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Temperature Alarm Circuits

Temperature Alarms:  #'s - M       O - Z
 

Last Updated: October 24, 2017 02:55 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Oscillator/Reference Oven Temperature Regulation -  The LTC2990 is used to monitor system temperatures, voltages and currents.  Through the i2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC.  The internal 10ppm/C reference minimizes the number of supporting __ Linear Technology/Analog Devices App Note, Mar 16th 2011

Platinum RTD Digitizer Accurate within 1 Over 0C to 100C -  Platinum RTD Value is Linearly Converted to Period by LTC1799.  Logic and Second LTC1799 Clock Digitize Period into Output Data Bursts.  Bootstrapping Pin Capacitance is used to Permit Remotely Located Sensor.  __ Linear Technology/Analog Devices App Note, Apr 7th 2010

Platinum RTD Signal Conditioner with Curvature Correction -  The left stage forms a stable precision current source by establishing the reference voltage across a precision resistor, and about half of this current passes through the sensor.  The right OpAmp provides an amplification of the resistance difference between the sensor and a fixed precision resistor to generate a temperature__ Linear Technology/Analog Devices App Note, Jun 21, 2011

Pseudodifferential Multichannel Bridge Digitizer & Digital Cold Junction Compensation -  This circuit enables pseudodifferential measurements of several bridge transducers and absolute temperature measurement.  Consecutive readings are performed on each side of the bridge by selecting the appropriate channel on the LTC2428.  Each output is digitized and the results digitally subtracted to obtain the pseudodifferential __ Linear Technology/Analog Devices App Note, Apr 29th 2010

Ratiometric Sensor to Pulse Width, Non-Inverting Response -  The LTC6992 is a silicon oscillator with an easy-to-use analog voltage-controlled pulse width modulation (PWM) capability.  The LTC6992 is part of the TimerBlox family of versatile silicon timing devices.  A single resistor, RSET, programs the LTC6992s internal master oscillator frequency.  The output frequency is determined__ Linear Technology/Analog Devices App Note, Jun 16th 2010

Remote CPU/ASIC/FPGA Temperature Sensor -  The LTC2997 is a high-accuracy analog output temperature sensor.  it converts the temperature of an external sensor or its own temperature to an analog voltage output.  A built-in algorithm eliminates errors due to series resistance between the LTC2997 and the sensor diode.  __ Linear Technology/Analog Devices App Note, Jul 7th 2011

Sensitive Freezer Alarm with Buzzer -  Here is a simple freezer alarm circuit, but ultra sensitive with a buzzer.  The circuit raises an audio alert when the temperature inside the freezer box goes up above a preset level.  The circuit requires 9V dc supply and can power from a standard 9V alkaline battery.  A negative temperature co-efficient type (NTC type) small __ Designed by T.K. Hareendran

Single Supply Type K Thermocouple Signal Conditioning Amplifier with Cold Junction Compensation -  The LTC2050 is a zero-drift precision chopper stabilized operational amplifier available in the 5- or 6-lead SOT-23 and SO-8 packages.  it minimizes board area while providing uncompromising DC performance, including 3mV (max) DC offset and 30nV/C (max) DC offset drift.  it operates from a 2.7V supply while still supporting __ Linear Technology/Analog Devices App Note, Apr 9th 2010

Temperature Monitoring with an NTC Thermistor While Measuring Load Current & LTC4151 Supply Current -  The LTC4151 is a high side power monitor that operates over a wide voltage range of 7V to 80V.  in default operation mode, the onboard 12-bit ADC continuously measures high side current, input voltage and an external voltage.  Data is reported through the i2C interface when polled by a host.  The LTC4151 can also perform on-demand__ Linear Technology/Analog Devices App Note, Apr 26th 2010

Temperature Sensor Control -  A basic circuit using Diodes to detect temperature differences __ Designed by G.L. Chemelec

Temperature to Frequency Converter -  3% Linearity from 20C (Fout = 20kHz) to 75C (Fout = 25kHz) The LTC6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz.  it can be used as a fixed-frequency or voltage-controlled oscillator (VCO).  The LTC6990 is part of the TimerBlox family of versatile silicon timing devices.  __ Linear Technology/Analog Devices App Note, Jun 16th 2010

Temperature-to-Frequency Converter -  Precision oscillator structure uses SCR effect to discharge integration capacitor.  A temperature dependent device (LM134) effects the integrator trip point to form a variable interval.  An output transistor detects the reset action and forms a logic pulse.  __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Thermally Controlled NiCad Charger -  A voltage controlled current (maximum of 1A) is used to charge a NIC d battery.  The control voltage is derived from the temperature difference between the battery and the ambient air.  The charge current is reduced as the battery heats up.  __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Thermocouple Thermometer with Cold Junction Compensation -  The LTC2997 is a high-accuracy analog output temperature sensor. __ Linear Technology/Analog Devices App Note, Jul 7th 2011

Thermostat Control for Electric Heaters -  One Advantage of these two units is the Sensor can be placed Away from the heater, therefore sensing the Actual Room temperature, not the direct heat from the heater.  These can also be used in a confined space with a Heat Lamp, to create a Drying Oven  __ Designed by G.L. Chemelec

Two-Terminal Temperature-to-Current Thermometer Suitable for Use at the End of Long Wire Runs -  Adding the LT3092 to a thermistor kit along with three 0.1% accuracy resistors and one final trim, a very accurate 2-terminal temperature-to-current converter can be built.  This circuit measures 700μA operating current at 0C, dropping by 2μA every degree until 100C, at which point the current measures 500μA.  The obvious__ Linear Technology/Analog Devices App Note, Oct 26th 2010

USB Based Temperature Monitor using the ADuC7120 Precision Analog Microcontroller & an External Thermistor  -  Circuit linearization techniques can be accomplished in software; however, that will not be discussed here.  , Despite the powerful ARM7 core and high speed SAR ADCs, the ADuC7122 still provides a low power solution__ Analog Devices from the Lab

Wet Bulb Psychrometer -  The LTC2990 is used to monitor system temperatures, voltages and currents.__ Linear Technology/Analog Devices App Note, Oct 26th 2010

Wind Direction & AirFlow Measurement -  The LTC2990 is used to monitor system temperatures, voltages and currents.  Through the i2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC.  The internal 10ppm/C reference minimizes the number of supporting __ Linear Technology/Analog Devices App Note, Mar 16th 2011

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Temperature Alarms:  #'s - M       O - Z

 


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