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  1. CDRIVE

    Digital Pot setup

    Yup, Dave explained it. It's the 100nF caps that you purchased from Picaxe. C1 is used on the input pin of the 7805 (U2) 5V voltage regulator. It sees the full battery voltage. So it the batteries total 24V you want a cap rated at least 35V. Chris Edit: No, you shouldn't feel stupid. Thus...
  2. CDRIVE

    high voltage switch help

    What are you trying to build?
  3. CDRIVE

    Modifying headset

    Ah, there's the issue. Last night I spent nearly 45 minutes trying to garner 'accurate' information on this item. Today I've downloaded two pdf's that don't pertain to it. I haven't made it to first base helping you and I'm already frustrated and burnt out. :eek:
  4. CDRIVE

    Modifying headset

    I went to Zalman, pasted ZM-RS6F in the search box. Not found was returned. The closest model found is ZM-RS6F+M, which isn't USB. Post your pdf.
  5. CDRIVE

    Chronograph for bullets

    This is great! I simply love seeing how great minds solved complex physics long before electronics and computers. Chris
  6. CDRIVE

    Digital Pot setup

    I assume the brushless motor is desirable because Horses are skittish and brushless motors are much quieter? Also, if you use 24V battery make sure that C1 is rated for >=35V. Preferably >=50V. Chris
  7. CDRIVE

    Board Burnt

    I should have specified that the eraser trick pertains to un-tinned copper traces. Exposed to air they oxidize and will not take solder. The eraser cleans the oxidation without removing metal. It also works well on battery holder contacts, copper wire, and any electrical contact, connectors, etc...
  8. CDRIVE

    Chronograph for bullets

    I didn't want you to think that you're being ignored. I'm a hand loader and competitive shooter, so this interests me. I'm going to sleep on this but off hand I think there's got to be a much better way of doing this.
  9. CDRIVE

    Modifying headset

    What model number is it?
  10. CDRIVE

    Display Battery Backup

    This is an automobile?
  11. CDRIVE

    Board Burnt

    Contact cleaner will wash away loose carbon but the stubborn stuff will require a stiff brush, like a tooth brush. An eraser does a good job too, especially for cleaning a trace nice and bright to accept solder.
  12. CDRIVE

    Light Sensitive trigger

    What relay? There's no relay in your schematic. A Piezo buzzer is shown as the load.
  13. CDRIVE

    design and impliment class c radio frequency power amplifier

    When is this project due? Did your instructor specify,.. transistor, vacuum tube, wattage, etc?
  14. CDRIVE

    Digital Pot setup

    Justin, here's a complete view of your schematic. Take note that ground is common to all parts. I hope it clears things up. ;) Chris
  15. CDRIVE

    Digital Pot setup

    Justin, I just noticed that your controller operates from 20 to 50 Volts. Are you going to be using two 12V batteries wired in series? I thought this project was going to be powered by a 12V battery. To answer your question, everything will have a common ground. Chris Edit: Never mind...
  16. CDRIVE

    Digital Pot setup

    Justin, here's the updated code and schematic. It should do exactly what you want. By the way, you never asked why my first schematic switched pins 3 & 4 low while these last two were changed to switched high. I did this only because I wanted you to have less hassles using the simulator. When...
  17. CDRIVE

    low fuel light circuit

    You're welcome Paul. Keep us posted on your progress. BTW, U1 is a quad comparator (14 pin DIP) on a single chip. You'll be using only one of them. Perhaps one of our members know a single 8 pin DIP version? Also, U2 (7805) is a TO220 package. A 78L05 can replace it and is much smaller in a TO92...
  18. CDRIVE

    DC motor control

    Wow, the mention of Dynaco brought back memories. I believe it was the mid to late 50's when my Dad built his first Dynakit. The exact dates and time period are now foggy but after testing his work I do remember exactly what he said to me. "Son, this is off limits to you and your sisters", "If...
  19. CDRIVE

    Digital Pot setup

    Excellent info. Dunka! Chris
  20. CDRIVE

    Time for an old dog to learn new tricks!

    I think Texas Instruments are still offering Tina-TI. This is a stripped down version of Tina though. I also use LT Spice and it's really good freeware. It's not as easy to use as Tina and their schematic models take up a large amount of real estate. ;) Chris
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