ESP32 CW Transmitter
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- Опубликовано: 22 июл 2024
- Just a quick video today where I build a simple ESP32/si5351 based CW transmitter using a trio of BS170s in the finals. I am assuming most people aren't interested in a code walkthrough - let me know in the comments if you are interested in the code.
Here is the schematic and code
github.com/thaaraak/ESP32-CW
Here's the site I used to create the low pass filter
rf-tools.com/lc-filter/
I got the debounce code from this reference.
github.com/craftmetrics/esp32...
0:00 Intro
0:24 Schematic Walkthrough
3:22 Walkthrough of the board
4:49 Waveform on the oscilloscope 
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Nice demonstration,will be trying the same 👍
Thank you Faizal - good luck with your build!
Bloody brilliant Ian ... we must have had the same thing for breakfast (Vegemite on toast?) as I'm working on a very similar project. I'm leaning heavily on the QCX manual that has heaps of info and references. The inductance of the loading coil seems to be "critical" to get max class E efficiency. I'm hoping to get closer to 5W and running QRP. As always thanks heaps for your videos as they are always relevant and interesting. As for the code, I've written my own and have incorporated a simple keyer with all the appropriate timing. My MCU is a Pro Mini ... starting to run out of pins LOL.
Thank you Neville . Like I mentioned I am going to play around with the input impedance of that LPF and see where I can get the output to. I am running about .5 A through the 3 BS170s together right now so there's still some room to go. Glad you enjoyed!
I redid the test using a 30ohm/50ohm impedance LPF drive.google.com/file/d/1chieY_cBfhPB1my2w2B34FxULkMGBY_T/view?usp=sharing
Now I get around 3.75 watts output
Nice work Neville and Ian, two of my favourite QRP homebrewers! 😊 Would be interested to see if your design works higher, say 30, then 20m.
Nice video...always find these design and prototyping radio vids fascinating! 73 de KN4FTT
Glad you enjoyed the video! 73s
why did you use the 7402 buffer? cant the esp32 drive a fet directly? (IOh=40 mA) or was it to get 5V drive?
Its the si5351 that can't drive the FETs directly. Maximum of 8mA I believe on high drive for the si5351. Thats my understanding anyway.