Hi,
I've attached a pic showing a basic LM35 temperature sensor + 741 op amp. The op amp is set up as a buffer for now but I will change it to an amplifier once I get the buffer to work.
I put 9V on the input (blue-green wires).. yes, the polarity is correct. I get about 250mV at room temperature on the output of the sensor (middle pin). Yet, on the output of the op amp (pin 6) I get a unchanging 1.92V.
Why is this?
I have tried:
Datasheets:
741
LM35
Thanks
I've attached a pic showing a basic LM35 temperature sensor + 741 op amp. The op amp is set up as a buffer for now but I will change it to an amplifier once I get the buffer to work.
I put 9V on the input (blue-green wires).. yes, the polarity is correct. I get about 250mV at room temperature on the output of the sensor (middle pin). Yet, on the output of the op amp (pin 6) I get a unchanging 1.92V.
Why is this?
I have tried:
- changing the op amp
- changing the sensor
- changing the breadboard
Datasheets:
741
LM35
Thanks
Attachments
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