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18 Jul 2020 08:18:49 UTC
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Georgia at Cinnamon Creek
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Controlling
VIDEO
PYBOA
pyboard-stm32f4-radio
In this video I use the digital signal processing from the earlier video:
https://www.youtube.com/playlist?list=PLsMaN1bGWynysVNJgQ9jhQnYDfqz3-Cd8
and build a radio replacing opamps for phase shifting with DSP on the F4. The tayloe detector used is described here:
https://www.youtube.com/watch?v=iwBk3jIxszI
The code is up on github here:
https://github.com/thaaraak/PyboardRadio
The pyboard is available here
https://pyboard.org/
Note I am not using micropython but rather just flashing from STMCube with
https://www.amazon.com/gp/product/B01J7N3RE6/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1
The results were not as good as I had hoped. It looks like I damaged the Tayloe detector board and I wasn't getting the upper sideband suppression I had hoped. I will spin another board and post results
...
https://www.youtube.com/watch?v=I8ZwlgjXAZM
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1 month ago
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VIDEO
NORCA
norcal-sierra-part-5-receiver
Demo of the operation of RIt and a quick explanation
Comparator info here: http://www.learningaboutelectronics.com/Articles/LM393-comparator-circuit.php
Datasheet for MV2104 Varactor: http://pdf.datasheetcatalog.com/datasheet_pdf/leshan-radio-company/MV2105.pdf
...
https://www.youtube.com/watch?v=NsvMPVbmGqo
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video/mp4
Controlling
VIDEO
QRP L
qrp-labs-10w-further-measurements-and
This is a quick update from the original 10W Amp video:
https://www.youtube.com/watch?v=wBiz594O5LA
In this video I do a number of measurements varying both the input signal as well as supply voltage and graph the results with Python.
I also add a low pass filter design from this site and remeasure
https://rf-tools.com/lc-filter/
Finally I graph the result of increasing the DC bias to the BS170s
...
https://www.youtube.com/watch?v=JMlc5uohcm0
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Controlling
VIDEO
ESP32
esp32-based-sdr-transmitter-part-1-audio
In this new series I will be building and testing a low power SDR SSB Transmitter.
The schematics for the transmit mixer (work in progress) are here:
https://github.com/thaaraak/ESP32-Tayloe-Mixer
The code is here: (just PTT for the moment - more to come)
https://github.com/thaaraak/SDR-Transmitter
Original video:
https://www.youtube.com/watch?v=XySzNe7rXbk
Link for determining electret current
http://mynixworld.info/2017/09/01/simple-electret-microphone-circuit/
0:00 Intro
1:21 I/Q based transmitter block diagram
2:54 Schematic walkthrough for Transmit mixer
6:35 Board populated with supply, ESP32 and ES8388
7:58 Phase Shift testing
10:06 Arduino software walkthrough
11:49 Adding a low pass filter in software and retesting
13:41 Walkthrough of microphone and connections
15:33 Microphone preamp circuit
16:44 Microphone preamp board
17:24 Preamp board populated
17:59 Testing the preamp board on the oscilloscope
19:47 Connecting the microphone/preamp to the transmit mixer
21:06 Looking at the 0/90 degree shifted audio from microphone to oscilloscope
22:33 Wrap up and next video description
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https://www.youtube.com/watch?v=XdupkNW19kA
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Controlling
VIDEO
BEAR
bear-in-the-yard
...
https://www.youtube.com/watch?v=OWNZlhwdbOY
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video/mp4
Controlling
VIDEO
ESP32
esp32-a1s-with-arduino-audio-tools
This is a followup to my previous video
https://www.youtube.com/watch?v=bEPe8Pm1mdw&t=1s
In this video I continue to play around with the Arduino Audio Tools
https://github.com/pschatzmann/arduino-audio-tools
With a library I have put together for ES8388 codec support
https://github.com/thaaraak/es8388
And here is the codec support that comes with Arduino Audio Tools
https://github.com/pschatzmann/arduino-audiokit
The examples I showed are all here
https://github.com/thaaraak/es8388/tree/master/examples
0:00 Intro
1:51 Quick walkthrough of ES8388 Arduino library
2:33 Example 1: Generated Stream to I2S (streams-generator-i2s)
5:27 Example 2: I2S Input to I2S Output (streams-i2s-i2s)
7:20 Example 3: Generated Stream to Browser (streams-generator-webserver_wav)
9:34 Example 4: I2S Input to Browser (streams-i2s-webserver_wav)
13:34 Example 5: Audio to Bluetooth Receiver (basic_adp_sink)
15:50 Wrapup
...
https://www.youtube.com/watch?v=oqtkR2FRKYI
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VIDEO
ELECT
electroluminescent-slide-show
A viewer had asked me to give some up close shots of the connections on the Electroluminscent receiver I built a couple of years back. Here it is!
...
https://www.youtube.com/watch?v=G7ii1hzLgPk
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Controlling
VIDEO
QCX T
qcx-transceiver-part-2-power-cw-filter
In this video the power supply, the CW filter and the Audio Amplifier are put together and tested.
The CW filter is a derivative of the HI-PERMITE CW filter kit design by David Cripe NM0S a link to that design appears here:
http://www.4sqrp.com/HiPerMite.php
...
https://www.youtube.com/watch?v=sK3w3Ae6Jqg
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Controlling
VIDEO
SDR T
sdr-transceiver-part-7-new-board
As I mentioned in the last video I was awaiting a new board that I had redesigned. I build up the Tayloe detector and see if the redesign removes the audio artifacts I encountered last time
0:00 Intro and New Board walkthrough
1:50 Power Supply, ESP32 and Codec installed
2:51 si5351 Installed
3:12 Tayloe Detector installed and tested
4:22 Testing the SSB output (excuse the dirty scope - lots of pollen about!)
6:58 Looking at the unwanted sideband supression in dBs
10:03 Wrap up
...
https://www.youtube.com/watch?v=Kh6p49WP1ls
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Created
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English