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The simple air flow meter circuit is shown in the figure. The components in the figure are as follows: R1 is 100 Ohm 1/4W resistor, R2 is 470 Ohm 1/4W resistor, R3 is 10k 1/4W resistor, R4 is 100K 1/4W resistor, R5 is 1K 1/4W resistor, C1 is 47uF capacitor, U1 is 78L05 regulator, U2 is LM339 operational amplifier L1 is #47 incandescent lamp, D1 is LED.
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