[GreenKeys] calibrating speed on a 14 and 15

[Dave G4UGM]

I use a strobe that some one built for me. It uses a 555 timer and power FET
to flash a small LED torch. It has a pot that allows the frequency to be
varied.

Its very effective at aligning machines to each other. When I want to check
speed I use the counter from here:-

http://techmind.org/audio/index.html

and connect the output from the strobe to the line-in on my PC via a small
capacitor.

Dave
(p.s. google for "NE555 LED Strobe" for more options)

> -----Original Message-----
> From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf
> Of Richard Knoppow
> Sent: 24 September 2016 20:27
> To: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] calibrating speed on a 14 and 15
> 
>      Could not some other method than a tuning fork be used?  I am not at
all
> familiar with the calibration procedure but it seems to me that an audio
> oscillator and counter could be used, or if its visual could be used to
trigger a
> stroboscope.  This is providing the correct frequency is known which I
> suppose it is.
> 
> On 9/24/2016 2:34 AM, simon wrote:
> > Hi all,
> >
> > as I have two machines that are in need of speed calibration and lack
> > the tuning fork but have a abundant amount of Arduino's, oscilloscopes
> > and frequency generators at my disposal, what rpm are the motors
> > supposed to run on. Of course these are the governed motors with the
> > speed changing wheel in the external interrupter part.
> >
> > there are white and black blocks on the outside.
> >
> > I remeber reading about a electronic speed control someone build, but
> > I am unable to locate the info.
> >
> > Besides that, I am working on a ESP8266 to heavy metal box, so that
> > our beloved machines can connect to Wifi and do all kinds of stuff.
> > the Software Library used just passed sending serial 50 baud tests.
> > Now I am working on receiving part. Then finally do the internet part,
> > but as that part is already done by someone else, i merely need to
> > wite the right calls to the library for that. Then I will be able to
> > attach the machine to IRC , twitter, whatsapp (if available) and maybe
> itelex.
> >
> > but first the speed issue...
> 
> --
> Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL
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