>
>John Souders wrote:
>>
>>.
>> Those 2 turns of wire actually form the primary of a simple pulse
>> transformer. The output (secondary) of the transformer is used to
>> trigger the tach timimg circuit. The best way to calibrate is the
>> connect a function generator to the secondary and use a frequency
>> counter. Everyone has one of them somewhere at home don't they?.
>>
>> Remember that a common fault with these tachs is a bad timing
>> capacitor causing the tach to fall off at high rpm. It will read
fine
>> up to say 4000rpm, but does not read accurately above thispoint.
Simple
>> to fix if you are comfortable with a soldering iron. Needs
>> recalibrating afterwards. There is a schematc on the WEB
>>
>> John
>
>You said there was a schematic to fix the tach on the web, could you
>please send me the URL? I would like to check it out. Have you done
this
>fix to your tach? How's it working?
>
>Sergio
>
I believe the tach info is in the to be found at:
http://cablepop.sc.intel.com/tiger/techtips/motach.html
I had the problem of accuracy problems at high RPM. Cap replacement
fixed it. But before you do it be able to recalibrate. Either with the
lab equipment, or against a known tach etc.
John
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