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SparkFun will be closing early at 3:30 Friday 5/27 and remain closed Monday for Memorial Day (5/30). Orders placed after 2pm MT on Friday (5/27) will process and ship out on Tuesday (5/31).

Member #22640

Member Since: August 5, 2007

Country: United States

  • If you don’t need the audio decoding, why not use a dedicated SD card adapter. I’ve had success with this one from adafruit: http://www.adafruit.com/products/254

  • http://www.crmagnetics.com/Products/Assets/ProductPDFs/CR3100.pdf

    I’ve used this device (a pair of them actually) to monitor the entire power use of my house. Linear up to 100A, 0.58 gate size, weatherproof.

    Here’s a simple circuit to do precision rectification, amplification and averaging.

    http://www.crmagnetics.com/Products/Assets/ProductPDFs/Precision%20Rectifier%20Circuit%20for%20CT%20Signal%20Conditioning.pdf