tachometer schematics pls

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hello all,

could anyone show me a schematic of a tachometer? in motorbikes.. I mean HOW/where do they get the SIGNAL.... and how do they convert it to RPM readings..

is the RPM meter switched by PWM? or is it some sort of an frequency meter?

thanks for any info..
 

Signals for tachometers can be pickedup in many different ways: wireless, hall sensosrs, optical sensors .. to name just a few ..
Here is one example that shows a magnetic pickup device .. see picture below ..

This signal cen be fed directly to almost any tachometer circuit .. here is one example: **broken link removed**

Regards,
IanP
 

oh ic...

well, my motorbike got magnetic pickup... with resistance of 150 ohms...
 

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