Hello, after getting my innovate LM1 A/F logger, i would like to have RPM input in it to cross information. Problem is that the innovate rpm converter costs over 100€.. I know frequency to voltage chips are very cheap, and i hate when simple things are overpriced so i dont care if it takes some time (i am not stressed with time), i would like to build my own converter.
I have seen little but some documents on internet about this subject, one of wich -> http://forums.evolutionm.net/showthread.php?t=159682
But the info got "dead" with time so i need fresh knowledge. My LM1 input is from 0 to 5 volts, so i need to build a frequency to voltage with these parameters and accurate. The software i have displays gauges in real time, so i could verify with ease if my converter is accurate or not.. (at least to get an idea)
Someon built a converter like this or can help me with this ??
Thank you in advance
DIY Rpm to Voltage Converter
Moderators: daewoomofo, Moderators Group
Hi,
I've used the LM331 from fig 6 to make a cheap optical tacho. This chip can work both ways: F--->V and V--->F.
You just have to pick the correct signal somewhere.
http://www.national.com/pf/LM/LM331.html#Datasheet .
Daniel
I've used the LM331 from fig 6 to make a cheap optical tacho. This chip can work both ways: F--->V and V--->F.
You just have to pick the correct signal somewhere.
http://www.national.com/pf/LM/LM331.html#Datasheet .
Daniel