Knock detector circuit

[A70Duster at aol.com]

Does anybody have a schematic for making a knock detector circuit.  I'm 
guessing the circuit would have a front end band pass filter of 4k to 7k 
Hertz.  Then that signal could be used to trigger a 555 timer that could 
flash a light/LED.

It's on a SBC, 4.04" bore, 3.75" stroke.

Something simple and I don't want to reinvent the wheel.

Thanks!

----- End of forwarded message from owner-diy_efi at diy-efi.org -----
----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org