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  1. kellys_eye

    Need help with QFN packaged IC for breadboard

    Here's an adapter board: http://schmartboard.com/schmartboard-ez-5mm-pitch-64-pin-qfp-qfn-to-dip-adapter-204-0018-01/ actual sockets start at around $130 :eek:
  2. kellys_eye

    So, I built a guitar neck with LEDs in it .....

    The LED brightness can be adjusted by fitting a PWM dimmer circuit in the +ve feed line.
  3. kellys_eye

    1970 Delco Radio Repair - audio distorted

    Distortion levels of 10%+ are quite common but check that your PSU can deliver the required current before condemning it.
  4. kellys_eye

    Dual NR 5 DAB Radio. Leak on circuit/power board...

    Check the diode in this picture first: D1, above the inductor.
  5. kellys_eye

    What charger to use for LI-ion batteries

    The OP's reference was to an 18650 charger that operated from a 12V source....
  6. kellys_eye

    Should i short the chopper transistor for a ac adapter?

    Not without permanent damage - let the smoke out etc. But the internal fuse will probably blow first.
  7. kellys_eye

    Sick of my breadboard! quality breadboard recommendations please.

    Get one from Rapid or Farnell. If it cr@ps out on you then get a replacement under warranty.
  8. kellys_eye

    What charger to use for LI-ion batteries

    Why not? A single 18650 is only needs a 4.2V (give or take) charge voltage and a module powered from 12V would have no difficulty with that.
  9. kellys_eye

    Electrolytic capacitor questions (reversed polarity)

    Simple diode wired across the LED and a series current limiting resistor will work. Fitting them into the old bulb holder is a good idea - possibly fiddly, but a great looking result.
  10. kellys_eye

    So, I built a guitar neck with LEDs in it .....

    The effect you're noticing is akin to switch contact bounce - fairly easy to deal with in a software sense but a bit more involved using discrete parts. Post your schematic 'as is' and we'll see what's the best method at fixing it.
  11. kellys_eye

    Help with fence charger schematic

    Not any more! SIX joules though...... the recommendation is 1 joule per 6 miles of fence. I don't know your circumstances but the attached article below might give you a start...
  12. kellys_eye

    Layman's method for troubleshooting CD4016 analog switch IC help please

    You aren't understanding the principle of the 'on resistance' properly. The value you quote (200-300Ω at 9V) is the resistance (in-to-out) of the switch if it is powered from 9V DC i.e. the chip ITSELF is powered by 9V DC. I don't know what your system (circuit) supply is but it's likely to be...
  13. kellys_eye

    Electrolytic capacitor questions (reversed polarity)

    Are those the 'right' capacitors for the job? I mean - the ones you fitted are 'polarized' in the sense that they can only be inserted in one position due to the tab positions. If they were 1-for-1 replacements how can you get the job wrong? Another thing - how OLD are those capacitors? Even...
  14. kellys_eye

    What charger to use for LI-ion batteries

  15. kellys_eye

    Sensor to detect force from an angle

    Only if the weight hits both targets simultaneously....
  16. kellys_eye

    Doubt about which fingerprint reader to choose

    Nor can I !!! Under the circumstances I'd go with the device that has the most useful support mechanism attached - in this case the device I recommended on the basis of demo software.
  17. kellys_eye

    Layman's method for troubleshooting CD4016 analog switch IC help please

    Depends on the switch 'on-resistance' as many multimeter continuity buzzer ranges only work on sub 100Ω values (or less - check your meter spec sheet). Best check it by measuring the DC across the switch in it's open/closed state.
  18. kellys_eye

    Using a REED SWITCH with uC Question

    Pull up resistors are the most commonly used method and some μcontrollers have them built into their I/O ports - check the datasheet to see if your particular port offers this.
  19. kellys_eye

    What charger to use for LI-ion batteries

    The 18650 is a 'generic' Lithium, very commonly used these days and there are dedicated chargers for them as well as simple circuit board modules for charging them singly, in pairs, in series etc. Google '18650 charger' and see what comes up.
  20. kellys_eye

    Battery Level Indicator

    Define 'battery level indicator'..... do you want to know it's level 'intimately' or just when it's falling below acceptable limits? There are methods that offer bar displays (LM3914) for a graduated indication - go/no-go LED displays with Red, Yellow and Green indications (often used in...
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