Free Simple Circuit Diagram
Buffer amplifier is required by a typical pH probe to isolate its 10^6 to 10^9 ohm source resistance from external circuitry. Such an amplifier is shown in the following figure. The voltage error produced by the bias current and electrode resistance is minimized by the low input current of the AD795JR. To minimize leakage, we have to use guarding, shielding, […]
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The output conditions of a Type K thermocouple, while providing cold-junction compensation, operating over temperatures between 0’C and 250’C is shown in circuit diagram below. This circuit has been designed to produce a basic output voltage transfer characteristic of 10mV/’C and operates from single +3.3V to +5.5V supplies with the AD8551. A Type K thermocouple exhibits a Seebeck coefficient of […]
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LM134 makes a good temperature sensor because it has a highly linear output characteristic. Because it is a current output device and is therefore not affected by long wire runs, LM134 is particularly useful in remote sensing applications. LM134 is easy to calibrate. It has good long term stability and can be interfaced directly with most data acquisition system, so […]
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The figure below shows the schematic of a Digital Thermostat. The output of LM35 is digitized by the A/D. The LM35 is a temperature transducer IC with an output of 10 mV per ‘C. This 10 mV corresponds to 1/2 LSB and the circuit resolution is 2 ‘C if the Vref/2 is set for 2.56 V. The resolution become 1’C […]
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