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Sensitive Fire Detector, Fire Alarm Circuit.

Author:Utsource Date: 07/29/2019 SHARE

Product list:
『BD140 transistor』 view more:
『100ohms resistor』 view more:
『10k resistor』 view more:
『LED』 view more:
『Buzzer』 view more:

Step descriptions:

Step 1:-Cut off the pin C feet of BD140

Step 2:- The pin of the IR LED correspond to pin E and B, E is negative B is positive.

Step 3:-Solder the 10K resistor to the pin B .

Step 4:- The red LED , solder the negative terminal to the metal part behind BD140.

Step 5:-Solder the positive pole of the LED to the 100 ohm resistor and the 10K resistor is welded.

Step 6:-The positive pole of the buzzer is soldered together with the intersection of two resistors.

Step 7:-The jumper wire is connected to the negative of the buzzer, then connected to the negative pole of the LED.

Step 8:-The negative pole of the power supply is connected to the E pin of BD140. The positive pole is connected to the positive buzzer.

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