15362^0
author: epccs
2 layer board of 0.90 x 0.55 inches (22.9 x 14.0 mm)
Uploaded:
January 07, 2016
Shared:
February 13, 2016
Total Price:
$2.45
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
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.
