Thermocouple signal amplification
- From: avr2005@xxxxxx (apprentice_nerd)
- Date: 23 May 2005 17:41:39 -0700
Hi.
I am attempting to measure temperature with a thermocouple
connected to an AVR atmel microcontroller.
I am wondering if a LM1458 dual general purpose operational
amplifier can be used to amplify the signal from the thermocouple.
I am familiar with the AN844 "Simplified Thermocouple Interfaces and
PICmicro MCUs" from microchip however i dont have experience in
opamps.
Is a negative voltage to LM1458 necessary to achieve moderate acurracy
-/+2 C?
Is the 555 negative voltage generator circuit suitable for such an
application?
Can i take the amplified signal and feed it to the second amplifier in
LM1458?
I have made a web search for thermocouple amplification circuits
but the majority suggest the use of specialized ICs or Opamps whose
cost is not
justified for amateur experiments like mine.
Any thought or advice is going to be deeply appreciated.
KEYWORDS: AVR PIC THERMOCOUPLE AMPLIFICATION LM1458 TEMPERATURE SENSOR
.
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