15362^0

by epccs.
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2 layer board of 0.90x0.55 inches (22.89x13.97 mm).
Shared on February 13th, 2016 07:51.

HT

This simple circuit transmits a 3mA or 10mA current loop value as a pulse, it is controlled with the venerable 555 timer connected to a capacitive moisture sensor and a thermistor. The current loop flows in a CAT5 pair that provides well-known transmission line effects and superior noise immunity. The current sensing resistor is also a termination for the transmission line.

HT

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