ucw458 Posted February 7, 2012 Author Report Share Posted February 7, 2012 man it's been a long time but do you mean transister and not 'chip'you do not use two of the same voltage transisters ,you need to match the 2'd transister to the out put voltage your expecting so the input will be within it's range , any way some thing like that it's been 30 yrs sence i play'd with circirts I'm using a LM324 op amp chip from radio shack. http://www.radioshack.com/product/index.jsp?productId=2062592 Link to comment Share on other sites More sharing options...
Shelby Posted February 7, 2012 Report Share Posted February 7, 2012 http://www.radioshack.com/product/index.jsp?productId=12651127http://www.radioshack.com/product/index.jsp?productId=12651132 why not these Link to comment Share on other sites More sharing options...
ucw458 Posted February 7, 2012 Author Report Share Posted February 7, 2012 Because the LM324 is easier and 4 amps in one chip. So I could do stereo input if I desired and just add a second knock sensor for other motor types like a boxer engine. Link to comment Share on other sites More sharing options...
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