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LM741: Voltage comparator

Part Number: LM741
Other Parts Discussed in Thread: LMV331, LM35

Hi Team,

Greetings. I would like ask for your assistance. I am posting this inquiry in behalf of our customer.

Customer's Inquiry:

I designed a voltage comparator. See attached schematic. In simulator that design works exactly as it should. The output is low until the voltage on pin 3 rises above the voltage on pin 2. However what I am seeing when the device is actually built is that the out put is high all the time. I cannot find any reason for this.

HV Switch.pdf

We are looking forward for your response. Thank you in advance for the support. 

Best regards,