Sensitive Fire Detector, Fire Alarm Circuit.
『BD140 transistor』 view more: https://www.utsource.net/itm/p/257854.html
『100ohms resistor』 view more: https://www.utsource.net/sch/100R%20resistor
『10k resistor』 view more: https://www.utsource.net/sch/10k%20resistor
『LED』 view more: https://www.utsource.net/category/led-lighting-1.html
『Buzzer』 view more: https://www.utsource.net/itm/p/8027891.html
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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