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  1. CDRIVE

    Delay "off" Timer

    Hi Logan. Just in case you need it. The 10Ω can be >=1/4W and the caps should be rated 25 to 50VDC. Chris
  2. CDRIVE

    Delay "off" Timer

    If you have any questions don't hesitate to ask. We are very friendly here. BTW, what's your name? As you can see my Mom and Dad didn't name me CDRIVE. ;) Come to think of it no one has ever asked me where that handle came from. Chris
  3. CDRIVE

    Delay "off" Timer

    Yes and yes. You will also need to add 1000pF and .01uF to .1uF caps between the V+ lines and GND (close to the supply pins) of both chips. This is because the automotive environment is like shoving a chip up your colon! It's a nasty, inhospitable place for electronics!! In fact you may have to...
  4. CDRIVE

    78l33 circuit regulator, thought it would drop a 5v voltage to 3.3 v but no!

    The best way to get pertinent and useful information is to answer questions when they're asked. Chris
  5. CDRIVE

    Rest in Peace, Kris

    Adam I don't know how you obtained that image but thank you for sharing it. This thread will continue to pop up and It will continue to hurt. It's a good hurt though. I really don't want Kris to be forgotten. Chris
  6. CDRIVE

    Delay "off" Timer

    Yes, that's exactly what I'm talking about. I especially like the latch circuit. It prevents the circuit from drawing any current until S1 is depressed. Good job of searching! Chris
  7. CDRIVE

    Programable commutator

    Then that's where you will most probably find the hungriest prospects willing to work with a minimal budget. If your work involves non profit I would approach the instructor. He may see this as a viable team project. Chris
  8. CDRIVE

    Delay "off" Timer

    mbost, first off I forgot to welcome you to EP, so here it is... Welcome to Electronics Point! OK back to your project. The reason I said you can't milk 10 minutes out of a single 555 is because electrolytic caps leak. When using large values like your schematic has (1000uF) the timing will be...
  9. CDRIVE

    Delay "off" Timer

    You can't use a single 555 to create a delay of 10 minutes and no,... connecting pin7 to pin3 isn't going to make it more efficient. It will disable it! Chris
  10. CDRIVE

    special oscillator

    Yeah Bob, it almost sounds like one of those class projects that the instructor assigns using limited and specified components. Except these components don't make any sense! I think the 10 16MHz crystal oscillators trumps the 100 10K resistors though. An avid experimenter can logically eat up...
  11. CDRIVE

    78l33 circuit regulator, thought it would drop a 5v voltage to 3.3 v but no!

    What are your maximum current requirements? If it's low you may be better off using stacked diodes and resistor configured as a shunt regulator. A pass transistor can be used to boost current limits if needed. If you ask for a schematic of this I won't give you ASCII art. I hate it! Chris
  12. CDRIVE

    Delay "off" Timer

    Me too because it's difficult to build it yourself cheaper than you can get a loaded board (nice too!) from Ebay's China stores. http://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=time+delay+relay+board&_sacat=0...
  13. CDRIVE

    78l33 circuit regulator, thought it would drop a 5v voltage to 3.3 v but no!

    The ST datasheet does not list output regulation specs on inputs less than 5.3V. That said I think you have it wired wrong. Post clear photos of your circuit. Chris
  14. CDRIVE

    special oscillator

    Is this topic humorous in the way it was presented or is it just too much crappy weather by me that's had me spending far more time at my watering hole than I should? o_O Chris
  15. CDRIVE

    Need fundamental help understanding this circuit

    I liked CO's post but it should be worth mentioning that mag switches can be purchased that contain both N/O - Common - N/C contacts. In general electronics terminology this is equivalent to a Single Pole Double Throw (SPDT) switch. If you purchase one of these you can't go wrong regarding door...
  16. CDRIVE

    Programable commutator

    Gerard, I don't think it would be reliable, on my part, to answer that accurately. That question would vary dramatically just between States in the U.S. and possibly even geographic areas of the same State. It's also going to be vastly different when comparing old seasoned engineers vs. young...
  17. CDRIVE

    Anyone know how to change a song saved in this circuit

    My guess is those are in house manufacturers codes and won't be useful for tracking down the origin of that chip. Chris
  18. CDRIVE

    Rotor test

    Yes, it's unfortunate when we have to confirm what seems to be convincing evidence of a failed part that's expensive but it certainly appears to be as Kiwi said. Chris
  19. CDRIVE

    What fuse is this?

    Check with Digikey for a substitute. Perhaps a "Picofuse"? Chris
  20. CDRIVE

    Identify base, collector, and emitter of transistor

    Further sleuthing proved positive. Well not exactly. The truth is I was googling to see if there was a crossover between any Picaxe chips and the ATmega8, ATmega168 and ATmega328. I didn't get a positive hit in that regard but I did find an updated (V1.06k) version of the PDF. This PDF cleared...
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