hi, i'm italian sorry for mistakes. I'd like to build an infrasonic detector for security purpose. take a look to
VMic is a microphone, then there is a low pass filter (about 5 Hz), then U1,U2 as amplifiers and filters then U3 comparator with Vref - about 1.7 V, at last a BJT in on-off mode to ensure 0-5V output.
1) Is a good choice a Microchip's MCP6004 (QUAD 1MHZ LO POW OP AMP)?2) how can i set up the circuit?
3) i want to use a microphone peel off my PC laptotp?4) Vcc is 5 V... Is this a problem ?
Thanks