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  1. kellys_eye

    Measurement device

    If the tape has regular markings on it you can use opto-devices to record the number of 'marks' that pass under the sensor. Its accuracy would only be as good as the actual markings on the tape though. Another method would be to couple the centre of the tape reel to a slotted disk with a much...
  2. kellys_eye

    Older 40" Samsung TV to play around with! Score!!

    Careful with your scope. If you get the wrong side of earthing you'll have a nice large spark and bang happening..... Not a lot inside them these days. Older equipment - i.e. thru-hole mounted parts - are the best devices to get although if you have experience with SMD stuff you can salvage...
  3. kellys_eye

    Interesting unit

    Given that Chinese suppliers can deliver electronics goods for less than we can purchase half the parts locally it comes as no surprise! Quality? Questionable - but at least you get all the parts to re-configure it yourself.
  4. kellys_eye

    Headset for MOTOROLA TLKR T50

    All major manufacturers of walkie talkies have such models - you just have to go to the correct price point (i.e. more expensive) to get them....
  5. kellys_eye

    DSC Pc300 keypad

    More details needed. What equipment is it from?
  6. kellys_eye

    Help with a connector (Newb Question)

    That's a DIP IDC (insulation displacement) connector - used to be quite common before they changed to 'box headers'. Can still be found here: http://www.jdr.com/product_p/idp16.htm
  7. kellys_eye

    Code Reader?

    I have an SDR receiver (self contained) that has a code reader as part of its built-in software and it's remarkably accurate. Never use it though as I'm ex merchant navy and can read code to 50+ wpm (well, around 35 wpm at the moment, still getting back into the swing of it!). There's no...
  8. kellys_eye

    Vss vs. Vdd vs. Gnd

    Vss and Vdd are your power lines. Vo is a variable voltage taken from a preset resistor wired across the supply and is used to control the LCD contrast - without which you won't be able to see the digits.
  9. kellys_eye

    What's this called (knob attachment)

    Thursday?
  10. kellys_eye

    Headset for MOTOROLA TLKR T50

    There is no way to connect an external headset or PTT switch to that equipment.
  11. kellys_eye

    Help

    Where do the 'blue' wires go that disappear off the bottom of the picture?
  12. kellys_eye

    Help

    Show the other side of the board as well...
  13. kellys_eye

    Relay swap pinout

    The initial relay has CHANGE-OVER contacts but the new one has only NORMALLY-OPEN contacts. If you need a change-over function then the new relay won't work.
  14. kellys_eye

    Capacitive Switches Car

    There are a gazillion illuminated push button switches with momentary, latching, change-over etc contact option available through most component suppliers. I see no reason why you would want to use capacitive switches that add unnecessary complication when 'professional' looking devices are so...
  15. kellys_eye

    What's this called (knob attachment)

    Been there - facepalmed loads of occasion! Some of the simplest thought processes seem to get stuck for no apparent reason :p My excuse (and very reasonably) is age...... what's yours :D
  16. kellys_eye

    Bypassing TV's internal speakers to home-made aux input

    Is that a SCART socket I see on the rear panel? (above the antenna input). If so, why not take the audio from there?
  17. kellys_eye

    Trying to set current on DRV8825 stepper driver board

    Have you got the GROUND pinS all grounded? Emphasis on the fact there is more than one ground pin.
  18. kellys_eye

    Bit of quiz fun

    It's a question mark.
  19. kellys_eye

    Dial cord slipping

    More like some old test equipment to me - the knob is a giveaway..... If you mark the cord with a marker pen when it is on the turning shaft and at the 'slipping' position you can then wind on past (or before) that point and apply rosin to the marked areas on the cord. Cord replacement is the...
  20. kellys_eye

    What is this SMD component?

    I think the OP could put us all out of our misery and just measure the darned thing!
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