Over-temperature alarm circuit

Posted on Mar 28, 2007

It uses a negative temperature coefficient thermistor for temperature sensing element Rt. By the resistor Ri, Rs, , potentiometer RP and thermistor R. Composition temperature bridge; by the transistor VTi, VT2 constituting the differential amplifier; by the transistor and diode

Over-temperature alarm circuit
Click here to download the full size of the above Circuit.

VD composition VTs output circuit; by the transistor VT4, VTs and capacitor C etc. audio oscillator. Adjustment potentiometer RP, can change the temperature setting.

Leave Comment

characters left:

New Circuits



Popular Circuits

Mini Metronome
Light Control System (OP295)
Positive And Negative Voltage Switching Supply
Simple 2M 6M Transverter Circuit
remote control circuit
Reliable 6 Watt Hi Fi Audio Amplifier Using TDA2613
measurement Measuring large differential voltage
Detector switch circuits
Single-ended Class A amplifier circuit diagram of 6N1 + 6P3P