As shown, the counting device includes an infrared pulse transmitting circuit and an infrared receiving, strobing, and control circuit. Used for product counts on production lines or conveyors.
IC1 (555) and R1, R2, C1, etc. constitute an astable multivibrator, the oscillation frequency f = 1.44 / (R1 + 2R2) C1, about 1000Hz, the duty ratio is 20:1, driving the infrared emitting diode IR31 emits an infrared pulse modulated by 1000 Hz.
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