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Manky Monkey Motors > Technical Section > Trike Tech > Frequency Calcs - Sanity check please
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Author Topic: Frequency Calcs - Sanity check please  (Read 3065 times)
andyrennison
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« on: May 20, 2013, 08:03:48 PM »
Can someone please do me a sanity check on my figures?

Reliant engine, there are 2 sparks per single revolution of the engine, yes??

If so 3000 rpm = 3000 / 60 revolutions per second = 50 revolutions / second = 100 sparks per second

THEREFORE a digital tachometer can expect an input of 100 Hz at 3000 rpm ??

Have I got this right guys?

The reason I ask is I want to set up the digital tacho I have built. I can feed it known frequencies from my computer for calibration, but I want to get the frequencies right Cheesy:D:D
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ROD
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« Reply #1 on: May 20, 2013, 08:11:26 PM »
Sorry,you lost me there. My digi tacho only needed setting for 4 cyls,and it worked.
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Olds
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« Reply #2 on: May 20, 2013, 08:45:46 PM »
Logic seems fine to me.
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andyrennison
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« Reply #3 on: May 20, 2013, 08:54:21 PM »
Cheers ON, it is 2 firings per revolution then - that's the bit I wasn't sure about Smiley . Rod, I built the electronics for the tacho using a frequency to voltage convertor, and a bar graph driver chip, so it really is "home built" Smiley
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Manky Monkey
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« Reply #4 on: May 20, 2013, 08:55:20 PM »
...huh?
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andyrennison
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« Reply #5 on: May 20, 2013, 09:18:55 PM »
 Smiley Smiley Smiley
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Manky Monkey
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« Reply #6 on: May 20, 2013, 09:24:19 PM »
Does it have flashing lights?
I like flashing lights.  Tongue
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andyrennison
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« Reply #7 on: May 20, 2013, 09:29:37 PM »
Oh yes, in a circle round the outside of the clock Smiley
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morrag
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« Reply #8 on: May 20, 2013, 10:15:16 PM »
Well, that's alright then........................... Huh Huh Huh Huh Huh Huh Huh
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