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My question is - why is CMP_OUT not going to HIGH (i.e. to 12V, P12V_IN) when INP_U1 is greater in voltage than INP_U2.

I think I haven't wired the LT1011 right. Do I have to do anything with the "B" and "S" pins?

I am open to using another part for the comparator as long as it is available in LTSpice.

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The output is open-collector. Add a pullup resistor to +12.

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  • \$\begingroup\$ Thank you so much, I will mark this as the answer in 8 minutes when stackexchange allows me to. \$\endgroup\$ – Neil Dey Jan 7 '19 at 16:07

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