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You have got my curiosity up, why 1.4 jolts ? I guess you could use a tiny switcher or DC to DC converter to get the jolts your kit needs or just redesign using low power CMOS devices. The kit might even work as is or with a few value changes on key componants. What load are you switching ? You...

Why not just use an op amp to get the level then use a schmitt trigger to convert it to a square wave, why are all the other componants needed ?

Shmitt Trigger maybe ?

Well, I agree with Analogkid2digitaladult, the 4-20mA current mode idea is the best for the long cable run you talked about, by far. It has good resistance to noise and is used all the time in industrial environments. I dont know what your requirments are, but if it was me, for my own personal...

BTW current mode like the other post states is best for long runs, if your DAQ supports it. My suggestion is an alternitive only if it does not. It also provides common mode noise rejection if done correctly.

Hello, this is my first post in this forum so greetings to all. I would suggest using an intrumentation amp to bring the signal up to a better range, say 0 to 10 volts. Its easy to build from an op amp and can be found by googleing AN-31.pdf + op amp. AN31.pdf is a good op amp circuit doc put...