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:

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:

Have you seen this Tachometer Kit?

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

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