[Milsurplus] Crystal tester

Sat Aug 10 22:52:13 EDT 2019

Ohhhh, but we still have to tune the darned resistor.  Maybe just a multiposition switch & fixed values is simplest after all.  I'm hoping to put an el cheapo little meter on the output with a sensitivity pot to keep from pinning it maybe.

WayneWB4OGM

-----Original Message-----
From: Hubert Miller <Kargo_cult at msn.com>
To: milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>
Sent: Sat, Aug 10, 2019 8:45 pm
Subject: Re: [Milsurplus] Crystal tester

#yiv2331979855 #yiv2331979855 -- _filtered #yiv2331979855 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv2331979855 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv2331979855 {font-family:Consolas;panose-1:2 11 6 9 2 2 4 3 2 4;} #yiv2331979855 #yiv2331979855 p.yiv2331979855MsoNormal, #yiv2331979855 li.yiv2331979855MsoNormal, #yiv2331979855 div.yiv2331979855MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;} #yiv2331979855 a:link, #yiv2331979855 span.yiv2331979855MsoHyperlink  {color:blue;text-decoration:underline;} #yiv2331979855 a:visited, #yiv2331979855 span.yiv2331979855MsoHyperlinkFollowed {color:purple;text-decoration:underline;} #yiv2331979855 pre {margin:0in;margin-bottom:.0001pt;font-size:10.0pt;} #yiv2331979855 p.yiv2331979855msonormal0, #yiv2331979855 li.yiv2331979855msonormal0, #yiv2331979855 div.yiv2331979855msonormal0 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;} #yiv2331979855 span.yiv2331979855HTMLPreformattedChar {font-family:Consolas;} #yiv2331979855 p.yiv2331979855msonormal0, #yiv2331979855 li.yiv2331979855msonormal0, #yiv2331979855 div.yiv2331979855msonormal0 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;} #yiv2331979855 p.yiv2331979855msonormal, #yiv2331979855 li.yiv2331979855msonormal, #yiv2331979855 div.yiv2331979855msonormal {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;} #yiv2331979855 p.yiv2331979855msochpdefault, #yiv2331979855 li.yiv2331979855msochpdefault, #yiv2331979855 div.yiv2331979855msochpdefault {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;} #yiv2331979855 span.yiv2331979855msohyperlink {} #yiv2331979855 span.yiv2331979855msohyperlinkfollowed {} #yiv2331979855 span.yiv2331979855htmlpreformattedchar {} #yiv2331979855 span.yiv2331979855emailstyle22 {} #yiv2331979855 p.yiv2331979855msonormal1, #yiv2331979855 li.yiv2331979855msonormal1, #yiv2331979855 div.yiv2331979855msonormal1 {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;} #yiv2331979855 p.yiv2331979855msonormal2, #yiv2331979855 li.yiv2331979855msonormal2, #yiv2331979855 div.yiv2331979855msonormal2 {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;} #yiv2331979855 span.yiv2331979855msohyperlink1 {color:blue;text-decoration:underline;} #yiv2331979855 span.yiv2331979855msohyperlinkfollowed1 {color:purple;text-decoration:underline;} #yiv2331979855 p.yiv2331979855msonormal01, #yiv2331979855 li.yiv2331979855msonormal01, #yiv2331979855 div.yiv2331979855msonormal01 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;} #yiv2331979855 p.yiv2331979855msonormal02, #yiv2331979855 li.yiv2331979855msonormal02, #yiv2331979855 div.yiv2331979855msonormal02 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;} #yiv2331979855 span.yiv2331979855htmlpreformattedchar1 {font-family:Consolas;} #yiv2331979855 span.yiv2331979855emailstyle221 {font-family:sans-serif;color:windowtext;} #yiv2331979855 p.yiv2331979855msochpdefault1, #yiv2331979855 li.yiv2331979855msochpdefault1, #yiv2331979855 div.yiv2331979855msochpdefault1 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;} #yiv2331979855 span.yiv2331979855EmailStyle37 {font-family:sans-serif;color:windowtext;} #yiv2331979855 span.yiv2331979855EmailStyle38 {font-family:sans-serif;color:windowtext;} #yiv2331979855 .yiv2331979855MsoChpDefault {font-family:sans-serif;} _filtered #yiv2331979855 {margin:1.0in 1.0in 1.0in 1.0in;} #yiv2331979855 div.yiv2331979855WordSection1 {} #yiv2331979855 Wayne, you're free to run with that idea and reap the glory. I think not hard to find such a cap at a hamfest or out of some old VHF equipment. Then measure the capacity and make a dual – labeled dial, with capacitance and approx freq range of crystal. 
Now we need also to add a 10-LED bar graph to the output, to indicate relative output. -Hue    >oooohhhh.... I LIKE that idea and I'm jealous that I didn't think of it first.  :-)

Thanks for mentioning that!     Wayne WB4OGM -----Original Message-----
From: Hubert Miller <Kargo_cult at msn.com>
To: milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>
Sent: Sat, Aug 10, 2019 8:35 pm
Subject: Re: [Milsurplus] Crystal tester Thanks, Wayne.
It occurred to me that in this circuit, the 2 capacitors could maybe even be replaced by a 2-gang variable of low capacitance. -Hue   >I remember encountering that CMOS design but if I recall correctly the text that was with it indicated C1 & C2 & Rs had to be selected for the xtal range to be used. https://www.electronics-tutorials.ws/wp-content/uploads/2018/05/oscillator-osc32a.gif   I haven't given that one a breadboard try yet.

Wayne WB4OGM ______________________________________________________________
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