Temperature Sensor

Make straight play three digital voltmeter circuit diagram

Published:2014/2/18 21:47:00 Author: | Keyword: Make straight play three digital voltmeter circuit diagram,

Make straight play three digital voltmeter circuit diagram   (View)

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Four and a half LCD digital voltmeter circuit diagram

Published:2014/2/18 21:44:00 Author: | Keyword: Four and a half LCD digital voltmeter circuit diagram,

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Four and a half LED counting circuit diagram

Published:2014/2/18 21:41:00 Author: | Keyword: Four and a half LED counting circuit diagram,

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Constant Temperature Circuit

Published:2013/3/10 23:05:00 Author:Ecco | Keyword: Constant Temperature

The 7805 voltage regulator provides a reference voltage that is fed into a resistive bridge formed on one side by the 20K trimmer and the other side by the 3.3K resistor and the 1K/thermistor combination. The termistor is an NTC (Negative Temperature Coefficient) type. The op-amp is run in a differential mode and tries to keep its inputs at the same potential by the thermal feedback loop formed by the heater and the thermistor. The three 1N4001 diodes are used to bias the emitter of the transistor up enough that it can shut off fully with the limited voltage swing from the 741 op-amp. The heating indicator LED (a standard red LED) also taps off of the same diode ladder to enable it to shut off entirely. The value of the (1uF) capacitor in the op-amp feedback loop may need to be adjusted if the circuit rings , or swings back and forth before stabilizing on a temperature. The capacitor value is specific to the thermal mass that is being temperature stabilized. The heater resistor is rated at approximately 40 ohms and 5 watts. The value of the resistor determines the heating rate and the power consumption. The resistor value should not be too low or the resulting high current will damage the 1N4001 diodes and/or the TIP122 transistor.   (View)

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Temperature sensor current transmission circuit

Published:2012/10/11 21:21:00 Author:Ecco | Keyword: Temperature sensor, current transmission

Resistors in the circuit use metal film resistors, and its accuracy is better than 1%, and the temperature coefficient TC is less than ± 50 × 10-6 / k; measuring range: 0 to 100 ° C , the current I = 4 + T/6.25, current unit is mA, and temperature T unit is ℃. The circuit is composed of KTY87 two-wire current transducer, Wheatstone bridge with preamplifier, current transmitter output stage and regulator.   (View)

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Temperature sensor transmitter circuit

Published:2012/9/11 1:30:00 Author:Ecco | Keyword: Temperature sensor, transmitter

RTD input is connected to bypass capacitor to reduce or eliminate the interference. When the capacitor is connected to pin 7 of pipe, the DC voltage on pin 7 is not equal to zero, that means the pin 7 is grounded.   (View)

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Temperature sensor interface circuit

Published:2012/9/11 1:23:00 Author:Ecco | Keyword: Temperature sensor, interface

The resistor in circuit uses a metal film resistor, and its precision is better than ± 1 %, temperature coefficient TC is less than 50 × 10-4 / K, measurement temperature range is between 0~ 100 ℃, output voltage Vo = 0.5 ~ 4.5V, supply voltage VS = 5.0 V, Vo = 0.2VS × (0.5 +0.04 × TC). NE5230 is a low bias temperature precision instrument amplifier.   (View)

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TEMPERATURE SENSOR WITH 4 TO 20mA CURRENT LOOP

Published:2012/9/10 20:24:00 Author:Ecco | Keyword: TEMPERATURE SENSOR , 4 TO 20mA , CURRENT LOOP

I designed a circuit similar to this one years ago to accurately measure the air temperature inside a building 1000s of feet from a control room. The circuit uses a very robust current loop method. It uses a highly accurate semiconductor temperature sensor and an equally accurate voltage reference. The circuit includes a diode bridge, so it is polarity independent. By using the component values indicated, the circuit should not require calibration. It has a range from ?40F to +120F and an accuracy of +/- one degree F. Source: discovercircuits   (View)

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LM134-LM10 Thermometer/Temperature Sensor

Published:2012/9/3 3:08:00 Author:Ecco | Keyword: Thermometer, Temperature Sensor

