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ericjforman

Member Since: April 12, 2007

Country: United States

  • Product TOL-11789 | about 3 months ago

    What kind of flux is best for extending paste life?

  • Product TOL-11789 | about 3 months ago

    I also got JLY-538. Unable to find any info online.

  • Tutorial - Digital Caliper Battery Hack | about 2 years ago

    This is a great guide to putting a cap in the battery compartment to ensure accurate performance: http://www.robotroom.com/CaliperCapacitor.html.

    Also worth noting when buying button cell batteries: LR44 is NOT equivalent to SR44 (aka 357). SR44 are silver oxide and last way longer than alkaline LR44 in caliper’s crappy so-called standby state.

    But I agree with phil & 333257 that disconnecting battery is the optimal solution.

  • Product COM-00100 | about 2 years ago

    Update: I had previously reported success operating this relay at 5V directly from Arduino digital out. I finally measured its coil resistance, it is 57 ohms, therefore it should need 88mA @ 5V to turn on consistently. However, I can confirm again that it works fine without a transistor, and I measure 55mA going through coil directly from Arduino pin. Since max (for Uno) is supposedly 40mA, not sure how this is happening, but it works. :-)

  • Product COM-00100 | about 2 years ago

    Here is new URL - but it doesn’t show coil info, and still has different item photograph showing 12V instead of 5V.

  • Product COM-00105 | about 2 years ago

    i ordered many of these for my class and i confirm about 1 out of 10 have defective red elements. SparkFun should replace yours.

  • Product COM-00100 | about 3 years ago

    hm, the manufacturer’s entire website is basically broken, so you can’t see the datasheet at the moment. but i thought it was quite different from the sparkfun one, which shows a coil resistance of 320 ohms. if that were the case, it would need only 16mA. when i have time, i’ll go back and actually measure the coil resistance and the current it’s drawing…

  • Product COM-00100 | about 3 years ago

    I can confirm this relay works driven directly from a 5V Arduino digital output. However, it shouldn’t, given that the Arduino Uno max current per pin is 40mA. According to the relay’s actual datasheet, the coil dissipation is 0.72W and has a resistance of 35 ohms. In theory at 5V it should require 143mA, right? But it works.

    Update: that datasheet link now gone, this is the URL now, but it still has incorrect photo.

  • Product PRT-00115 | about 3 years ago

    If you’re looking for specific pin-number female headers, here are digikey part #s (0.1" 1-row gold ROHS):
    pins straight right-angle
    2 S7035-ND S5477-ND
    3 S7036-ND S5478-ND
    4 S7037-ND S5479-ND
    5 S7038-ND S5480-ND
    6 S7039-ND S5481-ND
    8 S7041-ND S5483-ND

  • Product SEN-09652 | about 3 years ago

    better version of this here - cheaper, also works with 5V - http://shop.moderndevice.com/products/mma7260qt-3-axis-accelerometer

No public wish lists :(