Difference between revisions of "Frequency Counter"
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* [https://www.qsl.net/dl4yhf/freq_counter/freq_counter.html Original Design] by DL4YHF | * [https://www.qsl.net/dl4yhf/freq_counter/freq_counter.html Original Design] by DL4YHF | ||
| + | ** [https://owenduffy.net/blog/?p=11386 DL4YHF 50MHz counter on a Chinese TB-244746 PCB] | ||
* Frequency range: 1 Hz-50 MHz | * Frequency range: 1 Hz-50 MHz | ||
* Crystal Test Range: 4 MHz-48 MHz - Replaced with pre-amp circuit | * Crystal Test Range: 4 MHz-48 MHz - Replaced with pre-amp circuit | ||
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* 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 | * 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 | ||
* [https://github.com/TheHWcave/PIC-freq.counter-modification/ PIC-freq.counter-modification] | * [https://github.com/TheHWcave/PIC-freq.counter-modification/ PIC-freq.counter-modification] | ||
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== Case == | == Case == | ||
Revision as of 12:23, 3 October 2020
Features
- Original Design by DL4YHF
- Frequency range: 1 Hz-50 MHz
- Crystal Test Range: 4 MHz-48 MHz - Replaced with pre-amp circuit
- PCB size：8*5.3cm
- Sourced AliExpress Frequency Counter - Very inexpensive
- PIC-freq.counter-modification
Case
- P-Touch white on black labels
- 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
- 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
