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  1. KrisBlueNZ

    Solenoid controller

    Hi there and welcome to Electronics Point :-) I'm sure we will be able to help, but you need to tell us the background on your project. So start from the beginning, tell us about the overall project, what you want to achieve, what parts you already have (or have chosen), and anything else that...
  2. KrisBlueNZ

    Please recommend books on building remote controlled models

    No worries. And please don't call us "sir". We are all just people, just like you. Apart from Ian, the administrator. You should call him Sir. :-) Sorry I can't answer your question. But I would start with an Amazon.com book search on remote controlled models.
  3. KrisBlueNZ

    Charlieplexing using the Arduino Uno?

    I assumed he wants to build a scrolling message display with a grid of LEDs. But reading it again, I really don't know what he means.
  4. KrisBlueNZ

    Please recommend books on building remote controlled models

    You mean remote controlled (RC) devices. I've fixed the thread title.
  5. KrisBlueNZ

    Chip45 Boot2 GUI, AVR Studio 4, MPLAB IDE, WinPic800, Tinyboot loader?

    I'm not familiar with any of those apart from MPLAB X, which is a program, not a device programmer (a device programmer is a physical piece of hardware). MPLAB X does drive several types of device programmer hardware though. Yes. A boot loader is a type of firmware. It's not the main firmware...
  6. KrisBlueNZ

    4-20mA using XTR111

    If you mean the circuit in post #8 on this thread, you can replace the two 120k resistors with a multi-turn 250k trimpot, and replace the 4k resistor with a multi-turn 5k or 10k trimpot, and they will adjust the zero and the span respectively, but each trimpot will also affect the other...
  7. KrisBlueNZ

    Jeopardy/Fastest finger

    Ah, stuff it. Here you go. Actually it's not a buzzer - as shown, it just illuminates lamps. But that's close enough! This is a pretty simple circuit using two relays. There are two normally open momentary pushbuttons, SW1 and SW2, for the two contestants, and two lamps (or beepers or...
  8. KrisBlueNZ

    Jeopardy/Fastest finger

    Did you try Googling fastest finger quiz buzzer? When I did, I got hundreds of hits. Use an image search to quickly find schematics. Look for something simple using relays, as GreenGiant suggested.
  9. KrisBlueNZ

    Please Design This PCB...

    Yeah. There seems to be an alternate reality out there. shilon, if you're still reading this: This forum, and others like it, exist to TEACH. We like to help people LEARN. "GIVE a man a fish and he eats for a day. TEACH a man HOW TO fish, and he eats for a lifetime." We are all volunteers...
  10. KrisBlueNZ

    Chip45 Boot2 GUI, AVR Studio 4, MPLAB IDE, WinPic800, Tinyboot loader?

    I would describe what you do as "flashing microcontrollers", "burning microcontrollers", "downloading code into microcontrollers" or "programming code into microcontrollers". A .hex file is a file that contains a representation of binary data in a specific format. This binary data usually...
  11. KrisBlueNZ

    Please Design This PCB...

    Sounds easy when you put it like that. Let me be clear. No one is going to design a PCB for free for you. (Except maybe a beginner whose work you can't trust.) If you want a proper job done, and few problems, hire a freelance electronic design engineer and expect to pay him well. If you want...
  12. KrisBlueNZ

    Please Design This PCB...

    Do you imagine that someone here will just happen to have a PCB design for that circuit already drawn up? What are you thinking?
  13. KrisBlueNZ

    Please Design This PCB...

    Are you joking? Some people here might be prepared to quote you for a job like that. You would probably get a poor job done for a lot less if you tried locally.
  14. KrisBlueNZ

    Half Bridge Inverter Design

    twenglish1, you'll need to fix your previous post. It may look OK to you but here's how it appears to me. You can upload your image directly to Electronics Point. Use the Upload a File button at the bottom of the post editor, and insert it into the body of your post using the Full Image...
  15. KrisBlueNZ

    Help programming an EEPROM (AT28C256)

    Great work! Sorry I didn't reply in time, but I guess you figured it out OK :-)
  16. KrisBlueNZ

    Dryer not spinning

    I would be really, really surprised if it wasn't possible to get into it. Even if it has been rivetted together, you should be able to drill out the rivets.
  17. KrisBlueNZ

    Polarities on Fuse Holder?

    I've seen both types, but in either case it's possible to put the replacement fuse into the holder first and that's where the danger lies. At least, that's how it seems to me. I haven't seen a fuseholder where the front contact can be touched by the user; it's only ever the back spring contact...
  18. KrisBlueNZ

    LED lighting without power source

    If there are no outside lights, perhaps the next time it's foggy, you could wait till the middle of the night and put a camera outside with sensitive film and leave its shutter open for a few minutes. Maybe you know someone who's into photography who would do it. You might get a pretty cool...
  19. KrisBlueNZ

    Microcontrollers use a Crystal Why?

    OK, done. Go ahead.
  20. KrisBlueNZ

    Polarities on Fuse Holder?

    Fuses and fuseholders aren't polarised, but as Ken said (though he got it the wrong way round), there may be a right way and a wrong way to wire it, if the fuse is connected in line with the mains (line) voltage or any dangerous voltage. If it is, connect the incoming voltage to the side...
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