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  1. CDRIVE

    Advice on LCD display for Picaxe project.

    I forgot to post this. It's found on page 36 which discribes direct parallel connection from the Picaxe to the LCD. Serial isn't used for this connection. EEPROM 0,(“Hellothere!”) ‘ store the text in the EEPROM memory gosub init ‘ initialise LCD main: let b1 = 1 ‘ set b1 to ‘clear display’...
  2. CDRIVE

    Advice on LCD display for Picaxe project.

    This is humorous. When reading that PDF there's a large note that states "For full datasheet please see www.picaxe.com/docs/axe003.pdf". Which is exactly the document your reading! :) I guess that could be handy when a year later you're wondering where you downloaded it from. :D Anyway...
  3. CDRIVE

    Switching leds

    I drew this up to help clarify my last reply. The Gate circuitry of TR1 does not follow your schematic exactly though. Instead I've placed a timed switch (SW1) on the gate to turn TR1 On and OFF. As you can see from the current and voltage plots, the voltage in question (VM1) can never reach 12V...
  4. CDRIVE

    Switching leds

    It's good news that you're still young enough to do that. I vaguely remember those days! I couldn't resist it. It only required a space between "a" and "broad".:) R14 feeds the input side (LED) of an OptoIsolator through (D8) Diode. While TR1 is off the voltage at the junction of R14 and D8...
  5. CDRIVE

    Trying to make a transistor cancel another transistor

    Thanks for the PDF. It's a lot of reading but quite informative. I also peeked at the LMT85 datasheet. Wow! The temp curve from -50 degC to 150 degC is damn near a straight line! Chris
  6. CDRIVE

    Need help with a circuit

    Did you miss this? Chris
  7. CDRIVE

    Trying to make a transistor cancel another transistor

    That would be post 51 Hop. Yes, I did parrot you when I posted that misspeak but since Constantine didn't catch it when you said it I took the heat solo. ... You owe me for not snitching. :) Chris
  8. CDRIVE

    Need help with a circuit

    Yes, that's why I corrected myself. "CYA"! :p Chris
  9. CDRIVE

    Capacitor charging

    If that was a scope measurement it would be meaningful. With a DVM?..... Eh, not so much! Chris
  10. CDRIVE

    Capacitor charging

    Yes, old and understood by very few. That's it's charm! Chris
  11. CDRIVE

    Capacitor charging

    I think we're having a Struther Martin moment. It wasn't suggested to replace the 1000uf cap for operational use. The ceramic cap is only to test the PS using no load but a 10MΩ DVM. This way electrolytic leakage as the culprit can be eliminated. Doesn't matter though because I think Steve...
  12. CDRIVE

    Need help with a circuit

    If it is cycling correctly ON - OFF while the Arduino is running then it's unlikely that you need to change your code. Not from the description above, that is. Just change your wiring to the Normally Open (N/O) contacts of the relay. Chris Edit: I just noted that your ON - OFF times aren't...
  13. CDRIVE

    Capacitor charging

    Mark, in amateur radio what you just did would be considered an echo. His name is Ed. "73's de Ed" means "Best regards (73's) from (de) Ed". So you're post should read "73's de Mark". ;) It was born when (Morse Code) ruled. Chris
  14. CDRIVE

    Need help with a circuit

    If the fan is still running when the arduino is powered down then you have the fans connected to the normally (NC) closed relay contacts. Chris
  15. CDRIVE

    Trying to make a transistor cancel another transistor

    Touche! Can I claim that Spell Check confused "linear" with "analog"? :rolleyes: Chris
  16. CDRIVE

    Help with sensing a stopped sprocket

    "No Soup for you! ... One year". :p Chris
  17. CDRIVE

    N Channel JFET Testing in ESR Tester

    I found this during a Google search. http://socrates.berkeley.edu/~phylabs/bsc/PDFFiles/bsc4.pdf It's from Berkeley, so it's quite thorough. Though I'm surprised that within this document I didn't see any reference to the Drain / Source ambiguity encountered when determining the pin-out of...
  18. CDRIVE

    Trying to make a transistor cancel another transistor

    If Dave is going make that monumental leap to micro's I'd advise him to go Picaxe! Every aspect of the Picaxe system, initial cost, programming hardware, chip cost vs arduino, learning curve and support will be the most painless. That said, it's complete nonsense to make a giant leap like that...
  19. CDRIVE

    Capacitor charging

    I'm afraid I'll have to disagree. It's not irrelevant if the cap leaks faster than the supply can charge it. That said the point would seem moot since Steve seems to have read between the lines...... https://www.electronicspoint.com/threads/capacitor-charging.280653/#post-1708062 Chris
  20. CDRIVE

    Trying to make a transistor cancel another transistor

    That's why I like Tina. Finding parts and drawing schematics is fast. Very fast! Chris
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