[K4RY] Direction Finder

[Kyle Owen]

Thanks, John, and good idea! I like the suggestion of the analog meter. I
may try to put it in a box or something; it would be
awfully unwieldy without one!

73,

Kyle

On Sat, Sep 15, 2012 at 6:38 PM, John Klingelhoeffer <wb4lnm at aol.com> wrote:

> Nicely done!
>
>  Allow me to make a suggestion based on experience:  It is *extremely*
> difficult for the human ear to hear a 'peak' or a 'null' in an audio tone's
> amplitude.  Two possible extensions to your project to overcome this:
>
>  The first is to take the audio output of the HT from the earphone jack,
> run it through a precision rectifier (op amp with diodes in the feedback
> loop) and then drive an analog meter movement with the filtered DC output.
>
>  Or, use the same precision rectifier to drive a voltage to frequency
> converter, so the output is a varying frequency audio tone rather than a
> varying amplitude (sort of like a theremin!).  Either should provide a
> better (and faster) null or peak indication than the ear.
>
>  73
>
>  John...
>
>
>
>
> -----Original Message-----
> From: Kyle Owen <kylevowen at gmail.com>
> To: k4ry <k4ry at eng.auburn.edu>
> Sent: Fri, Sep 14, 2012 9:36 pm
> Subject: [K4RY] Direction Finder
>
>  Hi all,
> I just finished my 555-based direction finder. It works too! It draws a
> constant 8.5mA during operation. I may increase the RC time constant, as
> the pitch is a bit high. On the other hand, it's very easy to hear.
> Attached are a few pictures. Let me know if you have any questions about
> it!
> Kyle
>
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>
>
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