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  1. CDRIVE

    Chronograph for bullets

    Sound is a very poor measurement medium for firearms. Many varmint calibers are nearing muzzle velocities of MACH 2. On top of that the environment on a typical rifle range can sound like a Hatfield/McCoy skirmish.
  2. CDRIVE

    low fuel light circuit

    Here's an updated schematic and some plots that should answer your questions. R2 was replaced with a trimpot and R6 was added for safety. See notes! Chris
  3. CDRIVE

    low fuel light circuit

    You may opt to use a 10K pot in place of R2. This way you can play with the value with ease. When you find the trip point you like best you can then measure the pot and replace it with a fixed resistor.
  4. CDRIVE

    Digital Pot setup

    Justin, when your 12V battery is at full charge what is the unloaded voltage? Typically, lead-acid batteries (automobiles etc) are regulated @ 13.8V but can be a bit higher. I forget what type of bat you're using. I will probably be basing full charge at 14V. Chris
  5. CDRIVE

    Digital Pot setup

    Justin, we're going to be using ReadADC but not to read the your speed control output. It will be used to monitor your battery voltage. Chris
  6. CDRIVE

    Digital Pot setup

    Bob explained it but why do you want to do this? Chris
  7. CDRIVE

    Digital Pot setup

    On a single chip there's no reason to use 'ReadADC' because we have our 6 steps stored in B1. So making an LCD display "Stopped", "Low 1", "Low 2", "Medium", "High" and "Max" is just a matter of reading B1 and writing the Serial code. I'm glad you're experimenting and practicing on your own...
  8. CDRIVE

    Digital Pot setup

    Justin, I think the 18M2 may be a bit of overkill for this but I'll let you know. It's going to take me a bit of time to work up a new schematic and code. The schematic symbol of the 08M2 that I've been using was drawn by me because I didn't have one in my schematic editor. I'll have to create a...
  9. CDRIVE

    Chronograph for bullets

    Good grief man, you're in the Keys! You should be diving, fishing and drinking. Then more drinking, more diving and drinking. Hell, it's hot down here at this time of the year! :p
  10. CDRIVE

    Piezo buzzer at 20 hz

    I would suspect that if your purpose is to produce audio it's going to be quite feeble.
  11. CDRIVE

    Piezo buzzer at 20 hz

    The resonant frequency of a Piezo is many octaves higher than this, near 2KHz.
  12. CDRIVE

    Modifying headset

    Yes, I thought his arrangement was Headset------------------ long audio cable -------------------------USB Module -----------long USB cable----------------USB plug. More like a Laptop power pack arrangement where the cord is fairly long from the PC before it reaches the power pack. If it was...
  13. CDRIVE

    Modifying headset

    I thought I knew why you reversed my con/plug arrangement but after looking at this again it eludes me. If the plug is on the headset, as i had them, there would be no need for the extra male to male adapter to plug into the IPod, or am I still missing something? Chris...
  14. CDRIVE

    Display Battery Backup

    This is why I said a small automotive lamp will probably work fine.
  15. CDRIVE

    Modifying headset

    Oops, I see that I really didn't grasp what you wanted to do. I missed the IPod thing. Thanks to CocaCola for reversing my schematic. BTW, I don't see any need to disassemble the headset. CocaCola gave a good description of Red Neck ringing out of the cable, and that's all you need to do...
  16. CDRIVE

    Modifying headset

    First I want to say that prior to this thread I had no idea what 5.1 Audio was. I'm still not positive but what I read seems to indicate 6 channel audio. I have no idea if this schematic is accurate because the wire count from your headset photo seems to be off by one conductor as compared to...
  17. CDRIVE

    Digital Pot setup

    First question.. What's an "SSD"? Are you referring to the LCD? I'm not sure which LCD package Picaxe provided on your Protoboard but they sell 2 versions of LCDs. (1) Bare LCD that receives input data via (BCD) Binary Coded Decimal. This requires 6 inputs (6 Outputs from the Picaxe) 4...
  18. CDRIVE

    Modifying headset

    Don't run off just yet. I rarely abandon people. I've just re-read your original post and will make some suggestions later on. I had a rather large birthday meal, G&Ts too, and now I can barely breathe! :eek: Now where the heck did I put my cigarettes? :rolleyes:
  19. CDRIVE

    Display Battery Backup

    A small incandescent lamp, in place of the resistor, is usually better choice for this kind of application. As W.Dave said though, you'll need a Diode in series too. A Schottky Diode will minimize voltage drop.
  20. CDRIVE

    Modifying headset

    OK, what we need here is some input from members that are familiar with this technology. USB is a data port so, unless someone tells me differently, I have to assume that your headset receives raw data which is processed by an on board chip, which converts it and then outputs 4Ch audio. I also...
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