Eugoogoly

i am making a tachometer for my electronic engineering project (final year woohoo!) and was wondering if anyone has made one of these and can give me any ideas / tips for a starting point or knows of a forum that deals with this sort of thing.

Thanks

*Crash*Johnson*

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A Tach for an RC engine or for a car engine?

RC: Probably a hall sensor on the front of the crankshaft, and circuits that can count and decode that information

Car: Go to Autozone and buy one for 40 bucks.

MinnFlyer

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Hi Crash! I just read over at PorkRoll That you were done with RCU. Glad to see you came back

*Crash*Johnson*

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Bahhhh... Came back to see how many more thread were deleted and seen a poor soul who needed advice. Couldn't help but try to help out...
Darn it...I'm back again...

JNorton

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I've got a PDF file from an article on a phototachometer published by Electronic Design. It is their Janaury 25th, 1999 issue page 96 and 97. E-Mail me and I'll send it.

John

Eugoogoly

sorry should have phrased that clearer. Its for my airplanes. Im just trying to get as much info on them as i can to help me out.

John what is a phototachometer?

JNorton

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Uses light ie photo tachometer. This is the same as most hobby tachs, but with a much improved adaptive, low-contrast threshold circuit. I probably should have split the words. This is a very nice circuit but it has an analog ie meter not a digital display.

John

JNorton

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Eugoogoly,
E-mailed you the pdf file. Hope you enjoy it. It is an interesting circuit.
John

Eugoogoly

Thanks John. Only just got on the internet tonight, been putting finishing touches to my plane. From what i did read from the pdf file it does look very useful.

JNorton

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Eugoogoly,
Send me a picture if you build it. Thanks,
john