Automatic hand washing device circuit with SM9576

Published:2011/3/29 20:34:00 Author:Jessie | Keyword: hand washing device | From:SeekIC

Automatic hand washing device circuit is shownin the figure 1. 220V AC power is step-down by transformer, V1 ~ V4 bridge rectifier, C1 is filteredto 9VDC power, this power supply to relay K1 ~ K3 as work power, then become 3V DC powersupplied toSM9576 as work power. The core device of automatic hand washing device circuit is SM9576, it contains infraredtransmit drive circuit and infrared receiving amplify circuit, its reception is decided by the size of the capacity of the sensitivity, when the C7 is in 0.01 ~ 0.1 u F, the receiving distance is changingbewteen 5 ~ 25cm.



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