Re: Frequency signal multiplier - repost.

In article <YAtBf.12303$mu.3318@xxxxxxxxxxxxxxxxxxxxxxxxx>,
George Gosbee <georgegosbee@xxxxxxxxxxxxxxxx> wrote:
[...]
>Are you saying in your last paragraph that on a digital circuit for every 2
>pulses in I can get 3 out? If so that would seem to be the easy way to go.
>Would it work over the frequencys I require say 0.4 kHz to 7.5 kHz (400 to
>7500 rpm) and at the 5.5v signal input and output? Would this be done using
>gates?

7.5KHz and 7500 rpm don't match up:

7500 RPM * Number_of_cyl / 60Seconds =

You need a flip-flop to know whether this is an even or an odd pulse.

I don't remember what your input pulse looks like. Just for fun, lets
assume that it either is or could be cleaned up into a square pulse. I'm
thinking like this:


---------- ----------
Input ---------- ------------- ----------
. . . .
--- --- --- .
Output ---------- ------- ---------- -----------------


Notice how the output gallops. Will this be a problem?



I'm sure others will find something wrong with this but here's my idea:

I call your cleaned up signal "IN"

Even vs odd ckt:

------------
! CD4013 !
! ----- !
--!D ! !
IN-----!> ! !
! Q/!---+--- EVEN to the rest of it
-----

See the CD4013's data *** about reset and set inputs. They need to be
grounded. Also ground the unused inputs of the other section.

Was a little while ago circuit

R1
IN ---/\/\/---+----- WAS to the rest of it
!
--- C1
---
!
GND

Out of pure laziness, I didn't give you actual R and C values. R is
going to be 10K .. 100K or so.


The rest of it:

CD4051
--------
EVEN-----!C !
WAS-----!B !
IN-----!A !
! Y!--------- OUTPUT
GND---!X0 !
VCC---!X1 !
VCC---!X2 !
GND---!X3 !
GND---!X4 !
VCC---!X5 !
GND---!X6 !
GND---!X7 !
--------

See the 4051's data *** for where the "INH", "VCC" and "GND" signals go.

--
--
kensmith@xxxxxxxxx forging knowledge

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