chip will only require a very small voltage and the AC from the heater supply is likely just blowing the...
  7. kellys_eye

    Component identification

    The reverse is probably the case - the driver IC (switching transistor) was probably overloaded and the excess current caused the transformer to overheat.
  8. kellys_eye

    Mains electricity question...

    I recall seeing some PIR lights that have the ability to come fully 'on' by flicking the mains switch on/off (twice) otherwise they work as ordinary PIR controlled lights. Maybe have a look for the operating instructions of the PIRs you have in mind - they may already have this facility.
  9. kellys_eye

    Smoothing output of a full bridge

    The smoothing capacitor is probably only shown as non-polarised for a theoretical appreciation rather than a practical one. The size of smoothing capacitor is usually defined by the current draw (rule of thumb is 1000μF per amp-drawn) and you won't find capacitors of that size in a...
  10. kellys_eye

    Spike Generation

    the TVS you've fitted still allows pulses of up to 20V to be generated/passed. Worse - it allows pulse of 20V in the WRONG DIRECTION to pass. Use a simple diode across the relay coil.
  11. kellys_eye

    Component identification

    It's a basic common-mode rejection filter. Worst case is you can rewind it by hand (copper wire easily available and a little heat will get the transformer cores separated and off the former). Even worse case is that the transformer burned out for a reason - usually a short-circuit in the...
  12. kellys_eye

    Protection for RFID

    Are you actually powering the RFID chips from AC? They would usually be DC devices and require some regulation to keep within their operating parameters. What is the actual device being used?
  13. kellys_eye

    Help reconnecting/soldering USB port that fell out of place

    This site can host its own images and its far easier for commenters to reference the image easier than via alternative hosts: It's not easy to discern anyway.... but you need to make the socket physically secure before attempting to resolder joints. A good epoxy resin, carefully applied, would...
  14. kellys_eye

    Protection for RFID

    RFID is, by its nature, radiative so how would you determine position from a radiated signal that was 'everywhere'? You would need to switch the RF on - and end up using (maybe) a slot technique to do the switching! Without knowing how the wheel is actually drive I can't comment on alternative...
  15. kellys_eye

    INDIA+ POWER GRID

    Reminds me of our dear old Prince Phillip - that part-time casual racist - who once looked disparagingly at some electrical installation and said: "Looks like it was wired by an Indian......" He must have inside information :D But when it comes to the closed thread - the transformer is only a...
  16. kellys_eye

    Electronics Recycling Marketing

    Recycling is now a well known factor in everyday life - why would additional advertising of this fact make any difference to the system as it stands? If people don't 'directly' recycle their electronics then it is usually 'sub-recycled' at the collection point - else it is considered beyond...
  17. kellys_eye

    Spike Generation

    What about the rest of the circuitry? What is the PSU driving? Have you looked at the data sheet for the regulator and checked the design characteristics and parameters? Why do you need to know these figures? What is your end purpose?
  18. kellys_eye

    How to add audio to a picture frame

    There are many MP3 playback/record modules available... Small and cheap. Google or eBay will show them.
  19. kellys_eye

    Sound cancellation

    Getting it exactly 180o out of phase is desireable but not essential. Desireable because it will 'eliminate' the interfering noise but the idea is 'reduction' which is probably good enough.
  20. kellys_eye

    Spike Generation

    Depends. Are there any switching elements/functions or any inductive components?
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