HI,
I'm trying to build an ultrasonic frequency counter with an electret microphone. I'll use a 4024 counter to divide the input frequency by 32 and feed it into a microcontroller.
I am unsure as to how to design the mic amplification to get the required amplitude to feed into the 4042. I need to circuit to operate at 5v. I've seen designs with a lm386, but am unsure if this chip is a good choice. What opamp would be suitable for an application like that?
Also I would like to add a high pass filter, to filter out frequencies below ~5kHz...
Thanks four your time!
Cheers
Meinrad
I'm trying to build an ultrasonic frequency counter with an electret microphone. I'll use a 4024 counter to divide the input frequency by 32 and feed it into a microcontroller.
I am unsure as to how to design the mic amplification to get the required amplitude to feed into the 4042. I need to circuit to operate at 5v. I've seen designs with a lm386, but am unsure if this chip is a good choice. What opamp would be suitable for an application like that?
Also I would like to add a high pass filter, to filter out frequencies below ~5kHz...
Thanks four your time!
Cheers
Meinrad