"Franz Eckert" wrote in
. dk:

So what i need is a schematic that i can make a digital or analog
read out of the impulses from the flow sensor. And it would be nice if
it was not
Dependent on a notebook.



How about a cheap pulse counter?

http://private.addcom.de/KeithWilson/Projects/imco.htm
http://www.boondog.com/%5Ctutorials%5C8254%5C8254.htm

Any simple analog tachometer circuit could easily be recalibrated to be
used to count these pulses:
http://www.mindspring.com/~corvair/earlytach.html

This NE555 common timer IC schematic would be ideal!
http://www.electronics-tutorials.com...tachometer.htm
You didn't say how big the pulses are coming from the device. This circuit
converts any bigger-than-5V pulses to 5V with the zener on pin 2, If your
pulses are smaller, simply add a transistor amp to make them bigger on the
input where the points go. Take the scale out of the meter movement, paint
it white and make a new scale in litres/hour with your boat's maximum fuel
consumption about 90% of the scale. The 50K resistor and .1uF cap over the
meter sets the timing. Fool with those values to make it read your slower
pulses. You might want to add a big electrolytic cap right across the
meter if the meter pulses in so slow an application, smoothing it out. The
theory is on the page.



--
Larry