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  1. kellys_eye

    DAC controlled voltage regulator

    Probably easier to adjust brightness by modulating the laser beam using a PWM signal. <edit> - seems like you beat me to the punch!
  2. kellys_eye

    Connect several wires without relays?

    Simply - use diodes. Sounds very much like an X-Y switching arrangement to me.
  3. kellys_eye

    Stepper motor control as input? Arduino

    Lots of ways to do it. Google 'stepper motor as encoder' for a million schematics. You can only get accuracy as good as the full step spec of the motor (no micro-step accuracy) so whatever steps/rev of the motor is as good as you'll get.
  4. kellys_eye

    Using a Voice-Activated Switch to Control My TV Remote Mute Button

    Tune to a different channel.... I mean....CNN???? c'mon.......:p
  5. kellys_eye

    Multi meter question?

    If all you're using a meter for is bench work then any cheap meter with suitable accuracy will do. There is a lot of internet discussion and enthusiasm for the ANENG AN8008 ($25 or under) as it reads to an accuracy of μV, has a 10,000 count display and is pretty well supplied with all the...
  6. kellys_eye

    Touch activated torch - increase sensitivity

    Look at the parameters of the switching FET. You need one with a very low gate threshold voltage. Search the usual sellers sites using their parametric search options.
  7. kellys_eye

    Mystery Wiring, Need Help.

    <stands well back enjoying the confusion> :D
  8. kellys_eye

    Gear VR Internal Connectors

    Going 'to the top' is the sure way to get answers! If your idea would only go to promote the Gear VR product itself then I'm sure you'll get all the assistance you need.
  9. kellys_eye

    Press a button to start a timer project? Thanks.

    Circuits you need are: Clock signal generator (to whatever accuracy required) Gating device - simple (N)AND would do Counter/display On a 'basic' level, a 555 can do the clock signal; a 74-series (N)AND gate (or NOR) will do the gating: and you can adapt a simple calculator to do the display...
  10. kellys_eye

    Mystery Wiring, Need Help.

    Two ways Way #1 Join A2, B2 and C2 Join B1 and C1 - connect to -ve supply Connect +ve to A1 Way #2 RTFM :D
  11. kellys_eye

    Treadmill Motor Controller Board issue

    Without making some test it is impossible to say whether it is just a semiconductor failure or as a result of some other cause. This is usually why, when we buy spares, we buy TWO! The potentially blown part is either a switching transistor (likely) or a regulator. Again, the pictures aren't...
  12. kellys_eye

    Delayed on circuit

    You can purchase relays with the function already built-in. http://www.ebay.co.uk/itm/DC-5V-12V-24V-Infinite-Cycle-Delay-Timing-Timer-Relay-ON-OFF-Loop-Module-Time-/252400618718?var=&hash=item3ac43fccde:m:mRsP0STfssPVTesifg04gQw If you want 'permanent on' you may have to add a relay and wire a...
  13. kellys_eye

    Are Ebay 365nm UV LED‘s good for fluorescence?

    Given your very specific requirement I'd recommend you simply used a reputable dealer (Farnell, RS Components, Rapid etc) to obtain the parts you need. The difficulty, time and expense of purchase, testing and returning (if necessary) of potentially suspect parts isn't worth it and may even...
  14. kellys_eye

    Ring Light LEDs ???

    Ain't that always the way!
  15. kellys_eye

    Replacement Motor - Sewing machine (Stepper or Servo?) More torque needed

    When I've seen sewing machine operators use similar systems they always, and I mean always, start the sewing by manual rotation of the wheel as they press the pedal. This gives the motor the starting torque necessary to prevent it over-speeding when you 'get your foot down'. Could simply be a...
  16. kellys_eye

    "Variable Voltage Battery charger"

    It's the type of battery you intend to charge that decides whether constant current or constant voltage (or a mix of the two) is required. Research battery chemistry basics to see how each type delivers power and the way in whch they are required to be recharged.
  17. kellys_eye

    Treadmill Motor Controller Board issue

    I'll add to this and say that I've seen, read and commented on these treadmills for faults on multiple occasions. It doesn't hold them in good light to be 'constantly' breaking down as they appear to do.
  18. kellys_eye

    Treadmill Motor Controller Board issue

    Regardless of the fault 'as is' you have to consider what CAUSED the fault in the first place as simply replacing the burned out part may just cause it to happen again. If you could make some clearer pictures of the circuit boards we may be able to offer some further advice.
  19. kellys_eye

    Chip Sheet Data

    Yes it is a TTL chip. It's a HEX inverter - six basic NOT gates. And, yes, you can use it on your EPROM. What do you want to use it FOR?
  20. kellys_eye

    "Variable Voltage Battery charger"

    A rheostat will only vary the voltage according to the load. Vary the load and the voltage will vary too (for a given setting of the rheostat). Do you want constant voltage, constant current, 'controlled voltage', controlled current, staged charging, managed charging, trickle charging etc etc...
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