[K4RY] Direction Finder

[John Klingelhoeffer]

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 
 
_______________________________________________
K4RY mailing list
K4RY at mailman.eng.auburn.edu
http://mailman.eng.auburn.edu/mailman/listinfo/k4ry
http://www.auburn.edu/student_info/k4ry/au_k4ry.html

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.eng.auburn.edu/pipermail/k4ry/attachments/20120915/6eaaceff/attachment.htm