PING: Robert Dee

Ed,

You may want to look at the work of one of our own:

Trexon.com

Kevin Gallimore

--Went there but couldn't find anything relevant. I'm looking for a low-speed tachometer with a Hall effect sensor.

Let us know if you find something cheap. I've been looking for something like this to use on my lawnmower. Already have a big ole magnet spinning around on the flywheel, just need something to read it cheaply.

--Well I've started buying parts for Plan B, which is described here:

--Won't get parts together until after the steamboat meet but I'm buying enough to build a few. I've got a pile of Stamps so that part is easy..

You gave me a thought. My Fluke 117 reads frequency. I wonder if a wrap or two around the spark plug wire would be enough for it to register?

Currently my meter is at work and I'm waiting for a blade adaptor since mine is cracked or I'd be telling you how it worked out.

Wes

-- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller

well, for whomever originally wanted some thing - it just dawned on me that I have the "speedometer" pulled off of an exercise bicycle that is exactly what you want - still works

if you want it ping me off the list (get my email form my web page,

)

oh, and I wouldn't put the fluke's input near the HT plug wire - that's a good way to turn your fluke into a brick

I was thinking of using a shunt resistor.

Wes

cracked or

My Fluke can read frequency too, but at ~$300 it ain't the cheapest way to go. Would probably work okay for testing and such though. Just hook on to the alternator output and divide the measurement appropriately.

I want something cheap to display the RPM while mowing. I've got horsepower plus, only need to run it fast enough to get a decent cut. Even at maybe 3/4 throttle I can't hear the motor hesitate a bit in the deepest grass going full out. If I could see the RPM it would be a lot easier to duplicate the sweet spot where it cuts good enough for me.

For ~$40 you can get one of these:

Which is about the easiest and cheapest solution I've seen. May eventually get one, was hoping to pay even less though. Already have an hour meter, really just want the tach.

Have you seen this Tachometer Kit?

"Digital Tachometer Kit -- This tachometer can be adapted to any gasoline car or motorcycle engine. It differs from conventional tachometers, the analog hand is replaced with two seven segment led's. Only one simple and single adjustment is needed to calibrate the circuit for full linear scale. The brightness of the LED's is also adjustable

Specifications: Main Board: L: 3-1/8" W: 2-3/8" H: 3/4" Display Board: L: 2-1/8" W: 1-3/4" H: 3/4" Face Plate: L: 3-5/8" W: 2-3/4" H: Thin Requires 10-15VDC @ 200mA power supply. (Need a Power Supply?) Range 100 to 9900 RPM (resolution 100 rpm) Displays in 100's or 1000's of RPM

1/2 " Seven Segment LED display. Easy Calibration. PVC Front Plate Included.

VEK2625 - Digital Tachometer Kit - $42.95"

is cracked or

Google on "tinytach" they make a small tachometer for gasoline or diesel engines. I have a couple and they work as advertized. I believe that the gasoline model is $39.00