The delayed pulse generating circuit

Published:2011/6/21 2:03:00 Author:Seven | Keyword: delayed pulse, generating | From:SeekIC

In the figure is the delayed pulse generating circuit, this circuit can recognize the reaction time of the ultrasonic. The spread speed of the sound wave is about 340m/s, if the round-trip of the sound wave is 2~20m, then we need 5.88～58.8ms time delay. If the window detection is done, the window width is 10cm～1m, the trigger pulse width Tw is 300μs～3ms. In the circuit, the delay unit is the CMOS single steady multi-resonance oscillator 4538B. The trigger signal makes the transistor VT1 conducting before it triggers the pulse, when the delay unit begins to time, the pulse width Td＝C2（R4＋RP1）.



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