Note: The WBO2 project is defunct, and these pages are no longer being actively maintained.

Devices in green are the better choices.
This is based on performance versus price.
 

Location	Part #	Spec
Op-amps U2 & U4:
	LM324	0c to 70c
	LM324A	0c to 70c
	LM2902	-40c to 85c
	LM224	-25c to 85c
	LM224A	-25c to 85c
	LM124	-55c to 125c
	LM124A	-55c to 125c
Analog Switch U3:
	CD4066
	74HC4066
Voltage references D5 & D11:
	LM431BCZ	0c to 70c
	LM431BIZ	-40c to 85c
	TL431C	0c to 70c
	TL431AC	0c to 70c
	TL431I	-40c to 85c
	TL431AI	-40c to 85c
	LM431CCZ	0c to 70c
	LM431CIZ	-40c to 85c
Voltage reference D8:
The only concern with this device is the temperature range.  Extreme accuracy is not required.
	LM385-1.2	0c to 70c
	LM285-1.2	-40c to 85c
	LM185-1.2	-55c to 125c

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