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

Stereo to Mono Converter
AVR terminal for serial port
DC Motor Control Circuit
dc control for triacs
converter lhc4 6 8ka 08v
Nostalgic Crystal Radios
Car stereo amplifier based TDA1535
Linearized input bypass circuit XTR112
Low drift integrator
Power Mixer circuit diagram
15V TOP224Y 2A DC output switching power supply circuit