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  1. BobK

    What are these 10$ Logic Analyzers on the Ebay ?

    Oliver, What do you mean by not being real-time? A logic analyzer is not real-time by definition, is it not? They work by capturing data over a certain period of time, then allowing you to browse the results at your leisure. Bob
  2. BobK

    Basic LED help please!

    You would be much better off powering it from a lower voltage. You are wasting over 80% of the power when driving it from 12V. The forward voltage of IR LEDs is typically lower than the 2V you calculated. I am using one that take 200mA and its forward voltage is 1.35V. Bob
  3. BobK

    ANSI C IDE?

    C is a subset of C++. Typically, a C/C++ compiler will compile either depending on the extension you use. .c means it is a C file. .cpp means it a C++ file. MS uses the standard stdio library if you are coding in C. You can also use it in C++ if you want. Also, C compilers will typically...
  4. BobK

    How do you PROPERLY split a wire into two or three ?

    You would want to find out what local electrical code requires. Here in the U.S you would use a junction box, and wire nuts to join the wires. Bob
  5. BobK

    I'm back - a new circuit for the mini-golf course

    I suspect that the 19th hole allows you only one shot. It either goes in the hole, or goes away somewhere else, ending your game. Bob
  6. BobK

    Display cabinet - PIR motion sensor & LED lights

    Since the PIR sensor already has a 1K resistor on the output, eliminate the base resistor. It would also help if you didn't have the emitter and collector reversed. Bob
  7. BobK

    Basic Question: Transistors as Switches

    A PNP the transistor is on when the voltage on the base is low compared to the emitter. If the voltage you are switching is the same as the voltage supply for the IR sensor, you simply connect the output of the sensor, through a suitable resistor to the base of the PNP. The emitter of the PNP...
  8. BobK

    Series pass voltage regulator not working as expected

    Instantly? Violate the laws of physics. Yes, a resistor to bleed the capacitors will help. Bob
  9. BobK

    penetration of em spectrum's

    It comes down to the fact that the difference in energy levels of electron orbits fall in or near the energies of photons in the visible light portion of the EM spectrum. Bob
  10. BobK

    Looking for a component marked "made in Austria"

  11. BobK

    Help Getting Started with PIC Microcontrollers

    Fine, but why confuse a poor hobbyist who is not producing commercial projects? Bob
  12. BobK

    Help Getting Started with PIC Microcontrollers

    That is nonsense. Various projects have various requirements for RAM, program ROM and CPU speed. If you are making a commercial product and plan to buy many thousands of PICs, it is useful to make it run on the smallest, cheapest PIC that meets the needs. But for one-off projects, you can...
  13. BobK

    Please help !!

    Well, you have discovered a new phase of programming. It is called debugging. Read up on it and dig in. Bob
  14. BobK

    Help Getting Started with PIC Microcontrollers

    Yes, prices are higher but we are talking about $1 vs 2$ here. Unless you are producing a product and selling thousands, it might be worthwhile to go to the 16-bit PICs i.e. PIC24Fxxx or PIC33Fxxx These tend to have much larger memory and a better interrupt structure. The other downside is...
  15. BobK

    Help Getting Started with PIC Microcontrollers

    Go the the MPLAB X page, the on the left is a list of links. Click "Legacy Software". You can get any version of MPLAB ever made. I have not upgraded to PICKIT 3 yet, so I really don't know, I only know that many people complain about it on the Microchip forum. Assembly language uses the...
  16. BobK

    Help Getting Started with PIC Microcontrollers

    If you have no experience with C, I would recommend finding a tutorial and a free compiler and learn it on your PC first. There are plenty of resources on line. As far a PIC programming, I would recommend that you get a PICKIT 2 OR 3, and use the free C compilers from Microchip. I would...
  17. BobK

    Converting a business to LED lighting

    Thanks, Steve, I tried to respond a couple of times, but just could not stomach it. Bob
  18. BobK

    Mins from CR2032 @ 200mA?

    There are GPS devices you can place on a pet that will track them in real time. Bob
  19. BobK

    Converting a business to LED lighting

    That sounds pretty expensive when you can get 800 lumen A19 bulbs at Home Depot for $5 each. Bob
  20. BobK

    FET switch circuit - is it correct

    That should work okay. The resistance will be negligible compared to 10K so not effect on the readings. Bob
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