Knock Sensor signal level

[Fred Miranda]

I think it can be quite a bit more than 20mv.
Seems to depend on the particular type.

I just checked a Mazda(ND) unit and got some pulses of 35v pk.
Thats by rapping on it with a wrench while holding it in my hand.
(storage scope very handy here ;-) )

>From what I recall the GM units seemed more sensitive. Thought I
had one around but couldn't find it to test.

Haven't checked one in a car. (yet)

Fred

At 08:08 PM 6/27/97 +0200, you wrote:
>I want to amplify a signal of a knock sensor to feed it to a A/D conv and
>later to serial port of a laptop.I kow that frequency varies from 5 - 10kHz
>or maybe up to 15KHz.
>Can anyone tell me what voltage level i can expect from that little piezo
>thing. I doubt that it can be more than +-20mV. I have no access to a scope
>and my simple DMM shurely is the wrong tool.
>Thanks,
>Peter
>s68558 at stud-mail.uni-wuerzburg.de
>
>