Help with comparator circuit - Electronic Circuits Projects Diagrams Free

rb salyer · 6th April 2008, 01:28 PM

I want to build a comparator cirucit using opamps that will turn on a green led at a specified temperature and while leaving the green led on, turn on a red led at a second temperature. The idea is to provide a user with a visible indication that temps are okay with the green one, but bad things are happening with elevated tempertures with the red one. I have the thermocouple and the voltages that the thermocouple genertes at specific temps.

Anyone help?

Thanks,

rb

ericgibbs · 6th April 2008, 01:32 PM

Quote:

Originally Posted by rb salyer

I want to build a comparator cirucit using opamps that will turn on a green led at a specified temperature and while leaving the green led on, turn on a red led at a second temperature. The idea is to provide a user with a visible indication that temps are okay with the green one, but bad things are happening with elevated tempertures with the red one. I have the thermocouple and the voltages that the thermocouple genertes at specific temps.

Anyone help?

Thanks,

rb

hi,
Get the datasheet for the LM3914.. www.datasheetarchive.com

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6th April 2008, 01:28 PM	(permalink)
rb salyer	Help with comparator circuit I want to build a comparator cirucit using opamps that will turn on a green led at a specified temperature and while leaving the green led on, turn on a red led at a second temperature. The idea is to provide a user with a visible indication that temps are okay with the green one, but bad things are happening with elevated tempertures with the red one. I have the thermocouple and the voltages that the thermocouple genertes at specific temps. Anyone help? Thanks, rb