555 voice circuit in fencing

Published:2011/8/4 21:57:00 Author:Ecco | Keyword: 555 , voice circuit , fencing | From:SeekIC

The circuit is shown as figure 11-19, 555 is the core of the circuit. The pin 4 of 555 is the reset terminal, when the voltage is below 0.7V, then the shock ends. The leading wire of pin 4 is connected to metal arrow, if hitting the target is connected to the power (higher than 1.4V) in the game, the 555 circuit will shock, vibration frequency depends on R1, R2, C1's value, that is, f = 1.44 (R1 +2 R2) C1. icon parameter frequency is about 800Hz, if hitting, it will emit sound. If tipis away from the target, the circuit is forced to be in reset state.



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