Search results

Search Forums New Posts
  1. CDRIVE

    Digital Pot setup

    Justin, here's some useful free software for ya. http://www.tina-ti.software.informer.com/ http://www.ti.com/tool/tina-ti http://www.filerex.com/get/windows/education/science/ltspice_iv.html Chris PS, Your wife is really going to hate me! :D
  2. CDRIVE

    Digital Pot setup

    It's a pity that you smoked one of those chips because I posted that yesterday, before you purchased them. Chris
  3. CDRIVE

    Digital Pot setup

    What? :confused: I already gave you one here! https://www.electronicspoint.com/digital-pot-setup-t248126p17.html#post1472431 Chris
  4. CDRIVE

    Digital Pot setup

    Yes, I believe so. Chris
  5. CDRIVE

    Digital Pot setup

    Here's a way to overcome the issues I mentioned in my last post, This circuit uses two small 9V batteries and is independent of your 12V battery, It also draws so little that the batteries should last over a year or more if an off switch is provided when not in use.. Chris Edit: Another...
  6. CDRIVE

    Chronograph for bullets

    I thought this was mentioned earlier. The counter in mS starts when the projectile breaks the first beam and stopped when it breaks the second beam, If the second beam is placed 1 foot behind the first one you can convert it to a direct Ft/sec reading.
  7. CDRIVE

    Digital Pot setup

    Justin, I checked out the data sheet on the LM358 that Bob recommended. It's not a bad choice for the following reasons. (1) Output can swing down to near GND potential (+1mV). (2) Output can swing up to the positive rail, minus 1.5V. However, Since you only have a 12.5V source (when...
  8. CDRIVE

    Digital Pot setup

    The LM741 is not a single ended OpAmp. It requires a + & - 12V supply. Chris
  9. CDRIVE

    Digital Pot setup

    You're going to want a single ended (single supply voltage) opamp. The OPA134 is a low noise, wide bandwidth amp that should work well. It's also an excellent choice for very low signals like microphones. Even the old and very common LM224 or LM324 will work fine in your application. They're all...
  10. CDRIVE

    Digital Pot setup

    As already stated, an OpAmp with a gain of 2 (easy to do) is what you'll need. Here's the divider you asked for earlier. Run my app to get a direct 'b' value for the ReadAdc. Chris
  11. CDRIVE

    Digital Pot setup

    I wrote that app back in 2008 before senility started rearing its ugly head. I forgot that I had it! I've been up on the Picaxe website getting a thorough explanation of it. That's when I discovered that I totally understood it 4 years ago!!! :eek: Dividing your battery voltage down for...
  12. CDRIVE

    Digital Pot setup

    Justin, you may find this attachment useful and very easy to use. It's very handy when using ReadAdc and related code. Chris
  13. CDRIVE

    Digital Pot setup

    Justin, tell your bride that she should feel blessed. After all, she could be married to a brain dead jock. Instead, you're exercising your dendrites and expanding your mind. We live in an intensely high tech world but 99.99% of the world's population are just drones. They use this technology...
  14. CDRIVE

    Digital Pot setup

    No, I downloaded the new Picaxe M2 parts software after you did, so I've been reading through the new manuals. I just want to be certain that information that I give you (or anyone else) is current and correct. Some of what's been posted doesn't sound correct to me, so I'm verifying. Chris
  15. CDRIVE

    Digital Pot setup

    Regarding this statement and the stuff I snipped: I totally agree!. ;) BTW, because I'm so stuck on Tina, who, as I said, doesn't supply Picaxe models yet, I've been reading up on blank PICs, PicBasic and .ASM files, which Tina does support. Though I still wouldn't recommend them for Justin at...
  16. CDRIVE

    Digital Pot setup

    Justin, regarding use of the ADC to monitor your battery voltage: What is your familiarity with 'Ohms Law'? Ohms Law is ground zero for all the building blocks of electron theory and design. Understanding and mastering it is essential and one of the first things covered in basic electronics...
  17. CDRIVE

    Digital Pot setup

    Justin, as it turns out there may be more life left in the old girl after all. When my laptop shut itself down yesterday I was simulating the code found here.. http://www.picaxe.com/docs/frm010.pdf I had put the simulator in 'Break' mode while I was reading the pdf data on this chip. I...
  18. CDRIVE

    Digital Pot setup

    Justin, this is just to warn you that my laptop may be on it's last leg over here. I just hope that I get another PC and transfer all my stuff before it gives up the ghost. I do all my computing in my screen room. No matter how hot it gets at this time of the year I can't stand being trapped...
  19. CDRIVE

    Piezo buzzer at 20 hz

    Ha, I forgot about that thread and it was just a few weeks ago! ;)
  20. CDRIVE

    Digital Pot setup

    Justin, thanks for making the measurments. CocaCola, thanks for confirming it. Chris
Top