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  1. CDRIVE

    Activate transistor with piezo disc

    If the circuit is modified as you suggest: When pin3 is high the neg leg of C6 will be nearly at the same potential as V+ (9V) less the voltage drop (0.7V) of D1. Hence C6 will be close to 0V. When pin3 goes low C6 is charged to V+ - 0.7V of D1 = +8.3V. I still don't see any benefit here. You...
  2. CDRIVE

    Serial Port Monitor (Data Logger)

    You're welcome Adam. Just some notes here.. This is freeware and there's absolutely no help file downloaded with it. The Help button in the GUI is greyed out and clicking the help links at the website returns nothing. Fortunately, I hate reading directions anyway. So I was clicking and checking...
  3. CDRIVE

    Programable commutator

    Power MOSFETs are commonly used to do the work that relays once did. Considering that you're now talking about 240 outputs I'm wondering if a Stepper Motor connected to a 240 pole radial commutator would be more practical? Cheers, Chris
  4. CDRIVE

    Activate transistor with piezo disc

    The Out pin of a TLC555 is only a few 10ths of a volt lower than Vdd. So I don't see any benefit in that configuration. ...Perhaps I'm missing something? Cheers, Chris
  5. CDRIVE

    Drill bits for homemade PCBs?

    Sorry mates, the beard ain't gone but that old bugger has morphed. The beard is now kept close trimmed to match my trim weight of 170lbs,.. down from 165lbs when that head shot was taken. I played Santa Clause that year for my great nieces & nephews. Cheers, Chris
  6. CDRIVE

    Serial Port Monitor (Data Logger)

    I had to make a decision of what section of the forum I was going to post this in. The Resources section would have been a logical choice but I think only the Mods have access rights to it. So, I'm posting this very useful tool here in the Microcontroller section, as this is where it would find...
  7. CDRIVE

    Drill bits for homemade PCBs?

    Martin, you never cease to entertain me. For those that think that humor is the only thing you post... Not true! Occasionally you squeeeeze in a post, here and there, containing technical data! :p I like you! Chris
  8. CDRIVE

    LEDs Parallel or Series

    The 08M2 is the smallest Picaxe chip. Read the specs on their larger chips. They go up to 40 pins! http://www.picaxestore.com/index.php/en_gb/picaxe/picaxe-chips/picaxe-chips.html Cheers, Chris
  9. CDRIVE

    Can 7.4V 1900maH battery positive lead fry Raspberry Pi if attached to ground GPIO pin?

    Hey, since it was a total guess, 3 out of 4 ain't bad! :p Chris
  10. CDRIVE

    Can 7.4V 1900maH battery positive lead fry Raspberry Pi if attached to ground GPIO pin?

    Yes Harald, I agree. I just think that when experimenters use high current batteries it would also be wise to fuse them. Though I think current limiting supplies are the cat's meow when experimenting. In Steve's case (I'm not familiar with Raspberry) I thought he was referring (GPIO) to a...
  11. CDRIVE

    Can 7.4V 1900maH battery positive lead fry Raspberry Pi if attached to ground GPIO pin?

    Installing circuit protection is always a good idea. You can start by including a fuse in your circuit. Chris
  12. CDRIVE

    Drill bits for homemade PCBs?

    If you have a Horror Freight close by you can purchase some cheap backups. When these break you won't cry so much! 20 Pc Carbide Micro Bit Set Cheers, Chris
  13. CDRIVE

    Drill bits for homemade PCBs?

    We'll have to talk woodturning in our own thread sometime. Yes, I love it more than any other woodworking discipline. Cheers, Chris
  14. CDRIVE

    Drill bits for homemade PCBs?

    Ha! Mr.Ed. I love seeing him again on OTATV! He's smarter than Wilbur. I've also noticed that there are very, very few electronics heads that are not also amateur machinists and woodworkers. Check it out. You'll see that I'm spot on! I think it translates to .. Electronics Heads are arguably...
  15. CDRIVE

    Drill bits for homemade PCBs?

    Now that's scary! :eek: It's just that I've always felt very comfortable here at EP. Kinda like a big happy family. But then again families, even though they love each other, do fight now and then. So, that said. IMHO, drilling fiberglass PCBs should be done at high rpm at ~10,000 RPM with...
  16. CDRIVE

    Drill bits for homemade PCBs?

    Uhhh, I was going to post my two cents but when I see friends snapping at each other I think it best that I pass on this one. I see nuuuthing! I hear nuuuth-ing! I Know nuuuu-thing!:D Chris
  17. CDRIVE

    Help making a CRT oscilloscope

    Well, I totally agree with Old Steve. You do very neat work! I think you have a bright future! ;) RE CRT scarcity: If the Chinese think there's a buck to be made they'll manufacture them by the millions and list them on Ebay! And as resourceful as they are I actually think they'll find a way...
  18. CDRIVE

    Activate transistor with piezo disc

    That's funny because I too googled it as soon as i posted that but I didn't score like you did. Good job! ;) Chris
  19. CDRIVE

    Help making a CRT oscilloscope

    I LIKE THAT! :) Chris
  20. CDRIVE

    Activate transistor with piezo disc

    Yes Martin but that's only because it's the way I was taught. Admittedly, Vacuum Tubes were in vogue at the time. E = Electromotive Force. Though, I don't think I ever knew how "I" translated to ("A") current. When I'm bored I'll Google it. :) Cheers, Chris
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