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ed_ma61 Forums Junkie Location: Lost in the K hole Registered: May 2002	Re: Knock Sensor Circuit Design ... Tue, 22 July 2003 06:52 Shane, can you comment on the following... from BOZZ on PF's :: Quote: That knock sensor offers no adjustability, only offers output should it pick up a signal on the input which is greater than 0.7v (1N914 diode forward bias voltage). The rest of the circuit is to keep the LED/buzzer triggered for a time period so you know knocking has occured. and my reply in PF's :: Quote: interesting... so, to clarify, ANY input signal, regardless of frequency, if it produces an aplitude over 0.7v, will trigger the output of that circuit (with prologation of the output for sensible LED/buzzer triggering). so it may NOT be specific for the harmonics and knock characteristics of my engine, but it will signal the occurance of 'big' ie >0.7v detected events... (just say) i want to use this circuit (or similar) as a triggering device for a h20/methanol injection system. im not after accurate knock detection per se, rather, im after something that will trigger the injectors at a reasonable threshold... to my mind, assuming the 0.7v threshold is 'appropriate', this circuit could provide such a threshold trigger... what could i do to modify the circuit in order to perhaps crudely 'tune' it more specifically to my engine ie, raise of lower the 0.7v threshold etc. id image id just change that diode.. [Report message to a moderator]

	Subject	Poster	Date
	Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 04:50
	Re: Knock Sensor Circuit Design ...	Cool1	Tue, 22 July 2003 05:41
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 05:45
	Re: Knock Sensor Circuit Design ...	roger	Tue, 22 July 2003 05:46
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 05:52
	Re: Knock Sensor Circuit Design ...	oldcorollas	Tue, 22 July 2003 05:58
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 06:10
	Re: Knock Sensor Circuit Design ...	sideshow	Tue, 22 July 2003 06:13
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 06:26
	Re: Knock Sensor Circuit Design ...	Cool1	Tue, 22 July 2003 06:39
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 06:52
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 06:58
	Re: Knock Sensor Circuit Design ...	Cool1	Tue, 22 July 2003 07:03
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 07:08
	Re: Knock Sensor Circuit Design ...	oldcorollas	Tue, 22 July 2003 08:10
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 10:01
	Re: Knock Sensor Circuit Design ...	Cool1	Tue, 22 July 2003 09:00
	Re: Knock Sensor Circuit Design ...	Cool1	Tue, 22 July 2003 07:01
	Re: Knock Sensor Circuit Design ...	sideshow	Tue, 22 July 2003 12:14
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 12:37
	Re: Knock Sensor Circuit Design ...	Allan	Tue, 22 July 2003 12:41
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 12:55
	Re: Knock Sensor Circuit Design ...	sideshow	Tue, 22 July 2003 12:43
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 13:02
	Re: Knock Sensor Circuit Design ...	Allan	Tue, 22 July 2003 13:12
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 13:26
	Re: Knock Sensor Circuit Design ...	ed_ma61	Tue, 22 July 2003 14:26
	Re: Knock Sensor Circuit Design ...	humble	Tue, 22 July 2003 17:22
	Re: Knock Sensor Circuit Design ...	ed_ma61	Wed, 23 July 2003 00:17
	Re: Knock Sensor Circuit Design ...	Norbie	Wed, 23 July 2003 00:14
	Re: Knock Sensor Circuit Design ...	Allan	Wed, 23 July 2003 02:19
	Re: Knock Sensor Circuit Design ...	ed_ma61	Wed, 23 July 2003 03:02
	Re: Knock Sensor Circuit Design ...	E30-323ti	Wed, 23 July 2003 03:11
	Re: Knock Sensor Circuit Design ...	ed_ma61	Wed, 23 July 2003 03:20
	Re: Knock Sensor Circuit Design ...	E30-323ti	Wed, 23 July 2003 03:34
	Re: Knock Sensor Circuit Design ...	ed_ma61	Wed, 23 July 2003 03:40
	Re: Knock Sensor Circuit Design ...	ed_ma61	Wed, 30 July 2003 11:48
	Re: Knock Sensor Circuit Design ...	-Mark-	Wed, 30 July 2003 13:22

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