Member Since: February 7, 2010

Country: United States

  • This kit is being sold for $9.95 while the MAX7219CNG (included in this kit) ALONE is being sold for the same price in the related products... How can this kit cost so little?

  • You could use this to make a touch screen! It would be challenging to make a fairly linear one. Make a very even rectangular patch of this stuff with wires connected to all four sides. Apply voltage from left to right and measure voltage with a conductive stylus (this would be your X-position ratio). Then switch to applying a voltage from bottom to top and read the Y-position. Not terribly useful, but fun!

    You could also make your own custom potentiometers and thus position sensors o__O

  • These are made by a company called LED Dynamics in my hometown. They have other, more flexible, current drivers that are capable of being PCB or breadboard mounted with both potentiometer or PWM output current adjustment. There is a limit on how fast you can switch the modules control line, however. IIRC, it was in the microseconds range. SF should carry the Buck-Puck LED drivers for people that want 3x the power and adjustable outputs. Maybe they already do, but I didn't notice.

  • What is the clock frequency of this setup?

  • When are you expecting this product to be back in stock?

  • I'm wondering if this can be used as an external oscillator for a uC. My application requires an accurate timebase, won't experience any significant temperature fluctuations, and will undergo MASSIVE accelerations (too great for quarts crystals to survive). I don't have any clue as to how uC's run crystals so I'm not sure how this would work...

  • Does anyone know if it is possible to change the range on these? +/-2000g range probably won't be accurate enough for my purpose. I do however like having all xyz on one chip. Space on my board is at a premium!

  • The datasheet suggests using high value resistors in this configuration.

    If the MSx pins are pulled up to VDD, it is good practice to use a
    high value pull-up resistor in order to limit current to these pins,
    should an overvoltage event occur.

  • This class of high power LEDs is usually sold on an aluminum PCB in order to dissipate the heat properly.. On an aluminum PCB the LED can be operated at 350mA "safely". By this I mean the LED will be fine, but you won't want to touch the aluminum with bare skin.
    If one desires to run the LED at full power (700mA), the aluminum PCB would need to be mounted to an appropriate heat sink.
    I would be weary of this much power dissipation on standard PCB materials.

  • This thing is loud. Sounds like a power drill or something. Also, does anyone else have a nice flat screen TV waiting to get smacked with a can of beer? Pretty neat otherwise.