Hello everybody,

I'm a belgian student in engineering and I need your help for an electronic project. I've built a circuit with Shift lights and tachometer for a 4-cylinder engine. Everything is all right but how the LM331 works as a frequency to voltage converter ? Can you explain me that (if possible in french) ?

Here is a scheme of the LM311 :

Here is my circuit :

Thanks for your answer

I'm a belgian student in engineering and I need your help for an electronic project. I've built a circuit with Shift lights and tachometer for a 4-cylinder engine. Everything is all right but how the LM331 works as a frequency to voltage converter ? Can you explain me that (if possible in french) ?

Here is a scheme of the LM311 :

Here is my circuit :

Thanks for your answer

Last edited by a moderator: