For Christ's sake - you could have made one by now. Some sand, a dollop of germanium and a blast furnace. If chimpanzes can type out the works of Shakespeare, sooner or later a comparator will be formed.
Buy an MCP6542 - just works, looking at one working now.
Forget ebay. If you are in the UK, Farnel or RS will deliver within 12-hrs. Just taken delivery of another batch today together with MAX406 op amps (best ever used) and some LT1013s to try out. Can't speak for Trumpland.
I have an AtTiny85 running now in sleep mode consuming just 0.4uA at 3.3-V which would do the job and last into the next centuary on a coin cell.

 

My shop is just as famous as Gopher T's but for some reason folks don't want to visit often.
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During my younger days I got up your way quite a bit including twice a year to what was then NAS Adak. Just a tad cold for me now. I leave Saturday for Aruba and Panama which I am ready for.

Ron

 

For Christ's sake - you could have made one by now. Some sand, a dollop of germanium and a blast furnace. If chimpanzes can type out the works of Shakespeare, sooner or later a comparator will be formed.
Buy an MCP6542 - just works, looking at one working now.
Forget ebay. If you are in the UK, Farnel or RS will deliver within 12-hrs. Just taken delivery of another batch today together with MAX406 op amps (best ever used) and some LT1013s to try out. Can't speak for Trumpland.
I have an AtTiny85 running now in sleep mode consuming just 0.4uA at 3.3-V which would do the job and last into the next centuary on a coin cell.

Another on my block list.

 

Must be a long one