Difference between revisions of "Frequency Counter"

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Line 12: Line 12:
 
* Uses extra transistor that would have been used by crystal tester oscillator
 
* Uses extra transistor that would have been used by crystal tester oscillator
  
== Case ===
+
== Case ==
  
 
* P-Touch white on black labels
 
* P-Touch white on black labels
  
[[File:]FreqCounterLabels.jpg]
+
[[File:]FreqCounterLabels.jpg]]
  
 
[[File:FreqCounter_PreAmp_Schematic.PNG]]
 
[[File:FreqCounter_PreAmp_Schematic.PNG]]

Revision as of 11:55, 3 October 2020

FreqXounter-Kit-Assembled-02.PNG

Rework - Add Pre-Amp

Case

  • P-Touch white on black labels

[[File:]FreqCounterLabels.jpg]]

FreqCounter PreAmp Schematic.PNG

  • When building kit, do not install

FreqCounter DoNotInstallParts.PNG

  • Front side cuts - blue
  • Jumpers Red

FreqCounter Rework PCB Front.PNG

  • Back side cuts

FreqCounter Rework PCB Back.png

FreqCounter Rework-Cuts-Back.PNG

  • Details of preamp input pin

FreqCounter Rework-06.PNG

  • With parts

FreqCounter Rework-07.PNG

Testing

FreqCounter InCase.jpg

  • 4.9152 MHz crystal
  • Scope frequency counter shows 4.19520 MHz
  • Freq Counter displays 4.9747 MHz
  • Difference = 500 Hz or 0.1% accuracy
  • Can only adjust the variable capacitor in narrow range

Reviews / Builds