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  1. CDRIVE

    bipolar stepper motor to parallel port

    A search of Stepper Motor Control returns quite a number of hits. http://www.calibex.com/Stepper-Controller-Board/zzcalibex2zB1z0--search-html Chris Edit: Because of cheap and very effective USB/Serial Converters RS232 is going to be viable for many years to come. The same can't be said...
  2. CDRIVE

    component for Serial data

    You're pull-up resistor is 270Ω. It should have no problem driving the hi z inputs of multiple arduinos. If the runs were long then it would be a concern because we get into proper transmission line issues, signal reflection, etc. I don't think you'll experience any of this at the distances you...
  3. CDRIVE

    Microcontroller to iPhone interface

    There should be a special place for titles like this. :rolleyes: This is the message that's returned when typing "help help" into our search box. I selected 'Titles Only'. Chris
  4. CDRIVE

    differential op amp to measure current

    Not surprising that our friends at Maxim have developed a number of chips for high and low side current measurements. Spend some time reading through this and then download the data sheets. http://www.maximintegrated.com/app-notes/index.mvp/id/746 Chris
  5. CDRIVE

    Inductance and capacitance meter with AVR

    I have the Proteus-Isis lite version. Picaxe made a deal with them to support their chips. This is probably why Tina still has not provided live Sim with Picaxe chips but Tina does support a standard Pic for use in Interactive (live) mode. Tina links to the Pic code in much the same way as...
  6. CDRIVE

    Inductance and capacitance meter with AVR

    Kris, I believe that Proteus/Isis provides interactive mode simulation and imports the firmware from his code files. Chris
  7. CDRIVE

    looking to hire someone for a quick job

    That's why I inquired. We all know how most of these requests end. On the other hand, i don't want to put a bad mojo on this. ;) Chris
  8. CDRIVE

    Operation of BJT in the circuit

    That works for me. ;) Chris
  9. CDRIVE

    Operation of BJT in the circuit

    Ugh! How irritating! We need an animated smiley with two guys. One has a bat! Chris
  10. CDRIVE

    looking to hire someone for a quick job

    CC, hopefully the PMs will be an agreeable meeting of the minds and wallet, but if they don't please don't forget to share. Nosy Chris
  11. CDRIVE

    Operation of BJT in the circuit

    This is an odd thread. :rolleyes: Chris
  12. CDRIVE

    differential op amp to measure current

    Why did you start another thread with essentially the same topic? https://www.electronicspoint.com/differential-amplifier-badly-inaccurate-t253772-new-post.html Chris
  13. CDRIVE

    Controlling offset using VCR

    Google AD5228 data sheet. Chris
  14. CDRIVE

    Voltage Dependent Resistor

    If anyone interested in PSpice models for LittleFuse MOVs I found a bunch of them here... http://www.littelfuse.com/technical-resources/spice-models/varistor-spice-models.aspx It should be noted that some of the files on this page are mislabeled. Some are marked PSpice files but when you...
  15. CDRIVE

    Voltage Dependent Resistor

    Yes, this makes much more sense. Chris
  16. CDRIVE

    Voltage Dependent Resistor

    It should be obvious. Did you read the wiki link? When you read it don't skip over the degradation that can occur each time an MOV fires from an over voltage spike. Chris
  17. CDRIVE

    Help with reading schematic

    See, you've already learned a basic electronics law! ;).. So, are you going to buy the ebay kit? Chris
  18. CDRIVE

    LED to light when battery drops below 3.5V

    Probably because they're primarily designed to supervise uPs. Chris
  19. CDRIVE

    Voltage Dependent Resistor

    Here's a good description of how a Metal Oxide Varistor (MOV) works. Regardless of their particular ratings they all have one thing in common... They present a high resistance below their threshold voltage and a very low resistance above it. I've never seen an MOV used in series with the PS...
  20. CDRIVE

    LED to light when battery drops below 3.5V

    I guess Justin has nothing to loose by following your link. He'll probably be safe from salesmen, ...being in S. Wales. ;)
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