Hitting target sphere "wishing you prosperity" pronunciation alarm circuit diagram

Published:2011/6/23 22:40:00 Author:Nicole | Keyword: target sphere, wishing you prosperity, pronunciation alarm | From:SeekIC

The hitting target sensor is composed of gold line drop ball and small gold loop, the copper loop adopts tinned copper wire, the target ball's gold copper wire is in the midpoint(center point)of copper ring, ordinarily, they will not touch, they are in insulation state, namely, the two points of A, B have no electricity connection, IC1's 2 foot is high level(VDD), the 555 circuit is in reset state. A trigger timer is made of 555 and R2, C1, ordinarily, it is in reset state, 3 foot output is low level. When people hit the target, the tie line of target will touch the gold loop due to shake, then A, B points are short circuit, IC1's 2 foot is low level and it is set, 3 foot turns to high level output. The high level's hold time, namely, the monostable timing time is td=1.1R2C1.



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