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  1. kellys_eye

    DIY wire insulation/enamelling

    Where high voltage insulation is required it is common to wind the wire in insulated layers to keep the adjacent potential difference to a minimum. There are many instances of coils operating at 500-1000V that don't require any special coating other than commercially available stuff. Main...
  2. kellys_eye

    ptc thermistor

    Well, bang goes my attempt at helping...... You seem quite capable (?) of figuring it out for yourself - carry on.
  3. kellys_eye

    Ademco 10se Panel

    Ask the previous owners. Surely this should have been noted in any hand-over documents? You must appreciate that we have to be cautious with such requests given the nature of what it is you're trying to do?
  4. kellys_eye

    In need of help with buzzer and LED light

    I did a similar thing many years ago using the old 'loop around a wire' game - I built a variable delay into the circuit such the user could set what was 'sensitivity' into it and thereby allow youngsters with unsteady hands the chance to compete against adults by giving them some 'leeway'. The...
  5. kellys_eye

    ptc thermistor

    What you do is your business but messing around with charging processes can be either passive (simply doesn't work) or 'active' (where the battery explodes in a spectacular fashion) which is why most chargers - certainly for modern chemistry batteries - are made with some form of 'intelligence'...
  6. kellys_eye

    Denon S-301 Malfunction

    Testing the supplies is the usual first point of 'attack' and, in the history of potential fault symptoms, dried electrolytic capacitors in the power section are a good place to point at suspects. Post some clear, close-up pictures of the power supply section. You can sometimes 'see' the...
  7. kellys_eye

    IRig UA schematic

    If the audio is applied to the microphone input of an Android device then the schematic you post should achieve the same results - always assuming the software accepts the 'mic' input as the sampling source. I don't know if there are differences between the sleeve connections on the jack plug...
  8. kellys_eye

    What should I get for beginning electronics?

    Agree with @Wayne Phillips - electronics is always advancing, new concepts, new ideas etc and it's a constant state of catch-up for most in the field. If you have a particular fancy (audio, radio, test/measurement etc etc) you could FOCUS on that and specialise to some extent as being...
  9. kellys_eye

    Beginning electronics, understanding whats actually happening

    If you want to design your own circuits then you need to know and understands the FUNDAMENTALS of electricity and electronics, for which I can highly recommend the 'Horowitz' book. https://www.amazon.co.uk/Art-Electronics-Paul-Horowitz/dp/0521370957 Expensive? Yes. But probably the ONLY book...
  10. kellys_eye

    Dumbwaiter Logic Circuit

    Doesn't this introduce unnecessary complication? Surely a simple 'call' button for each floor would be sufficient given there 'must' be someone at the relevant floor to take receipt of the goods? On a normal dumb waiter this is the case with the hatch being the interlock. In this case you'd...
  11. kellys_eye

    Power Train PTG 6500 Spark Plugs

    Seen that before but it's always a laugh...:D
  12. kellys_eye

    Trans hum

    Yes - the danger is from destroying the power supply. As mentioned they don't work very well, or for very long, when using a dimmer on the input side. You will stress the circuitry beyond its limits as it constantly tries to compensate for you lowering the input voltage. By their very design...
  13. kellys_eye

    Kam amp repair

    I agree with helping newbies and showing them the pitfalls as well as the satisfaction of fixing something. My own policy is to always 'have a go' - but then, I'm not constrained by financial needs so my time is (effectively) free which is something legit businesses can't discount and makes for...
  14. kellys_eye

    Kam amp repair

    I take it you're familiar with the standard repair/fault location methods for audio output stages? If so then the repair could be done in a couple of hours (maybe even 3) at whatever rate you charge but if your skills are lacking then a second hand unit may be useful for 'board swapping' -...
  15. kellys_eye

    Kam amp repair

    If this is a 'commercial repair' might I suggest it being beyond economic? Given the price of used equipment on Gumtree...... https://www.gumtree.com/p/audio-dj-mixers/kam-kka-300-professional-dj-pa-disco-karaoke-mixer-amplifier./1241523118 It will take upward of 2 hours to fix imho......
  16. kellys_eye

    clicking from main board on a panasonic TX-42AS650B smart tv

    Man, that is some fault! Never seen that part of a display go off in the fashion before!
  17. kellys_eye

    Help finding fault with old bass amp that blows fuses

    What fashion do the blown fuses take? 'Just failed', 'blown to smithereens'? Are they the correct type i.e. anti-surge as opposed to fast-blow?
  18. kellys_eye

    Pulling action

    A simple wind screen wiper motor. Fit a pin to the drive wheel at varying distances from the axis, the pin connecting to a rod to do the pulling.
  19. kellys_eye

    Help identifying SMD Diode

    Indicative of reverse polarity applied to the device - be prepared for more faults!
  20. kellys_eye

    MOSFET burning up but similar circuit on another board is fine

    I misread the device as the IRF540 (since I use them quite regularly) but the IRL is definitely logic level.
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