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  1. kellys_eye

    Alternative Energy Charge Bank

    Get rid of R2 and replace R1 with a wire link. Add a series resistor to the LED. The regulator (7805?) will probably require a heatsink - depends on how much current the USB ports are designed to deliver. If it's more than 1A total then you'll need a different regulator than a 7805 (assuming...
  2. kellys_eye

    Alternative Energy Charge Bank

    What device are you using to regulate to 5V?
  3. kellys_eye

    Alternative Energy Charge Bank

    You don't need a voltage divider. The regulator IC will accept a 12V input quite happily. The resistors will only offer a constant drain on the batteries and operate as a (poor) heater - nothing else.
  4. kellys_eye

    Alternative Energy Charge Bank

    What is the reason behind the inclusion of R1 and R2? They will do nothing other than discharge the battery. C1 and the LED should be across the output of the regulator IC and to 'ground'. The shorting link between them should be removed.
  5. kellys_eye

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

    Precisely. The driver boards are designed to deliver the appropriate voltage at the correct current. Increasing the voltage and/or current might not be possible by modification alone but may require a complete redesign. This is not easy to determine from just pictures. You would have to...
  6. kellys_eye

    Dolls house lights on 6ch timer

    Look at the connection drawing. One side of the bulb goes to the pcb connection, the other side of it goes to the 3-15V line (whatever your power supply is). The pins look to be positioned (left-to-right) as per the diagram but I cannot confirm this without being able to see the reverse of...
  7. kellys_eye

    crt tv horizontal display problem

    If the horizontal yoke is shorted it will cause an overload of the power supply and shut the set down.
  8. kellys_eye

    Have I bricked my Arduino Uno? Problems with uploading to board

    If you used the correct cable (USB presumably) then you 'can't' brick it.... if you've used some other power supply, changed the board wiring or otherwise modified the equipment then you may well have bricked it. Tell us the truth!
  9. kellys_eye

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

    Similarly, the cost and trouble of making such a modification would exceed the cost of a second system anyway....
  10. kellys_eye

    Need advice on issues with a 40pin 0.5mm pitch FPC cable and its adapter

    You really should SOLDER the connections - that's what the board is meant for.
  11. kellys_eye

    Dolls house lights on 6ch timer

    You've already got the connection drawing - see above. The circles with crosses in them are the bulbs.
  12. kellys_eye

    Disable backlight of LCD monitor

    He doesn't show the rear of the display. You can get that effect by removing not only the back light but also the covers over the back of the display panel itself such that ambient light passes through from rear to front. This is why his display is 'disassembled' ...... With the covers still...
  13. kellys_eye

    Ground Zero amp help!

    PT-D (pin2) on the SMPS control board is the feedback signal.
  14. kellys_eye

    Capacitor

    What tolerance are you working to? Electrolytics can have tolerances of -10% to +25% quite easily. If using in a timing circuit it is normal to obtain the nearest standard value (in this case 2.2μF) and adjust the associated resistance. If the capacitor is being used in a filter circuit where...
  15. kellys_eye

    Need to find an alternator

    Anything UNDER the recommended charge rate is fine - just like discharging a battery can cause damage/shortened life, so can over charging. A 500mA charge rate is more than adequate in most standby circuits and a simple stepper motor based alternator/generator will be able to keep that charged...
  16. kellys_eye

    Sample circuit for motion sensor

    Far be it for me to comment but.........
  17. kellys_eye

    Dolls house lights on 6ch timer

    The timer has six channels, each of which can be preset to be activated for periods of 0-9 seconds (the longer time intervals are only available if you power the unit from 3V). The outputs (1-6) activate sequentially, each output remaining 'on' for the period you set using the adjustable...
  18. kellys_eye

    Need to find an alternator

    Most gel cells only require a 0.2C charge current (in your case 0.9A) so a 50W charger is over the top for your needs.
  19. kellys_eye

    Need to find an alternator

    Try using a larger stepper motor - they are commonly used in 'demo-style' wind turbine applications but I'm not entirely sure what power output they give but larger version may just top the 50W mark perhaps??? <update> I've seen a webpage that reports a type 34 stepper outputting around 20W at...
  20. kellys_eye

    PwM using microcontroller

    The output voltage will depend on the duty cycle and the RC time constant. You would only ever get the full 5V at 100% duty cycle (i.e. permanently 'on'). Use another timer - triggered by the rising/falling edge of the i/p PWM signal.
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