Thermometer For 5V Operation Circuit

Posted on Feb 4, 2013

At the heart of this simple circuit is the well-known type KTY10 temperature sensor from Siemens. This silicon sensor is essentially a temperature-dependent resistor that is connected as one arm in a bridge circuit here. Preset PI functions to balance the bridge at 0C. At that temperature, moving coil meter Ml should not deflect, i.e., the needle is in the center position. Temperature variations cause the bridge to be unbalanced, and hencc produce a proportional indication on the meter. Calibration at, say, 20C is carried out with the aid of P2. The bridge is fed from a stabilized 5.1-V supply, based on a temperature-compensated zener-diode.

Thermometer For 5V Operation Circuit
Click here to download the full size of the above Circuit.

It is also possible to feed the thermometer from a 9-V battery, provided D1-D3, Rl and Cl are replaced with a Type 78L05 voltage regulator, because This is more economic as regards to current consumption.

Leave Comment

characters left:

New Circuits



Popular Circuits

Scope Probe
Sequential flasher
Battery condition indicator
20W Stereo Amplifier Circuit
Use Analog Techniques To Measure Capacitance In Capacitive Sensors
ADUC845 12MIPS 8052 Flash MCU + 10-Ch 24-Bit ADC + 12-Bit DAC
technical information for leds
fet amp circuit
Circuit explanation for Ultrasonic Range Meter