Gas Detector Block Diagram

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GasDetector

Power Supply Block Transducer Operational Amplifier (Op-Amp.) Speaker Amplifier/Buzzer

(DC/DC) Power Supply Block

products Features
NJW1933 600mA,500kHz,Step-Down Switching Regulator in SOT23
NJW4152A Switching Regulator IC for Buck Converter with 40V/1A or 40V/600mA MOSFET
NJW4152B Switching Regulator IC for Buck Converter with 40V/1A or 40V/600mA MOSFET
NJW4153 Switching Regulator IC for Buck Converter Current Mode Control with 40V/1A MOSFET
NJW4170 Current Mode Control High Speed Frequency Internal 1A MOSFET Switching Regulator IC for Buck Converter

(LDO) Power Supply Block

products Features
NJM12877 LDO with Reverse Current Protection / Soft Start / Discharge Function
NJW4104 45V Io=200mA Ultra low Quiescent current LDO
NJW4182 High Voltage Ultra low current consumption Io=100mA LDO

(AFE) Transducer

products Features
NJU9101 Low Power Analog Front End
NJU9103 Analog Front End with High Gain PGA

(Op-Amp.) Operational Amplifier

products Features
NJU77552 1.7MHz, 50µA/ch, Excellent EMI Immunity, Rail-to-Rail Input/Output, Operational Amplifier

(Speaker Amplifier/Buzzer)

products Features
NJU7089 High-Power & Low-Voltage Audio Power Amplifier
NJU8759 Analog Signal Input Monaural Filter Less 3.0W Class-D Amplifier

(Piezo Buzzer Driver)

products Features
NJU72501 Piezo-sounder Driver with Multi-mode charge pump
NJW1280 High Capacitance Piezo-sounder Driver with charge pump

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