Temperature Alarms Circuits

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:

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