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  1. CDRIVE

    Ohm's Law or not Ohm's Law... That is the question

    After Bob's last post I did a search "AC Ohms Law Origins". I was hoping to attribute a name in connection with Z concepts. According to Wiki, It seems to fall under Maxwell's Equations. For Inductors and Capacitors, they are but 90° out of phase. As for the other components listed In...
  2. CDRIVE

    Please help me with a project!

    Just don't let that head get too big. You may want to take precautions. If you can't find a belt that size.. duct tape is OK in a pinch. :p Congrats! Chris
  3. CDRIVE

    Please help me with a project!

    Steve, thanks for doing that but it needs it's own title. You did provide a direct link to Kris's post but how else are we to add to the nominations if doesn't have its own thread? Chris
  4. CDRIVE

    Sweat monitor using electrodes.

    Oops! That's gotta suck! You weren't fast enough on that one Justin. Ahhh the well water talk'n. :rolleyes: Chris
  5. CDRIVE

    Sweat monitor using electrodes.

    I'm not sure what "FM" is. Frequency Modulation? Maybe a better question would be,,Do I really want to know? Anyway, Based on the 5V supply rails, minus about a volt and knowing your total expected gain, calculate what VG output levels you need to eliminate the clipping. Chris
  6. CDRIVE

    Ohm's Law or not Ohm's Law... That is the question

    There were 56 posts prior to yours. Are you saying you didn't read them? If so, that would be a pity. Though I strongly believe that Reactive Ohms Law does apply I wouldn't trivialize any of the arguments to the contrary thus far. To paraphrase davelectronic, ..."Dispite its rather bumpy start...
  7. CDRIVE

    Sweat monitor using electrodes.

    Oh, I see what you're saying. I was so frustrated from all the bouncing around that I hadn't read Justin's post completely. ;). I don't imagine that the Oxicodone and Roboxin is making me any sharper either. Last week I would have begged someone to shoot the Elephant on my shoulders. I'm...
  8. CDRIVE

    Sweat monitor using electrodes.

    That doesn't surprise me at all. It's far easier to generate harmonics from a distorted signal or when mixing a signal or signals that are distorted prior to being mixed. Chris
  9. CDRIVE

    Sweat monitor using electrodes.

    I was hoping Justin would ascertain that on his own. As for the filter requirements, I'm not as sure as you are. The human body picks up copious amounts of mains frequency hum. Maybe a notch filter would be apropos? Chris
  10. CDRIVE

    Sweat monitor using electrodes.

    By this reply I thought you understood. You obviously don't. In the first circuit you were clipping, so your cure for that is to add more OpAmps, more VGs, more complexity?? WTF!? :rolleyes: Justin this is what I was going to post yesterday but snipped it because it sounded nasty. Sorry...
  11. CDRIVE

    Please help me with a project!

    Nominated The Most Clever Circuit Award There's no doubt about that but a uC can't come close to the charm of your circuit. Did you pull the Q1 & Q2 design from something else you designed previously? I ask because the OP posted this only yesterday!! If we had a 'Most Clever Circuit...
  12. CDRIVE

    Please help me with a project!

    Why should we have to hunt them down? Post a link. Chris
  13. CDRIVE

    Sweat monitor using electrodes.

    Yes, I saw that also but it's not why he's not getting a voltage gain of 20 in his sim. Chris
  14. CDRIVE

    Sweat monitor using electrodes.

    Justin, I just wrote a 5 paragraph explanation but then deleted it in exchange for this. You're clipping! Chris
  15. CDRIVE

    Sweat monitor using electrodes.

    There's not much point in having a differential amp for the second stage. Chris
  16. CDRIVE

    Problems substituting a relay

    No, it can't. Give it a shot. Chris
  17. CDRIVE

    Problems substituting a relay

    I know this is going to sound weird, possibly impossible to you but if you doubled the value of R1 to 200R there would be barely any current reduction yet it would dissipate about twice the wattage. As I said and Kris confirmed, C1 is the primary current limiter in this circuit. I tunneled...
  18. CDRIVE

    Problems substituting a relay

    The primary conduit for this current is the 2.2uF cap. Chris
  19. CDRIVE

    Ohm's Law or not Ohm's Law... That is the question

    In that case please see below for a name regarding the subject. Chris ?
  20. CDRIVE

    Sweat monitor using electrodes.

    So I guess attaching the sensor the genitalia is out too?:rolleyes: FYI, paleontologists believe horses once had toes. Chris
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