Difference between revisions of "Frequency Counter"

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* PCB size:8*5.3cm
 
* PCB size:8*5.3cm
 
** Fits in 100 x 60 x 25 mm enclosure
 
** Fits in 100 x 60 x 25 mm enclosure
* Sourced [https://www.aliexpress.com/item/4001262793719.html?spm=a2g0o.productlist.0.0.a6a57b558PTLGq&algo_pvid=77bddd5c-6ae2-4082-8837-73945f792fae&algo_expid=77bddd5c-6ae2-4082-8837-73945f792fae-0&btsid=0bb0622f16000865130548256e846c&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ AliExpress Frequency Counter] - Very inexpensive
+
* Source - [https://www.aliexpress.com/item/4001262793719.html?spm=a2g0o.productlist.0.0.a6a57b558PTLGq&algo_pvid=77bddd5c-6ae2-4082-8837-73945f792fae&algo_expid=77bddd5c-6ae2-4082-8837-73945f792fae-0&btsid=0bb0622f16000865130548256e846c&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ AliExpress Frequency Counter] - Very inexpensive
 
* [https://github.com/TheHWcave/PIC-freq.counter-modification/ PIC-freq.counter-modification]
 
* [https://github.com/TheHWcave/PIC-freq.counter-modification/ PIC-freq.counter-modification]
  

Revision as of 12:24, 3 October 2020

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 - female chassis mount
  • 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