Frequency Counter

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Revision as of 12:17, 3 October 2020 by Blwikiadmin (talk | contribs) (→‎Case)
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FreqXounter-Kit-Assembled-02.PNG

Features

Case

  • P-Touch white on black labels

FreqCounterLabels.jpg

  • Inexpensive plastic case
    • Plastic Waterproof Cover Electronic Project Instrument Enclosure DIY Box Case Junction Box Housing 100 x 60 x 25 mm Black
  • BNC connector
  • 5.1mm Chassis mount power connector
    • 7-9V in

Rework - Add Pre-Amp

  • Based on

  • Uses extra transistor that would have been used by crystal tester oscillator
  • Pre-Amp schematic

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

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