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  1. kellys_eye

    Magnifying lens help needed pls.

    Other than a handheld magnifying glass I've got a webcam with a 'macro' lens that I use with my adjacent PC. The webcam is on a goose neck and has an LED light-ring. This works well when I need it but I have plans to fit a small camera directly to the rear of a 7-inch LCD screen, also on a...
  2. kellys_eye

    Building a New Fish Tank Stand

    230V or 120V? Which country? What distance is it from the main board to your sub? This will determine the c.s.a. of the main feed cable required. Is it all indoors or will it run outdoors? You may need armoured cable in unprotected or buried runs. What is the TOTAL expected load on the sub...
  3. kellys_eye

    trigget 12V relay from 1.8V

    ....otherwise known as a 'window comparator' (Google will reveal)
  4. kellys_eye

    Automatic Blow Off For A Conveyor

    16.56 seconds seems pretty specific..... either the bottles are moving at one heck of a rate past the blow-off point or you've been over-egging the accuracy required. As for ??? They used to use analog monostables to create the basic digital games (i.e. pong) on TV screens using line/frame...
  5. kellys_eye

    Automatic Blow Off For A Conveyor

    A decent monostable circuit would do it. Loads of ways to skin that particular cat. Google the bold word with 'schematic'
  6. kellys_eye

    LCD to OLED Change

    Getting an OLED display of that size will be difficult and expensive. It's still an emergent technology and all the screens I've seen so far are tiny..... That particular LCD is still available on eBay though...
  7. kellys_eye

    Identifying LCD Display - VDO Logic Combi

    The paper strip test is what's puzzling me. The two terminations at one end may be the back light, the other two 'could' be a serial interface but the PCF8578 actually IS the display driver device for the LCD itself: http://pdf1.alldatasheet.com/datasheet-pdf/view/18218/PHILIPS/PCF8578.html...
  8. kellys_eye

    Graphic LCD : lines at the start and then off (or fully black)

    The transistor circled in image BOARD2 - adjacent to L600 - looks to be blown. If you've recently replaced it I suggest you got the EBC lead arrangement wrong. Many of those TO92 devices have differing pinouts and need to be carefully checked before fitting.
  9. kellys_eye

    Identifying LCD Display - VDO Logic Combi

    The LED obviously needs sorting - it's the backlight for the display, naturally. The PCF8578 is the display controller and addresses the rows/columns of the LCD and the thru-hole board connections adjacent to the chip would be the normal means of connection. I'd have guessed that the...
  10. kellys_eye

    Sharp Compact Disk Player

    Use a laser cleaner disk.
  11. kellys_eye

    Identifying LCD Display - VDO Logic Combi

    If one end has two pins and the other 8 or 10 then it sounds to be a fairly common type and should be replaceable. Can we see the reverse of the board (where the pins solder through?). Note that the display is usually a one-piece device and that the metal 'bezel' should be considered an...
  12. kellys_eye

    555 timer smd

    Body length is usually irrelevant too. It's pin pitch that counts.
  13. kellys_eye

    Building a LCD 7 segment display watch from scratch

    You will need the control electronics, presumably a small processor, that can do the timing and drive the display plus any other 'housekeeping' functions. This will mean researching for the right device that has: the correct supply voltage requirement (usually around 3V) low power consumption...
  14. kellys_eye

    Lots Of New Resistors And Other Things

    Seems like you're getting the same response re the 'value' of these parts from other sites you've advertised too (UK Vintage Radio) - same concerns over quantity, same suggestions over breaking them down into manageable sized amounts.... Not say 'I told you so' but perhaps it would be better...
  15. kellys_eye

    Need Help identifying unknown circuit..

    It's a hard disk interface board usually fitted into casings that accept a small IDE or SATA drive. Otherwise known as external HDD adapter. The drive mechanism plugs into the black socket and you connect it to your PC/laptop using a simple USB cable. If you have a spare 2.5" HDD then put the...
  16. kellys_eye

    Who gets there first!

    Connect a simple generator to the driven wheel. Measure the voltage output and feed it to a comparator. When the speed reaches a preset point it can be arranged to light a lamp (and lockout the other bikes from triggering it).
  17. kellys_eye

    Leaked Battery Motherboard Repair

    Check your flux is made for electronics work and make sure you clean off all the surplus after use.
  18. kellys_eye

    Lots Of New Resistors And Other Things

    There's not a lot of anything particularly useful amongst it all. I have 100 each of every resistor in the E24 range and even that's more than I need! A few THOUSAND doesn't help.
  19. kellys_eye

    Help identifying a display

    You might want to look up the difference between reflective and trans-reflective displays. Modern displays using OLED technology are perfectly readable in sunlight.
  20. kellys_eye

    Power supply problem

    That device is to deliver 3.3V or 5V.
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