Two Simple Crystal Test Circuits
Posted on Feb 5, 2014
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A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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Built around a 555 timer IC, this pulse generator can be built into a probe for logic
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