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  1. CDRIVE

    Variable power supply

    Have you considered PWM? It would be far more efficient. Heck, you don't even need DC to heat a wire. So a TRIAC controlled AC supply should work fine. They're simple too! ;) Chris
  2. CDRIVE

    The Ultimate Transistor Amplifier

    Other than the fact that it's solid state I see no difference in this basic design than commonly used with tube amps dating back <1940's. It's a textbook Push-Pull amp. As Fish stated they were typically class AB. Chris
  3. CDRIVE

    Why I want my old world back!

    That's some great tips but I'll have to get a federal ID card for that. You know.. one of those 'American With Disability' cards. Should be easy though. After all they hand them out as easily as the disabled tags for handicapped parking! I've seen teens with those. They sprint across the...
  4. CDRIVE

    Why I want my old world back!

    Here's another classic example of why my old world was so much better than this one. .. Yesterday the wife and I were leaving the parking lot of a nature center that we cycle to nearly every day. As we're hooking around the rear of the parking area I see two park ranger cars entering from the...
  5. CDRIVE

    Where is Electronics Point based?

    Harald, is there a benefit to having it based in the U.S.? Chris Edit: Never mind. It pays to read the link you posted.;)
  6. CDRIVE

    programming about motor..

    It's been about two months (prior to your post) since ikram1991 replied. ikram1991 only asked to run a motor for a few seconds. This simple (Picaxe Basic) code will run a motor for 3 seconds after a switch is pressed and released. If the switch remains closed the motor will run continuously. He...
  7. CDRIVE

    Uln2003 Stepper motor controller help

    Josh, the first thing you want to do is garner an understanding of the LPT and how to communicate with it. I did a search for you and was fortunate to hit on this page first. http://www.aaroncake.net/electronics/qblpt.htm Quick Basic runs in DOS. Perhaps Fish can give you some pointers on...
  8. CDRIVE

    Uln2003 Stepper motor controller help

    That's good. What's the OS on the PC? Chris
  9. CDRIVE

    Uln2003 Stepper motor controller help

    That will do fine. Do you have a protoboard? Chris
  10. CDRIVE

    Uln2003 Stepper motor controller help

    Let us know when you receive your board. In the interim you need something to occupy your mind. Perhaps you should spend some time learning how to communicate with the printer port. Do you have a bunch of LEDs and 470 Ohm to 1KOhm resistors on hand? Chris
  11. CDRIVE

    Lithium-ion batteries safe to play with?

    I don't think that batteries that still have useful life left to give should be discarded at all. Especially if they're not "environmentally friendly". I'm not a Litho expert but I don't see why we can't provide a regulator circuit for him. Chris ..3,223 miles and still...
  12. CDRIVE

    Uln2003 Stepper motor controller help

    Are you saying that you received the board? If so is this the only info that was supplied with it? Chris
  13. CDRIVE

    Looking for ACTUATOR / CONTROLLER suggestions.

    Fish, Archimedes was a great mind. ;) Chris
  14. CDRIVE

    Lithium-ion batteries safe to play with?

    Steve, is there a word missing ? :confused: Chris
  15. CDRIVE

    Voltage regulator problem

    Does that surprise me? I had a gut feeling that Steve saw it somewhere but old eagle eye on this end missed it. Thanks! Chris
  16. CDRIVE

    Uln2003 Stepper motor controller help

    Then it's a printer (LPT) port. Chris
  17. CDRIVE

    Voltage regulator problem

    Sorry for double posting but I wanted to be sure this wasn't missed, so I elected to not edit my last post. If the heater element resistance is not linear and can be plotted R vs. Temperature we can probably dispense with a Thermistor or other sensing device. We could then monitor current to...
  18. CDRIVE

    Voltage regulator problem

    Actually no. The odds are and if you're alone in RS with the salesman you will be the only person in the store that has even the vaguest idea of what you're talking about. :rolleyes: Steve, did you extract that from the ebay link? I didn't see it. Brian, here's a good example of why you...
  19. CDRIVE

    Uln2003 Stepper motor controller help

    LPT is an old term for a printer port. The DB25 was used for both Serial and LPT. If it's on a PC and it's Female it's a Printer Port. If it's Male then it's a Serial Port. Most PC's dropped the DB25 for Serial Port use in favor of the DB9 many years ago. Chris
  20. CDRIVE

    Voltage regulator problem

    Well, if everyone knew everything Electronics Point would be ... uh... pointless! :D Damn, that's a good pun! I'll just have to remember not to use it again. Moving a circuit from a Protoboard to a PC board is most easily accomplished by using Stripboard that can be purchased at Radio...
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