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From: Mark Borgerson
Subject: Re: frequency to voltage converter
X-Newsreader: MicroPlanet Gravity v2.50
NNTP-Posting-Date: Fri, 17 Jan 2003 17:51:14 GMT
Date: Fri, 17 Jan 2003 17:51:14 GMT
In article <firstname.lastname@example.org>, makara99
> i need a circuitry , which will build a speed signal from coming encoder pulses .
> for example i have a 2500 pulse encoder which is connected to a motor shaft.
> when the motor runs at 100 rpm - this makes 250000 pulses / second
Better check your math! 100 RPM x 2500 pulses/revolution = 250,000
Pulses/minute. This is 4167 pulses per second!
Each pulse lasts about 240 microseconds. What you need is a simple
one-shot with a 240 microsecond period, followed by a low-pass
filter. Shouldn't be too difficult with something like a 555 timer
> i need a IC which takes this pulses and builds a signal 0.5 V for example
> when the motor runs at 1000 rpm it will output 5 V.
Hey, we were at 100 RPM up above---which is it?
> as you can see it must be very linear.
> does anybody have an idea ?
> is there such a IC on the market ?
> or any other methods ?
> (i dont want to use a tacho becouse it costs money )
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