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MICRO POWER OVER-TEMPERATURE ALARM The circuit is powered for years by a single 3 volt lithium battery. It sounds an alarm when the temperature exceeds a certain point. With some minor changes the circuit could also be
configured for an under temperature (freeze) alarm. The circuit uses a cheap but accurate thermistor as the temperature sensor.
Links to electronic circuits, electronic schematics, designs for engineers,
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Measure humidity and temperature on one TTL line: 08/30/01 EDN Design Ideas / (added 1/05) By combining
the responses of an Analog Devices (www.analog.com) AD590 temperature sensor and a Humirel (www.humirel.com) HS1101 humidity sensor, you can generate a single TTL-level signal containing
information from both sensors (Figure 1). This design uses a 74HC123 monostable multivibrator, IC1, to form a free-running oscillator. ...
MPU temperature meter #3: Multi point diode temperature meter to replace thermister temperture meter. This is for diode
temperture sensors icludes on-die thermal diode of micro-processor. (circuit design added 7/06)
MPU temperature meter: Multi point temperature meter which displays tempertures to an LED display with time divided. This
is good for monitoring temperature of PC components. (circuit design added 7/06)
Network imitates thermocouples: 11/08/01 EDN Design Ideas / (added 1/05) Thermocouples find widespread
use for temperature measurement in systems. During system design or testing, you must observe the system's response at different temperatures. However, it's inconvenient to heat a thermocouple
every time you need to check a system's performance. You can use the simple trick of touching the thermocouple with a hot soldering iron, but this method provides only ... ...
Parallel port provides high resolution temperature sensing: 10/03/02 EDN Design Ideas / (added 1/05)
High-resolution temperature sensing at low cost is possible using only one chip attached to the PC's parallel port (Figure 1). The Dallas Semiconductor (www.dalsemi.com) DS1722 digital
thermometer allows measurement resolution as fine as 0.0625°C in digital form and with linear response. The accuracy specification is only 2°C, but you can improve this figure by careful
calibration....
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