Using LM134 and LM10 integrated circuits, we can build a thermometer which has -55 to 150°C sensing range. The ideal meter for this circuit is a 0-200uA digital ampere meter, which can show both positive and negative polarity. This will make the circuit suitable for indicating temperatures below 0°C. LM134 is basically a current source with very accurate and consistent temperature coefficient, so many temperature sensing application find it suitable for the sensor. Here is the schematic diagram of the circuit: (Source: freecircuitdiagram)   (View)

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Temperature-voltage transform circuit composed of precision temperature sensor

Published:2011/8/26 3:08:00 Author:Jessie | Keyword: Temperature-voltage transform, temperature sensor

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Total positive supply long-distance transmission circuit composed of LM35DZ celsius temperature sensor

Published:2011/8/26 2:49:00 Author:Jessie | Keyword: supply long-distance transmission, celsius temperature sensor

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In ground for long-distance transmission circuit composed of LM35DZ celsius temperature sensor

Published:2011/8/26 2:49:00 Author:Jessie | Keyword: long-distance transmission, celsius temperature sensor

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four-and-a half display voltage meter formed by the single-chip CMOS IC circuit

Published:2011/8/11 4:13:00 Author:John | Keyword: four-and-a half display voltage meter, single-chip, CMOS, IC

This is the four-and-a half display voltage meter composed of the ICL7129 monolithic CMOS IC. It is equipped with the multi-scan matrix (100Hz) LCD (liquid crystal display) digital device. It is especially for production of high-resolution pocket multimeter. It has the auto-zero function without the need for external capacitors. Only a 9V power supply (battery) is required. The current consumption is only 1mA and the changing speed is 2 times / second. Its direct input analog voltage range is ± 200 mA and its maximum bit resolution is 10μV. When the power supply voltage is lower than7.2V, the alarm and display functions can be identified.   (View)

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CMOS four-and-a half decimal counter circuit

Published:2011/8/11 3:54:00 Author:John | Keyword: CMOS four-and-a half decimal counter

This is the CMOS four-and-a half decimal counter, which includes the count, the latch, by-bit scanning output circuit and protection circuit inside. Only an external capacitor is needed to change the scanning speed freely. Its power supply voltage is within 3 ~ 10V and its static current consumption is less than 1mA. The counting frequency ranges from dc to several megahertz. And it uses DIP-16 pin package. The counting pulses are coupled to DG6010 from high-speed photodiode isolator SL950 to count. Then the BCD code sent by DG6010 is converted into 7-segment signal by CC4511B. Then the 7-segment signal is added to four-phase LED to display.   (View)

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MARK_SENSOR_FOR_CARDS

Published:2009/7/20 10:23:00 Author:Jessie

Automatically transcribes up to 40 pencil marks on specially printed 90-column cards into machine code and block-punches information into cards in any desired format at 150 cards per minute -F. A. Frankl, Transcribing Field Markings by Optical Scanning, Electronics, 34:31, p 49-51.   (View)

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Smart Temperature Sensor MAX6698 With 7 Channels Circuit

Published:2011/7/28 6:38:00 Author:Robert | Keyword: Smart, Temperature, Sensor, 7, Channels

As shown, the MAX6698 could only fully connect three temperature-measuring transistors (VT1~VT3) and three thermistors (RT1~RT3). Its internal referenced voltage source UREF would supply for the three thermistors through the resistance REX1~REX3 separately. The voltage-drop would be send to pin of THER1~THER3 separately. The temperature-measuring transistor could select the CMPT3904, SST3904, KST3904-TF, SMBT3904, FMMT3904CT-ND and other types.   (View)

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FAHRENHEIT_THERMOMETER

Published:2009/6/29 2:03:00 Author:May

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BASIC_DIGITAL_THERMOMETER_CELSIUS_AND_FAHRENHEIT_SCALES

Published:2009/6/29 2:02:00 Author:May

Maximum reading on the Celsius range is 199.9 ℃, limited by the (short-term) maximum allowable sensor temperature. Maximum reading on the Fahrenheit range is 199.9 °F (93.3 ℃), limited by the number of display digits. VREF for both scales is 500 mV.   (View)

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GROUND_REFERRED_CENTIGRADE_THERMOMETER_1

Published:2009/6/29 1:59:00 Author:May

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TEMPERATURE_SENSOR_1

Published:2009/6/29 1:58:00 Author:May

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