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December 19, 2014


Cold Activated Switch
Detect Fan Failure With A Single Transistor:  09/05/00 Electronic Design - Ideas for Design /  In low-cost systems where inexpensive fans are used with no fan control, fan-failure detection is particularly useful. Fans running full-time use up their operating life more quickly than those. . .
Freezer Door Alarm:  Fair Warning: this site has pop-up ads
Fridge Door Alarm
Frost Alarm