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  1. kellys_eye

    Help with my University Project !!

    'Fan out' would be the usual specification t look for but that doesn't seem to exist for the Arduino. But given you can drive a 20mA LED directly you should be able to determine the drive capability from the information associated with the 'input' of the display logic board(s). Having said...
  2. kellys_eye

    3D Printer Thread

    Nice! Many people fail to appreciate the need for a properly stable mounting for CNC's and 3D printers. That solution is excellent!
  3. kellys_eye

    Crimping Problem.

    The rather obvious answer is that you need a Molex tool for molex crimps - the tool you link to makes no specific statement of compatibility to molex crimp parts so you 'get what you pay for'. A crude method would be to file the tool housing to prevent crushing of the insulation when the right...
  4. kellys_eye

    Leaked Battery Motherboard Repair

    No worries - hope your family member recovers soon.
  5. kellys_eye

    Simple button Repair (I hope)

    You should be able to trace the pcb tracks back to the actual connector that takes the on/off signal off-board to where ever it goes and solder wires there instead. Fit a small toggle switch somewhere on the back panel. I doubt if aesthetics are an issue????
  6. kellys_eye

    Disable backlight of LCD monitor

    Very, very vaguely..... I've repaired many laptops where the owner swears blind that the screen is 'dud' (because the backlight has gone off and they can't see 'anything') but if you hold a torch at an angle to the screen you CAN see an image. It's almost.... almost invisible if the backlight...
  7. kellys_eye

    Please Check My Circuit

    It's overly complicated the way you've drawn it. Do you need a dual power source? Do you need the relays? This is the basic connection arrangement for bi-directional motor control. SW1/SW2 are the limit switches and the DPDT switch could be a relay operated from an SPST switch.
  8. kellys_eye

    Oscilloscope probe question.

    setting me up for a fail eh? LOL....... You should have asked.... I have a spare 'scope (only 20MHz though) you could have had for £30..... (plus postage at cost).
  9. kellys_eye

    Help needed with caps

    Yes it will work. It will actually store more energy than the original so you might see a little increase in firing power.
  10. kellys_eye

    3D Printer Thread

    It loooks as if the table it's sat on is made from a steel or aluminium plate (a thick one too!) or is this just the image resolution and it's actually an upturned piece of worktop material?
  11. kellys_eye

    Blown multimeter fuse again - Doh!

    Only ever blown a meter fuse once - the lower current range - sometime around 1978 iirc :D - it's something you (should) very quickly realise is a PITA thing to do and subsequently adopt the correct meter usage methods to prevent it happening again.
  12. kellys_eye

    3D Printer Thread

    Yeah... Santa let me down with my request for a Bugatti Veyron last year too - seems like I forgot to specify the colour! I'll be having a word with him later........
  13. kellys_eye

    3D Printer Thread

    Sadly not for me. I can see that the technology has come on leaps and bounds since I first took notice of 3D printers but they still aren't (imho) as useful and reliable as I'd like them to be before I could justify committing to one. Out of curiosity, how much does a typical 3Dprint cost in...
  14. kellys_eye

    Magazines

    Talk about being a geek..... as a young lad I frequented the Central Library in Middlesbrough to browse their substantial collection of back issues of electronics magazines. They had every issue of Wireless World magazine going back to 1913!!! A few decades later I tried to go back to have...
  15. kellys_eye

    Magazines

    Your recent post quoting a variable PSU from 1979 made me check out my issues only to find they were completely different. I wonder if all the ETI Australia were totally different from ETI UK? Nowadays the major magazines have the same content regardless of the country they are published in.
  16. kellys_eye

    Help with increasing the power of a Philips hue bulb Frankenstein "hack"

    Only if your LEDs are meant for 240V operation - the circuit board usually has the conversion circuitry for CC operation fitted and drives them at a much lower voltage.
  17. kellys_eye

    24volt inverter question

    In which case...... I was basing my experience on 12V batteries at 14.2V each... the last time I used cells (or batteries under 12V) was when I had to do a daily service on 2V cells used to make up the emergency battery banks on merchant vessels!
  18. kellys_eye

    Magazines

    ...and a laugh at the adverts for 5-1/4" floppy drives at $999 :eek:
  19. kellys_eye

    Magazines

    I love 'em - the electronics ones of course :p I used to be an avid collector of the printed issues - as a kid it took up all my spending money and I purchased every issue of every type I knew of: Wireless World Practical Electronics Practical Wireless Everyday Electronics Elektor ETI and...
  20. kellys_eye

    Circuit Element for variable current control

    You cannot 'add' two voltage sources (supplies) though. One or the other will take control. Fitting two diodes to prevent 'feedback' will only make one or the other supply 'pass'. You can add current but only if both supplies are equal in voltage - again, if the supplies aren't equal, then the...
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