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.
tank you very much.