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  1. kellys_eye

    Calculating current limit resistor value

    The PICs ability to sink/source 25mA doesn't mean it WILL sink/source that current. The current that flows depends on either the load (connected to a port configured as an output) or the current that a port (configured as an input) draws from the source. If you are connecting PIC-to-PIC to...
  2. kellys_eye

    Question contact slot and contact conector snes

    Either use it or don't use it. Use it and it WILL wear out. Don't use it and it won't. It will fail in time - everything does. How it fails is not possible to determine give the vast number of parts in it. Your questions are too open-ended. Is there a REASON for all these questions? Do...
  3. kellys_eye

    ISA sockets

    @dave9 - not sure..... the image looks right but the description (PCI) is wrong! @Bluejets - nice one! Although the Aliexpress one is somewhat dodgily priced the Digikey product looks to be what I'm after. Thanks for the help :)
  4. kellys_eye

    ISA sockets

    anyone know where I can get an ISA socket from? I've tried all the usual suppliers but with zero results. I'll take new, used or salvaged. I'm knocking up an old PC/104-to-ISA adapter and can't source an old ISA socket for love nor (so far) money...... If you've got an old riser card or mobo...
  5. kellys_eye

    Inspired Inspiron Modification

    The actual signals on those wires cannot 'travel' very far and 30cm would be pushing it. Monitors are cheap - VERY cheap - and a lot easier to connect to the laptop than fiddling around with screen removal etc. You can mount an external screen in any plane you wish (vertical, horizontal etc)...
  6. kellys_eye

    Unknown capacitor.

    Unless you know the CTR (current transfer ratio) of the opto coupler you'll never know - although you could do tests to figure it out...... Either way 15V sounds ok (it's a 1.3W zener) and 4mA isn't 'wrong'.....
  7. kellys_eye

    How to pair a wireless controller to a receiver

    You said it.....
  8. kellys_eye

    Inspired Inspiron Modification

    Why not connect an external monitor/screen? The laptop has a socket for one???? You can then mount the display where ever and however you want.
  9. kellys_eye

    Unknown capacitor.

    That's only one page of the datasheet - isn't there a page (graph) that shows transistor saturation versus LED If? It shows collector current of 0.25mA at an LED If of 20mA. What resistor do you have in the collector of the optocoupler on that board? Sure the 3k3 resistor you quoted above...
  10. kellys_eye

    Question contact slot and contact conector snes

    1. I have no idea. What condition are they in to begin with? The 'golden layer' is gold-plating and put there to resist corrosion i.e. provide a better contact. As it gets worn away it exposes the material under it. That material is also conductive and will work providing corrosion does not...
  11. kellys_eye

    Calculating current limit resistor value

    The current will depend on the INPUT state of the receiving device, not the OUTPUT of the PIC doing the transmitting.
  12. kellys_eye

    Question contact slot and contact conector snes

    1. No, you cannot keep it working for ever. Everything wears out eventually. Either the socket will wear out or the cartridge edge connector will. 2. Most electronic devices suffer problems with 'age' - even if unused. Most commonly this is because the electrolytic capacitors in the units...
  13. kellys_eye

    How to pair a wireless controller to a receiver

    Get an original dongle.......
  14. kellys_eye

    Softeen 500W Led Fog Machine with Lights, circuit board has melted and I need help identifying it

    The spec offers no clues as to what you need. Details of the rest of the equipment that the output of that damaged board connects to might reveal something. We can gather that the output from the board is a DC voltage or fairly low current and somewhere between 18V and 48V. You could try to...
  15. kellys_eye

    Creating RF Circuit without using RF modules

    Do you know the range, bandwidth etc of the signals you wish to transmit/receive (don't forget you might have to design the receiver circuit to match). Discrete RF design is very complicated - a primary reason for using ready-made modules where all the hard work is done for you - not to mention...
  16. kellys_eye

    Unknown capacitor.

    Got the spec of the opto-coupler? A minimum value of 10mA for If seems quite high to me.
  17. kellys_eye

    GPS ACTIVATED BY TILT SENSOR

    Yes, You need: 1. a GPS 2. a tilt sensor 3. a photovoltaic cell 4. a 9V cell (possibly). :rolleyes: Wire the supply (PV cell and/or battery) in series with the tilt sensor and the power wire of the GPS module Question. What is the GPS supposed to do?
  18. kellys_eye

    New components tests, vs Old components tests

    Yep, as expected, cheap Chinese tester. Although that particular tester is very good (in MOST applications) it's not perfect for ALL devices so you have to live with its limitations. If you want to test such components in greater detail/accuracy you need something like this...
  19. kellys_eye

    Question contact slot and contact conector snes

    Very difficult to determine. It can depend on HOW the board is inserted more than how many TIMES it's inserted. The manufacturers data will be derived from an automated process (testing procedure) that inserts it 'properly' to get the best possible answer! In a real world situation you can...
  20. kellys_eye

    What is preferred Receiver IC for MICRF114

    You can use any device you want for the receive circuit providing it operates in the correct frequency band and outputs the appropriate code. Using devices from the same manufacturer can simplify sourcing and (potentially) interfacing but that depends f they actually make a comparative device.
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