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'(OT) RPM/Speedo using instead analog F/V convertor'
1998\10\23@114505 by david schmidt

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FWIW, I've found it easier to make a speedo/RPM meter using
National Semiconductor's LM2907/LM2917 Frequency to Voltage converter.

You can hook up a magnetic pickup directly to the input of the IC
(differential
input) or using conditioning circuits, the negative lead of the coil.

The output is then a voltage that is linearly proportional to the input
frequency.  Hook this to the LM3914 10 LED bargraph IC and  you are done,
or use scaling resistors and a cheap 3-1/2 digit panel DMM for digital
output.

Don't have to worry about refresh rates, timebases, etc, and easily
calibrated.

Dave

1998\10\24@050104 by Morgan Olsson

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At 08:45 1998-10-23 -0700, you wrote:
>FWIW, I've found it easier to make a speedo/RPM meter using
>National Semiconductor's LM2907/LM2917 Frequency to Voltage converter.
>
>You can hook up a magnetic pickup directly to the input of the IC
>(differential
>input) or using conditioning circuits, the negative lead of the coil.
>
>The output is then a voltage that is linearly proportional to the input
>frequency.

If that cirquit use a capacitor for conversion, beware to select one thet
has little temp drift (som cap drifts are huge!)

/Morgan
/  Morgan Olsson, MORGANS REGLERTEKNIK, SE-277 35 KIVIK, SWEDEN \
\  spam_OUTmrtTakeThisOuTspaminame.com     ph +46(0)414 70741     fax +46(0)414 70331 /

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