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  1. kellys_eye

    Solar panel equal/unequal siting

    If you connect in parallel then only the 'dominant' panel output would be used. Connect in series.
  2. kellys_eye

    EAS 8.2 MHz antenna design help needed

    .... yes, as part of the RFID system which will detect the tags on 'stolen' property - but not property that doesn't carry the tags. The range of detection is also relatively wide - in the orders of 'feet', certainly not inches. If the products on your conveyor passed at a fixed distance at...
  3. kellys_eye

    ON Semiconductor housing says 'DA30AA'

    It may be a switching MOSFET package - judging by all the vias surrounding the package there is a lot of copper being used to pass what is, I believe, a relatively high current. The tracks going to the other pins need to be shown more clearly to determine more details. They appear to be a lot...
  4. kellys_eye

    EAS 8.2 MHz antenna design help needed

    RFID implies the items passing the antenna will re-radiate a signal as prompted by the RFID transmitter. If these 'conveyored' devices are NOT fitted with the appropriate RFID (trans)responder then your methodology is completely wrong.
  5. kellys_eye

    Repurposing a solenoid array to communicate with arduino

    It's not RS232 controlled. It's a 'simple' serial data stream (clock/data and maybe reset) fed straight to the shift registers. Get the shift register datasheet and you will be able to trace the relevant signal (pins) lines back to the box connector. The shift registers will (probably) work...
  6. kellys_eye

    ON Semiconductor housing says 'DA30AA'

    What circuit is it associated with? What's its location in respect to other devices? Is it part of another onboard system? We need clues....
  7. kellys_eye

    EAS 8.2 MHz antenna design help needed

    The lower the frequency the longer the antenna elements have to be to achieve resonance. To 'focus' radio waves into a particular pattern (that pattern is the same regardless of whether you are transmitting or receiving) requires phasing of the elements to 'mathematically add' the various nodes...
  8. kellys_eye

    Fried pcb for led lamp

    If the pinout matches and the technical spec do as well then float your boat!
  9. kellys_eye

    Project that was working, but then stopped

    The motor will be generating it's own voltage in opposition to the driving voltage. This may well have caused an over-current situation. I'm assuming the circuitry has back-emf protection fitted?
  10. kellys_eye

    Component Identification

    It's not a part I readily identify but if the material is 'ferrite' it may be a simple inductor - otherwise I'd guess it as being a diode. There are some forum members that are more SMD 'guru' than I am and might drop in to assist.
  11. kellys_eye

    Fried pcb for led lamp

    There are many suppliers such as Farnell, RS Components, Mouser etc that stock those items. Most countries have outlets too.
  12. kellys_eye

    Component Identification

    What did you do that caused the component to end up like this? It's rare for a blown component - especially in the fashion your picture shows - to NOT have taken out multiple other parts of that board...
  13. kellys_eye

    Lithium battery BMS

    It takes a surprisingly large amount of heat to destroy common components these days - they are made for 'submersion' (in some cases) and infra-red reflow (and hotplate) methods. 350degC for 15 seconds(??? - don't quote me). Normal soldering shouldn't affect them at all so it's possibly a case...
  14. kellys_eye

    Fried pcb for led lamp

    The diode at the bottom of the last picture is also likely shorted.
  15. kellys_eye

    Lithium battery BMS

    Are we to accept that you fitted and connected the BMS correctly? The usual source for BMS modules is China and there is a possibility you got yourself a lemon. When ordering such modules from China I always get a 'few' ..... just in case. They aren't that expensive and even if they all work...
  16. kellys_eye

    Cannot get this circuit to power up, plus some components I cannot identify

    This is one occasion where a picture of the board may be of advantage.....
  17. kellys_eye

    Cannot get this circuit to power up, plus some components I cannot identify

    It's too easy to get too involved. We all do what we can, as we can, but there has to be a limit. I can't blame/fault the OP for the way they approached this issue as people come here for help and advice without knowing 'how to ask' for it - maybe that should be a 'pinned' page that all new...
  18. kellys_eye

    Cannot get this circuit to power up, plus some components I cannot identify

    If you know what regulators they are then you can figure out the voltage that should be coming from them (obviously) then you can trace the fault BACK if the voltage is missing. The input voltage must be higher than the output voltage..... IC13 is obviously wrong as you show 8.8V on a GND...
  19. kellys_eye

    Cannot get this circuit to power up, plus some components I cannot identify

    I can't do that - I'd have to develop my own schematic (using your own hardware) to find ALL the potential issues with yours. I'm not prepared to do it on a one-after-the-other basis. We'd be here all week!
  20. kellys_eye

    Cannot get this circuit to power up, plus some components I cannot identify

    How did you derive the schematic? There are numerous errors in it so determining the cause of the problem isn't possible unless the schematic is 'correct'.
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