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Registered
Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,350
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Q1 forms a voltage regulator. Q2 & Q3 form a one-shot with .47 & 2K
basically providing the timing ~ 1ms. Each ignition trigger "fires" the one-shot
which provides an average current to the meter proportional to the RPMs.
Note: Q2 is biased "on" and an input of 90-100 volt positive pulse is required
to turn "off" Q2 and trigger the one-shot.
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Loren
Systems Consulting
Automotive Electronics
'88 911 3.2
'04 GSXR1000
'01 Ducati 996
'03 BMW BCR - Gone
Last edited by Lorenfb; 11-23-2007 at 05:29 AM..
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