Difference between revisions of "Frequency Counter"
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* Inexpensive plastic case | * Inexpensive plastic case | ||
** Plastic Waterproof Cover Electronic Project Instrument Enclosure DIY Box Case Junction Box Housing 100 x 60 x 25 mm Black | ** Plastic Waterproof Cover Electronic Project Instrument Enclosure DIY Box Case Junction Box Housing 100 x 60 x 25 mm Black | ||
| − | * [https://www.aliexpress.com/item/32833340145.html?spm=a2g0o.productlist.0.0.68406390LYz5Rw&algo_pvid=0bbf736e-a88e-4ac7-9adc-03df1259669a&algo_expid=0bbf736e-a88e-4ac7-9adc-03df1259669a-0&btsid=0bb0622a16017274930362968ef528&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ BNC connector - chassis mount] | + | * [https://www.aliexpress.com/item/32833340145.html?spm=a2g0o.productlist.0.0.68406390LYz5Rw&algo_pvid=0bbf736e-a88e-4ac7-9adc-03df1259669a&algo_expid=0bbf736e-a88e-4ac7-9adc-03df1259669a-0&btsid=0bb0622a16017274930362968ef528&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ BNC connector - female chassis mount] |
* 5.1mm Chassis mount power connector | * 5.1mm Chassis mount power connector | ||
** 7-9V in | ** 7-9V in | ||
Revision as of 12:20, 3 October 2020
Features
- Original Design by DL4YHF
- 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
- 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
