Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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The entries are in alphabetical order by magazine name and then in chronological sequence.
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Rain detector circuit closes a relay when water bridges the gap between metal electrodes.
ELECTRONICS NOW May 1996 (v.67#5) pg. 10

Latching water sensor circuit activates a relay. Use as a fill-level monitor, sump pump switch, rain sensor, etc.
POPULAR ELECTRONICS [2] Nov 1990 (v.7#11) pg. 22

Water-level control circuit will power up a pump when the water reaches a predetermined level.
POPULAR ELECTRONICS [2] Mar 1991 (v.8#3) pg. 24

Water pump switch to keep a tank full. A lower pair of electrodes turn the unit on when empty and an upper pair turn it off when full.
POPULAR ELECTRONICS [2] May 1998 (v.15#5) pg. 57
Added Info POPULAR ELECTRONICS [2] Sep 1998 (v.15#9) pg. 67

Circuit for an AC controller for a water pump. Probes detect the presence of water and cause the pump to be activated after a preset delay of 1 to 90 seconds.
POPULAR ELECTRONICS [2] Oct 1998 (v.15#10) pg. 55

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