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  1. CDRIVE

    Help with Jumbotron

    I didn't see anything in the data sheet that even hinted that all three LEDs are matched. So each LED requires it's own dedicated limiting resistor. I mention this because parallel wiring will take up more real estate because of this. Chris
  2. CDRIVE

    Variable power supply for supplying valve amp builds

    Resistive voltage dividers have limited applications. They're fine for circuits that draw minimal current but that's about it. Chris
  3. CDRIVE

    Electromagnet and Quarters

    Menicus, what's your backup plan? Vacuum would be a viable option. What's this for? Chris
  4. CDRIVE

    Electromagnet and Quarters

    Roger that! I just tested some U.S. coins. Under the plating they appear to be all Zinc and not magnetic. This means that his electromagnet will have to have a core material made of 100% Unobtainium! :p Chris
  5. CDRIVE

    How to address a moderator

    Have any of you have ever seen the 70's camp movie "Flesh Gordon"? It ran in theaters as a double feature along side "The Groove Tube". The Emperor Ming had a giant, gay, cyclops, henchman that had unique, if not unorthodox ways of addressing his Emperor! :D By the way, at that time Flesh Gordon...
  6. CDRIVE

    programming about motor..

    If running and stopping a single motor is all you're going to do then that chip is way overkill. If you're new to uC's and programming I highly recommend Picaxe. Their 08M2 (8 pin DIP) will drive your relay coil to control your motor. The language follows Basic syntax and is fully documented in...
  7. CDRIVE

    Electromagnet and Quarters

    Do you have any 12VDC relays hanging around? It'll save you a bunch of work. Just remove the contacts mechanism. Chris
  8. CDRIVE

    beer robot motor selection

    I also concur. I think it's a consensus. Chris
  9. CDRIVE

    Are these designs realistic for my setup?

    This question is impossible to answer without knowing the skill level of the OP, both electrically and mechanically. Chris Edit: I have a long lifetime of experience in both but I don't think I've got what it takes to build this into a sneaker. Well, maybe a really, really big sneaker! :p
  10. CDRIVE

    Electromagnet and Quarters

    I really don't understand this part of your question. Also, do Canadian coins contain ferrous metal? In the old days there was no ferrous metal in U.S. coins. They were literally worth their weight in precious and semiprecious metal. None of which was ferrous. I'm sure Canadian coins followed...
  11. CDRIVE

    Woo-Woo Power saving speculation

    Here are five examples applicable to the definition of "Logic". I contend that attempting to find logic in the OP's posts would be ..... illogical! :p Chris
  12. CDRIVE

    Simple Variable DC Power Supply

    But I can't jump. Fortunately it's not one of my lifetime goals. :p You're welcome. By the way I modified it a tad to make the connections in both plugs more clear. I also added a few notes. Chris
  13. CDRIVE

    Simple Variable DC Power Supply

    I don't know where you are on this project but here's a pictorial of Steve's circuit. My library had very few 3D or line drawing models so I had to draw most of what you see. You owe me your first born! Chris
  14. CDRIVE

    HUGE NOOB, need help please!

    Since you're not using a limiting resistor your circuit should look like FIG A. Normally we use a current limiting resistor in series with the LED, as shown in FIG B. Personally, I would still like to see one in there even if its only 1 to 2.7 Ohms. Chris
  15. CDRIVE

    HUGE NOOB, need help please!

    I'm still confused. If the switch is wired across the cells then the switch would short the Cells and the LED when the switch is closed and the LED would turn off. The cells would get hot only when the switch is closed. You said that the LED lights whether the switch is on or off. :confused...
  16. CDRIVE

    HUGE NOOB, need help please!

    This makes no sense at all. Especially since this is such a rudimentary circuit. Schematic or good photos... Your choice. Chris
  17. CDRIVE

    Power Supply?

    Greg, please forgive me. The way I said that clearly lacked even a modicum of tact. :o Chris
  18. CDRIVE

    Power Supply?

    Bad advice. You don't hang a 470uF cap on the output pin of a 78xx regulator. Chris
  19. CDRIVE

    Woo-Woo Power saving speculation

    Judge what? He and I have something in common. Neither he nor I know what the hell he's talking about. It's scary that you think you do! :eek: Are you fluent in babble? :rolleyes: Chris
  20. CDRIVE

    Fun with solenoids

    We're not saying that a solenoid won't work. It's your long stroke requirements that's the issue. If you can find one to fit your needs you may find the current requirements to be more than you expected. You should also be aware that the pull force of solenoids are not constant. They have much...
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