Sensors and Detectors:
Toxic Gas Detector and Alarm Circuit with
TGS813 - The danger always exists, when
the fuel gases such as propane or gas are
confined to a small area. The alarm of toxic
gases figs. 1-45 utilizes a
tin-oxide-semiconductor. A coil of thin wire
heated by a battery 12 V via IC1 and IC2,
which pulses the voltage to the coil of the
sensor, saving a significant amount of
energy. Diode Zener Dl provides a constant
voltage to the filament coil sensor.
resistance of the sensor reduces the sensor
is exposed to toxic gases such as hydrogen,
carbon monoxide and propane.
Gas Sensor - All-in-one (with a sensor and a temperature compensation device)
Flame/Smoke Detector - Flame, gas and smoke detector for fire alarm. You can combine this circuit with alarm circuit. The output will be the relay which switch on and switch off the alarm.
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