Search results

Search Forums New Posts
  1. CDRIVE

    Help needed (Solar Lamp Circuit)

    I forgot to mention that your title had me expecting something else. I thought it was a Solar Oven or grill! :p Chris
  2. CDRIVE

    Help needed (Solar Lamp Circuit)

    NiCd, NiMH, else? Chris
  3. CDRIVE

    Flashing 5watt led?

    Your choices are increase the pulse width or increase the LED current or both. Doubling the value of R5 to 20K will double the pulse width. To actually be able to discern the difference in brilliance will require two 10Ks in series for testing purposes. Using jumpers jump out either 10K and...
  4. CDRIVE

    Water Detector Circuit W/Relay

    Sometimes I post a schematic and spot an error or maybe a note that I failed to include on the schematic. In those cases I hustle by butt to remove, amend, append and re-attach the schematic within about a minute or two of my original post. Sometimes I even beat EP's 'Edited' tag. However, once...
  5. CDRIVE

    Yamaha HS -80m Powered Speaker

    Were you sure to observe polarity when you replaced the caps? Chris
  6. CDRIVE

    9 volt wall wort cleanup

    You're welcome. Chris
  7. CDRIVE

    9 volt wall wort cleanup

    That should work fine. Chris
  8. CDRIVE

    9 volt wall wort cleanup

    Hang a 500uF cap across the output of the wallwart. Make sure you observe polarity. Chris
  9. CDRIVE

    aquarium lighting upgrade

    Is there a question in there? Chris
  10. CDRIVE

    Water Detector Circuit W/Relay

    Your circuit can't possibly work as shown. The switch contacts that you show (that is actually a water conductivity path) is not wired where it should be. It must be from the + supply to the Base. The Beta of the NPN is also a factor. What's the pull-in current of the relay? Chris Note...
  11. CDRIVE

    multiple leds off one resistor

    You can run the LEDs with one resistor if you place the LEDs in series without exceeding the sum of each LED's Vf >= the supply voltage.. Chris
  12. CDRIVE

    Flashing 5watt led?

    There are 19 pages in this thread. While this topic is fresh in your mind it certainly is not in mine. I don't remember what the maximum current spec of your LED is. I also don't remember the specifics of how I arrived at a 10mS pulse width. I believe that it was determined that the human eye...
  13. CDRIVE

    Sensor Project for Airplane Product

    Ha, when I re-read what we've posted it does resemble dinner time at the Piranha's! :D Chris
  14. CDRIVE

    Glow Baton Repair

    You can try liberally scrubbing the board with rubbing alcohol using a tooth brush. I've also used mineral spirits successfully. Chris
  15. CDRIVE

    Help bluing razor blade

    Commander dietermoreno this is ground control again. Please be advised that we're aborting your reentry into earth's atmosphere. Mission control has requested that you set course for the Sun to take temperature readings. Please bring along your guitar. Ground Control over and out.
  16. CDRIVE

    Turbine to 12 V battery to USB port

    What you're describing is not charging anything via USB. Just because a cell phone uses a USB type connector to charge it doesn't make the charging source a USB source. Restated: A USB jack, plug, cable does not a USB make. Yes, I'm being picky about terms. :D Chris
  17. CDRIVE

    Help with simple project

    Steve, thanks for clearing that up for me. Honestly, I saw nothing in the image of that LED that would have clued me in. ;) Chris
  18. CDRIVE

    Help with simple project

    While others are focusing on the particulars of running vs, brake lights I'm still stuck on the specs of this LED. It can't be a single LED (9V-12V) unless it employs a constant current circuit or limiting resistors, which I don't see in this photo. I know of no bare LED with Vf=10V. Is this an...
  19. CDRIVE

    Thyristor diagrams in wrong place or not?

    This is a simplified schematic so there's no charging supply shown for the cap. That said the polarity of that cap is backward. http://1.bp.blogspot.com/-bzPU8q3z7qE/UEzPPr22E_I/AAAAAAAAA7Q/53roDwchJnI/s1600/CoilgunTestcircuit.jpg Chris
  20. CDRIVE

    Help with simple project

    Before we can provide accurate information we need to see the Data Sheet for the LED module. Chris
Top