humidity sensor circuit


Posted on May 16, 2012

This circuit combines two LTC1043s with a based humidity transducer in a simple charge-pump based circuit. The sensor specified has a nominal 400 pF capacitance at RH = 76%, with a slope of 1.7 pF/% RH. The average voltage across this device must be zero. This provision prevents deleterious electrochemical migration in the sensor. The LTC1043A inverts a resistively scaled portion of the LT1009 reference, generating a negative potential at pin 14A.


humidity sensor circuit
Click here to download the full size of the above Circuit.

The LTC1043B alternately charges and discharges the humidity sensor via pins 12B, 13B, and 14B. With 14B and 12 connected, the sensor charges via the 1 ^F unit to the negative potential at pin 14A.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Schematic diagram of a USB player Schematic Diagram
rf module based remote control
how to make 18 led light chaser circuit
fm antenna booster circuit
door bell circuit
LM1830 low level detector schematic circuit design
Convert Digital Mains Timer To Low Voltage
830MHz RF2104 power amplifier schematic circuit configuration
Sensitive optical receiver amplifier



Top