Jasen Betts wrote in a message to Roy J. Tellason:

 RT> Maybe a couple of the CMOS versions of the 555,  what's that a 7555?
 RT> Do they make a dual versoin of that part?

 JB> I've not seen a 7556 at any retial outlet. but all you gain with a
 JB> 556 over a 2 555s is a slightly smaller footprint and  hahving to
 JB> drill 2 fewer holes in the PCB

I've not seen one ever,  that I can recall.  But Wayne's idea of using a
quad gate is also a good one.

 JB> with a cmos/thermistor setup the biggest quiescent drain is
 JB> possibly going to be the thermistor and the trimpot.

Probably.

 JB> what's the capacity of an 9v alkaline anyway? 200mAh ?

According to my little chart here it's 500mAH,  but I have my doubts about
that.  They give "typical drain" as being 15mA...

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