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  1. kellys_eye

    Help needed creating a toy train project

    The KISS principle applies here (Keep It Simple, Stupid). By far the mechanical construction will take most of the time and effort. Being a simple DC motor, forward/reverse is very simple to achieve using a DPDT switch. Using a simple 'limit switch' arrangement (microswitches front and rear)...
  2. kellys_eye

    Processor 80286 _ Application errors_urgently help needed!

    A COM Port is obviously enabled - is it connected? Is the device connected to it working?
  3. kellys_eye

    OP-amp help

    Providing you identify the SIGNAL wire then yes, you cut that wire and send the signal into your comparator circuit and take the output from the comparator back to the free end of the cut wire. Ground is 'common' to all the circuits and is the chassis of the vehicle too.
  4. kellys_eye

    CNC Plotter with DVD stepper motors

    The output voltages are far too low. Fit 10k pull-up resistors between ALL the Data pin outputs and the +5V rail (8 resistors needed).
  5. kellys_eye

    Help needed creating a toy train project

    Do you know the weight of the finished train (approximately) and whether or not it will be pulling any carriages? The easiest obtainable motors would be something like a car windscreen wiper motor or electric window motor - both would have the gearbox requirement already fitted and enough...
  6. kellys_eye

    CNC Plotter with DVD stepper motors

    If you change the 'polarity' of the wiring to only one of the stepper coils you might get the motor to work. Changing the wiring to both coils just reverses the original problem. A stepper motor requires a specific bit pattern sequence to be sent to the coils in order for it to rotate - Use...
  7. kellys_eye

    LED strips for vanity/accent lighting?

    It might not affect the total lumen output measurement as a numerical figure but it certainly shows itself in a subjective way! A 100lumen source could be a radiant device with TOTAL spherical coverage or one with a very narrow beam (still its total output though) but the narrow beam one will...
  8. kellys_eye

    Inductive load on relays

    Are the 12/24V supplies on a common ground circuit? Do they need to be?
  9. kellys_eye

    CONNECTION TYPE

    Can't see your image. Too big perhaps? Post link.
  10. kellys_eye

    CNC Plotter with DVD stepper motors

    Did you check the motor pin out? Does it match the L293 outputs? Assuming the motors are correctly wired you need to measure the step signal outputs ot ensure they are both 'therre' and in the correct sequence. Use a ttest meter to measure the step signals for individual step movements.
  11. kellys_eye

    Connector type

    Sorry, I can't help with your request but full marks for the clearest pictures I've ever seen on this forum. We should 'pin' this post as an example of how it SHOULD be done.....<thumbs up>
  12. kellys_eye

    Network Time Display

    What devices?
  13. kellys_eye

    CNC Plotter with DVD stepper motors

    In what way? Not moving? Missing steps? Too many steps? I don't see any decoupling capacitors on the devices or supply lines either.
  14. kellys_eye

    linear actuator controller, manual or automatic

    Have a look at the simple Radio Controllers servo motor. This is a motorised linkage device whose position is set by the width of a pulse (1mS to 2mS IIRC). You could make a simple 555 astable with one of the timing elements a thermistor and, with the correct choice of timing capacitor and...
  15. kellys_eye

    OP-amp help

    I think you misunderstand the true meaning of 'AC' - the signal is actually DC with an AC component. Irrespective of this either the op-amp or comparator circuits will do as you require. Personally I'd go for the comparator solution. Can you measure the voltage at points 'V' and 'S' with...
  16. kellys_eye

    Line transient/load response circuit

    Have you checked the data sheet? Look at the line and load transient response times.
  17. kellys_eye

    LED strips for vanity/accent lighting?

    And thereby lies the rub. 'bulbs' and 'strips' are apples and pears and can't be directly compared. Indeed, different bulbs (shapes) will have different illumination qualities and light output is only relevant, as I tried to make out, when comparing like-for-like. This has always been the...
  18. kellys_eye

    Stepper motor control

    Quoted from the Arduino site: "The microcontroller on the Arduino and Genuino AVR based board has EEPROM: memory whose values are kept when the board is turned off (like a tiny hard drive). This library enables you to read and write those bytes." But for a simple positional control actuator...
  19. kellys_eye

    12 V motor loss of power

    "no speed control"? - contrary to all the PWM speed controllers that currently exist? "big electrolytic input capacitor"? - not specifically? and why would this be a problem? Regardless.... personally I'd change the system to a stepper with LCD readout and programmability in a move towards...
  20. kellys_eye

    Transceiver Circuit

    So would I.... but we can't really expect a professional schematic for such a cheap'n'cheerful device. It serves the purpose - to those that have the basic concepts of schematic reading...
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