I would like to build tach for a small diesel. magnet, sensor, counter, LED

[Slimbo]

I would like to build a tach for a small diesell. Simple
magnet, pick up, counter LED readout. Is there schematics for this project?

 

[Arouse1973]

Did you Google at all?
http://www.electroschematics.com/451/digital-bike-tachometer/
Adam

 

[debe]

I know its not digital , but I made this for my Yanmar diesel engine in my boat & it works fine. Reed switches weren't mutch good as sensors so went for a hall device & a small magnet on crank pulley. The gauge was a salvaged tacho of another instrument panel I had laying around, & im only using the meter part of it,

 

[Colin Mitchell]

Please explain your set-up. How are you getting the "30" reading and what is the "coil" in the foreground?

 

[debe]

The coil was being fed 50hz power for calibration purposes, this was triggering the hall sensor and gave a reading of 3000rpm for a single pulse per revolution.

 

[Colin Mitchell]

That's the most important part of the set-up.

 

[Arouse1973]

I know its not digital , but I made this for my Yanmar diesel engine in my boat & it works fine. Reed switches weren't mutch good as sensors so went for a hall device & a small magnet on crank pulley. The gauge was a salvaged tacho of another instrument panel I had laying around, & im only using the meter part of it,

That's a good one debe, with the addition of an LM3914 and a few other components it would be able to drive a bar graph display.
Adam

 

[Gryd3]

That's a good one debe, with the addition of an LM3914 and a few other components it would be able to drive a bar graph display.
Adam

I've got a few of those kicking around.
In a half finished project to drive a bar-graph along the perimeter of my speedometer with rectangular LEDs

 

[Slimbo]

Thanks, it works great. And the bar display is better for reading at a glance, great idea. When it's installed and I'm confident of it, I'll post. It's a combination of all the above. Thanks, Slim