Simple Air Flow Detector


Parts List-

R1 - 1 - 100 Ohm 1/4W Resistor
R2 - 1 - 470 Ohm 1/4W Resistor
R3 - 1 - 10k 1/4W Resistor
R4 - 1 - 100K 1/4W Resistor
R5 - 1 - 1K 1/4W Resistor
C1 - 1 - 47uF Electrolytic Capacitor
U1 - 1 - 78L05 Voltage Regulator
U2 - 1 - LM339 Op Amp
L1 - 1 - #47 Incandescent lamp with glass removed (See "Notes")
D1 - 1 - LED
MISC - 1 - Board, Wire, Sockets for ICs, etc.

Notes-
1. The glass will have to be removed from L1 without breaking the filament. Wrap the glass in masking tape and it in a vise. Slowly crank down until the glass breaks, then remove the bulb and carefully peel back the tape. If the filament has broken, you will need another lamp.

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