Over-Temperature Alarm Circuit Uses Common, Inexpensive Components

Focus:

An audible over-temperature alarm built using an NTC thermistor, a 741 op amp, a 555 timer, and several discretes can be used to monitor the temperature of heatsinks and other components.

What you’ll learn:

• How to build an overtemperature alarm with audible output

Notes:

ED's Ideas For Design

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Author & Publication:

T.K. Hareendran, freelance electronic circuit designer, technical writer, columnist, and consultant, Electronic Design, Sep 11 2008

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