LED bar graph Tach

[audioguru]

The middle LED should be a fan to blow away the smoke from the over-rev'd engine. :lol:

 

[musthave]

no have it set up with electrodes conected to the bottom of the seat so he doesnt do it again. :lol: :twisted:

 

[Klaus]

I think this is what he means
**broken link removed**
did any one saw the circuit previously posted would that work at a fast speed .

Thanks, a pic beats words any time :wink:
Its novel, nothing like I imagined, just a fancy display and not actually telling the RPM's to some useful accuracy.
Klaus

 

[gbyzf1000]

Good morrning freaks :twisted:
ty for all of yr responces.

one query...is any way to extend the range up to 12-13.000 RPM?..
I would like to use it on- 4 stroke 4 cyl- motorcycle engine.... :roll:

 

[Nigel Goodwin]

Good morrning freaks :twisted:
ty for all of yr responces.

one query...is any way to extend the range up to 12-13.000 RPM?..
I would like to use it on- 4 stroke 4 cyl- motorcycle engine.... :roll:

These types of tachometers use a frequency to voltage converter (a 555 is actually a very common example!), all you need to do is alter the range of the converter - a simple capacitor or resistor change.