Difference between revisions of "Frequency Counter"
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[[File:FreqXounter-Kit-Assembled-02.PNG]] | [[File:FreqXounter-Kit-Assembled-02.PNG]] | ||
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| + | == Features == | ||
* [https://www.qsl.net/dl4yhf/freq_counter/freq_counter.html Original Design] | * [https://www.qsl.net/dl4yhf/freq_counter/freq_counter.html Original Design] | ||
Revision as of 11:58, 3 October 2020
Features
- Original Design
- AliExpress Frequency Counter - Very inexpensive
- PIC-freq.counter-modification
- DL4YHF 50MHz counter on a Chinese TB-244746 PCB
Case
- P-Touch white on black labels
Rework - Add Pre-Amp
- Pre-Amp schematic
- Based on https://www.youtube.com/watch?v=0BxpMm6SLoE
- Uses extra transistor that would have been used by crystal tester oscillator
- When building kit, do not install
- Front side cuts - blue
- Jumpers Red
- Back side cuts
- Details of preamp input pin
- With parts
Testing
- 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
