nuckolls.bob(at)aeroelect
Guest
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 Posted: Fri Oct 23, 2009 7:12 am Post subject: p-lead signal conditioning or tach gen usage |
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At 08:59 PM 10/22/2009, you wrote:
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
>
>Bob, I was thinking of only rectifying one phase not all three. My
>thought was that the tach gen is rotating at half engine speed, I'd
>get another "peak" in the signal from one phase and essentially
>double the frequency.
Hmmmm . . . yeah, that would work.
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On further reflection, there's a simple
collection of components that can be used
to give you a 4x increase in frequency . . .
assuming that your tach input is watching
for EDGES of transition and doesn't care
about symmetry.
Your comparator looks at full-wave
rectified output to give you a 2x
square wave. You then add an exclusive-
or gate and a resistor-capacitor to
convert each edge of the 2x into 4
narrow pulses effectively doubling the
total number of edges a second time.
Let's see what your 'scope studies
tell us.
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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