Other Parts Discussed in Thread: TINA-TI, OPA192, TLC555
Tool/software:
Dear Team,
I am working on a ripple detector and timer circuit using two NE555 ICs. My goal is to activate a relay when the ripple lasts for more than 2 seconds. Below is a description of the circuit and the issue I'm facing.
In the circuit, I use one NE555 to detect ripples and another NE555 as the timer. A pulse voltage source simulates the ripple in LTspice. However, I am encountering an unexpected behavior: at the beginning of the simulation, the output of the second NE555 (Vout2) remains low for 120 ms. I believe this delay is caused by the filter I placed between the output of the first NE555 and the trigger of the second NE555 to reduce noise.
I would like Vout2 to remain low only when the ripple lasts longer than 2 seconds. Could anyone review my simulation and suggest how I can achieve this behavior?
Thank you in advance for your assistance.
Best regards,
Farzaneh