Low Freq Tachometer

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fode

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I'm designing a tachometer to measure a shafts rpm, using a freq-volt converter. the rpm can vary from 0-500. all the chips i have looked at have bottom end 10kHz pickup. can anyone suggest an alternative chip or method i could use?

these are the chips i have already looked at
AD537JH
AD650JH
AD602AQ
AD654JN
ADVFC32KN
LM231N
LM2917N-8
LM331N
MM74C922N
TC9400CPD
TC9401CPD
TC9402CPD
VFC32KP
VFC320BP

thanks
 
Hi fode,

You could try an old mechanical speedometer.
That sounds like about the sort of rev range.

Quite easy to find, very reliable, no supply needed.

Regards, John
 

A simple magnet/reed switch perhaps? Just like a bicycle speedometer?...
 
yeah., it depends on how you want to register a shaft rotation??
your best options are optical or magnetic
using a hall effect switch (and a magnet )produces a nice clean signal to count..
 
Don't forget about using a gear on the shaft with a magnetic coil-type sensor to sense the teeth on the gear. That way you get numerous pulses per revolution, instead of just a couple. Although, like williB said, a hall effect setup does give a nice clean signal ... but with a little bit of signal conditioning, the coil setup will too.
Here's a link to a thread where we discussed this previously ...
https://www.electro-tech-online.com/threads/how-to-measure-current-in-pic-pic-as-an-ammeter.10097/
Jeff
 
fode said:
I'm designing a tachometer to measure a shafts rpm, using a freq-volt converter. the rpm can vary from 0-500. all the chips i have looked at have bottom end 10kHz pickup. can anyone suggest an alternative chip or method i could use?
Click to expand...

A 555 timer in monostable mode would do the job, they are commonly used as rev counters.
 
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