Author Topic: Knock - earphones? how?  (Read 5773 times)

Offline lost

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Knock - earphones? how?
« on: September 10, 2011, 02:00:56 am »
I was wondering what do you use to hear knock?
I have original sensor on block (bosch 3 pin)... maybe i could connect it to MIC-in on laptop and use some program to filter "noise".
Would that work or is there better solution?
 

Offline rob@vems.co.uk

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Re: Knock - earphones? how?
« Reply #1 on: September 10, 2011, 10:23:20 am »
I think there's been a few discussions on this sort of topic, some have made small amplifiers to listen with head phones, others use laptops with programs like Audacity to provide the filtering.  There is a difference between the ideal mic impedance and that of the Bosch sensor though, so you need to consider that.

Offline Jim_W

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Re: Knock - earphones? how?
« Reply #2 on: September 10, 2011, 04:15:42 pm »
I have used a Bosch knock sensor connected to the microphone input on the tuning laptop with some success.  Recording with Audacity allows adjusting the filter later.  I found in-ear headphones with earmuff style hearing protection over top allows you to monitor the knock sensor while tuning.  I did this while on the dyno, though, and it may not work very well on the street - I know where I live I am not allowed to use headphones while driving.

Offline MWfire

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Re: Knock - earphones? how?
« Reply #3 on: September 10, 2011, 10:38:00 pm »
add in series 10-100nF condensator to make high pass filter.