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i need some help pls

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xrhstos

New Member
Hello . I attach the 2 first circuits, 1st with crystal and 2nd with 555, which produce square vibration 100 kHz. I wander if the 2nd can replace only the crystal or entire the 1st circuit? Also the circuit is correct? The vibration goes to 2 meters 74182, appears in the 3rd circuit. Can I make the simulation as precisely it is? The entire circuit is for measure time of reaction. If someone can analyze the circuit i will be grateful because in simulation it doesn't work:(
tank you very much.
 

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MrDEB

Well-Known Member
how accurate do you want??

a simple reaction timer can be had using a single PIC, couple resistors and a LCD dsplay
exactly what do you want to measure??
 
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