Difference between revisions of "Frequency Counter"
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* Pre-Amp schematic | * Pre-Amp schematic | ||
* Based on https://www.youtube.com/watch?v=0BxpMm6SLoE | * Based on https://www.youtube.com/watch?v=0BxpMm6SLoE | ||
| + | * Uses extra transistor that would have been used by crystal oscillator | ||
[[File:FreqCounter_PreAmp_Schematic.PNG]] | [[File:FreqCounter_PreAmp_Schematic.PNG]] | ||
Revision as of 11:41, 3 October 2020
- Original Design
- AliExpress Frequency Counter - Very inexpensive
- PIC-freq.counter-modification
- DL4YHF 50MHz counter on a Chinese TB-244746 PCB
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 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
Reviews / Builds
