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  1. kellys_eye

    Must unplug and replug power to make Cooker Hood / Kitchen-Fan work

    The lights are powered directly via a transformer and have no other intermediate controllers so the fault must be the transformer. If it is fitted with a thermal overload it may be the reason for the problem. Check that you have the correct wattage lights fitted - anything higher than the...
  2. kellys_eye

    What type of UART I need ?

    What make/model of router? What did you do to cause it to be bricked?
  3. kellys_eye

    Microchip reading and copying data. ( how to diy manually?)

    You would have to remove the device from the board and install it in the appropriate socket and read the contents using the proper programmer. To do this manually would be as good as impossible..... one wire for each address line, one for each data line so 64 individual wires? Then you have to...
  4. kellys_eye

    No output left channel phono stage of Sony preamp mod. TA-E90ES

    Changing them as a pair is your decision but you must set the bias correctly after changing either of them. Do you have the instructions for doing this?
  5. kellys_eye

    No output left channel phono stage of Sony preamp mod. TA-E90ES

    If measured with respect to 0V it indicates Q115 short circuit.
  6. kellys_eye

    Starter Equipment

    Why would you be using the 'scope and spectrum analyser? Isn't that a bit excessive for someone who is 'getting started in Ham Radio'? Bit like learning how to ride a bike by purchasing a Kawasaki Ninja ZX-11........
  7. kellys_eye

    My IC chip isn’t working properly

    It also costs (about) 50c - it can't be fixed but it can be replaced......
  8. kellys_eye

    Explanation of a circuit

    Given this is a 'class work' assignment we aren't about to hand you the answers but instead we point you in the right direction in order for you to find out for yourself. Google the data sheet for the UM66 and read about what it does, how it does it and how it is used. All the information is...
  9. kellys_eye

    Sutibility of motor in fighting robot feather weight

    With any given motor you sacrifice speed for torque (if using gearbox for reduction) - calculate your required speed and, from that, you can determine the maximum reduction ratio for the maximum motor rpm. Your current setup has 3450rpm, a 6.25:1 gearbox (which gives 552rpm at the wheels) and...
  10. kellys_eye

    Car Cd Player AUX input

    Far easier to change the complete head unit to an after-market version that has all the facilities and ports you actually require.
  11. kellys_eye

    Sutibility of motor in fighting robot feather weight

    Unless you're prepared to delve into the dark arts required to 'calculate' the suitability of a particular motor, the best you can do is 'suck it and see'. You don't state the actual function the motors will be used in - locomotion, leverage etc. Speed? Torque? Which is important to you...
  12. kellys_eye

    Controversial schematic symbol

    Electronic schematic symbols follow one of three standards: IEC (British) ANSI IEEE (American) and whilst there are similarities between some, there are also some (glaring?) differences too. Ideally, any schematic is drawn using ONE standard (try not to mix standards!) and the symbols readily...
  13. kellys_eye

    Homemade Multi-Drill

    Depends on the load on the motor - the current will be anywhere between the no-load value (160mA) and it's stall current (whatever that is). Only you can tell.
  14. kellys_eye

    Power powerwheels

    If you're keeping the speed the same, all you will achieve is more torque. Is this actually required? The increase in supply voltage/current would make any battery powered solution very brief indeed.
  15. kellys_eye

    Audio Circuit Collection

    ...the 'usual suspect' place.... currently showing 0 seeding and 6 leeching so I don't think you'd have much luck there. The 17Gb file is when it's zipped too! It's unpacked size must be enormous! I've only ever looked in the zip packets and extracted schematics out of curiosity, never for...
  16. kellys_eye

    Update Audio

    Is there a device number on the 8-pin chip? If so, you could get the datasheet for the device and see if it is reprogrammable. Alternatively there are loads of small speech-recording modules (MP3) on the internet that could be used to record 'anything' and playback at the press of the button...
  17. kellys_eye

    Power powerwheels

    If it is 18A at 'full load' then the motor is an 1800W motor. The booster you link to is rated at 15A max so unsuited to drive your motor. If you're planning to replace a 'D-cell sized motor' with an 1800W motor you need to seriously consider your mechanics!
  18. kellys_eye

    Tips on tracing complex PCB circuits:

    Make a printout of the solder side IN REVERSE (there is a 'mirror' function in PaintshopPro for example) and print the component side normally. You could even print the component side on an overhead transparency and overlay it on the reversed pcb side.
  19. kellys_eye

    VU meter with zener diodes?

    A simple chain of diodes (0.6V drop across each) as the reference inputs to a load of comparators (or switching transistors) would 'simulate' the LM3914 - you'd need to use a resistive chain with values suited to a logarithmic spread to get the LM3915 functionality.
  20. kellys_eye

    How to create multiple simultaneous signal sources from a single reference source?

    Oscillators and mixers (with suitable filtering) will do it. A bog-standard receiver can produce (almost) DC to many GHz using such principles.
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