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Tools for measuring rpm (revolutions per minute) of a rotating device

Easiest Solutions

Bicycle Speedometer

http://groups.yahoo.com/group/Bedini_SG/message/215

You can also use a digital bicycle speedometer and do the math for the

diameter of your wheel.

Mark Hayton

mark_hayton@hotmail.com

When magnets are involved

When you have magnets involved in your rotating device, a magnet-based tachometer will most likely not work because the magnets in your system will drown out the magnet of the tachometer (e.g. in a bicycle speedometer).

Optical Tachometer kits

http://groups.yahoo.com/group/Bedini_SG/message/215

There are Optical Tachometer kits for $28, you might be able to get them

cheaper if you look around, or there may be a circuit diagram that it posted

to build it from scratch.

Here is the link to a kit..

http://www.oatleyelectronics.com/kits/k117.html

Also I bought an optical tachometer on eBay for $50, so that is a source as

well.

Mark Hayton

mark_hayton@hotmail.com

Laser Tachometer

http://groups.yahoo.com/group/Bedini_SG/message/218

I recently purchased a Laser Tach for $49 from Marlin P Jones. I like it very much.WWW.mpja.com , Tel 541-848-8236

Gerhardt

{| border=1

| 15160 TE|| LASER DIGITAL TACHOMETER

Hand held photo reflective tachometer uses LASER beam. 5 digit LCD display measures RPM from 2.5-99,999. Resolution: .1RPM /2.5-999, 1RPM/above 1000. ... Requires reflective area on a non reflective surface. $49.00

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| 15161 TE

|| DIGITAL PHOTO TACHOMETER

Hand held photo reflective tachometer. 5 digit LCD display measures RPM from 5-99,999 with auto range select. Resolution: .1RPM