Search results

Search Forums New Posts
  1. CDRIVE

    help with picaxe

    Nope, that's not what I meant. Chris
  2. CDRIVE

    OP AMP Wiring help please

    Ah, further proof that there's no need to accumulate feedback from multiple forums. There's more than enough expertise right here on EP! ;) As a side note and because I'm still in love with the old girl, I'd like to mention that to my knowledge the old HP410-B VTVM was the only VTVM produced...
  3. CDRIVE

    help with picaxe

    Ken, we've had many post regarding LED-PWM dimming. LEDs are too fast to take advantage of PWM directly without use of a pump charge scheme. He can take advantage of the 08M2's DAC output but that would also require a small filter cap and a HiZ input LED driver. Chris.
  4. CDRIVE

    help with picaxe

    This is mind boggling for me because the Picaxe PDF's are absolutely complete and provide sample code for EVERY command. The rest of the programming will follow all languages, meaning "logical structure". BTW: To fade an LED you're going to need an R*C circuit in conjunction with your 08M2...
  5. CDRIVE

    Photoelectric Switch (Triac) Doesn't Work With LED Lamps

    Steve, I think I do. I wasn't sure what you were describing but I got it now. The LDR / Cap circuit shunts the gate current when the LDR's resistance goes low, IE, sees light. Following your suggestion it would seem logical that if two or more (more would be preferable) LED lamp clusters were...
  6. CDRIVE

    Photoelectric Switch (Triac) Doesn't Work With LED Lamps

    Am I missing something here? PWM doesn't work with LEDs for the reasons we're all aware of. Why then would Triac phase slicing be any more effective? Chris EDIT: OOOPS! I see it's not a dimmer but rather an LDR switch. Regarding my questions: Never mind.. :o
  7. CDRIVE

    OP AMP Wiring help please

    Ah, I get it now. You have a moving coil (DeArsonaval) meter movement. Yes, a Voltage Follower in conjunction with a meter multiplier resistor should work. Chris EDIT: Actually, your schematic indicates a LED display, not a meter movement. A voltage follower would still work though.
  8. CDRIVE

    OP AMP Wiring help please

    I must say that your handle is apropos. I really don't understand what you're trying to do. Chris
  9. CDRIVE

    What is the purpose of the transfomer in this DC cicrcuit?

    The circuit appears to form an oscillator which drives the primary of transformer. High voltage AC is produced on the secondary where no connections are shown. There must be more to this circuit because the secondary voltage must be rectified and used to charge the strobe's discharge cap...
  10. CDRIVE

    astable multivibrator

    That's a difficult question to answer. Since he won't post the schematic everything suggested and hypothesized is pure guesswork. Chris
  11. CDRIVE

    1 Wire GM Alternator and Generator Light

    You're correct. In less than the time it took you to type these 5 paragraphs I found all the info I asked for... and then some. Chris
  12. CDRIVE

    1 Wire GM Alternator and Generator Light

    You've tweeked my curiosity. Do you have any links that include photos and schematics showing the two designs? Chris
  13. CDRIVE

    1 Wire GM Alternator and Generator Light

    You're welcome but just for the record I like Duke's idea but adding an additional diode to the alternator stator would probably be difficult to say the least. Are you sure that terminal doesn't exist? Chris
  14. CDRIVE

    1 Wire GM Alternator and Generator Light

    Prior to solid state automobile regulators employed a very basic design that took advantage of the hysteresis that electromechanical relays inherently possess. This simple circuit employs the same technique. How it works: EM relays have a Pull-in and Drop-out specification that relates to...
  15. CDRIVE

    Amplitude and Frequency

    Whoa, I missed that! ;) Chris
  16. CDRIVE

    Data sniffing from a RS232/485 network

    For a much cheaper alternative have a read through this article. It also contains a link to a free port monitor program that you would install on the sniffer PC. http://www.compuphase.com/electronics/rs232split.htm Some FYI: (1) The fact that your system is DOS based is irrelevant to the...
  17. CDRIVE

    Car Battery Bounce Eliminator

    If it's throwing sparks when everything is supposed to be off then I'm in the "There's something wrong" camp too. If you use a brake light in series with the positive battery cable and it doesn't go out in a few seconds then I'm sure there's something wrong. Chris
  18. CDRIVE

    Data sniffing from a RS232/485 network

    Assuming the OP has zero electronics aptitude and also considering that he is not in a home shop environment, I think he should be looking at a plug and play solution. It's a more practical solution for an industrial scenario. ;) http://www.fte.com/products/SerialAnalyzers.aspx Chris
  19. CDRIVE

    Data sniffing from a RS232/485 network

    I'm going to go out on a limb here by stating that I don't think Jan would ever advocate simply tapping into data lines without proper buffering / impedance matching. That cable should be treated as a transmission line. As with any transmission line,.. we simply don't "T" or "Y" them. Chris
  20. CDRIVE

    Data sniffing from a RS232/485 network

    Uh, she's a few years younger than me. https://www.google.com/search?q=jan+axelson&biw=1093&bih=494&tbm=isch&tbo=u&source=univ&sa=X&ei=FJaJUtbbBs6gkQeMhYDoDw&sqi=2&ved=0CEEQsAQ Her brain is a real turn on though! I think it's safe to say that female electronheads are as rare as hen's teeth...
Top