Monday, August 11, 2014
Dual Sensor 555 Timer Alarm
This electronic schema is a very nice and simple alarm schema that is based on the 555 timer integrated schema. This alarm schema can be used with many types of sensors like : light or temperature sensors. As you can see below some types of sensors that can be connected at this type of alarm schema ( darkness , light , cold and heat sensor ).
If the sensor detects that the temperature or light is outside of the desired range the alarm will be activated .By turning the potentiometer from the base of Q1 you will modify the sensibility of the sensor . When the alarm is activated the Q2 transistor acts as an audio amplifier and speaker driver for the 16 ohms speaker .
If the sensor detects that the temperature or light is outside of the desired range the alarm will be activated .By turning the potentiometer from the base of Q1 you will modify the sensibility of the sensor . When the alarm is activated the Q2 transistor acts as an audio amplifier and speaker driver for the 16 ohms speaker .
Dual Sensor 555 Timer Alarm Circuit Diagram
This alarm schema require a 12 volts DC power supply schema .
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