Published By
Created On
18 Jul 2020 08:18:49 UTC
Transaction ID
Cost
Safe for Work
Free
Yes
Tinypico Radio Part 11 - Microphone Amp
In this video I pull together an electret based microphone amplifier. Here's the schematic
https://github.com/thaaraak/Tinypico-Radio/tree/master/kicad/Microphone%20Amp
More details on the use of electret mics can be found here:
https://mynixworld.info/2017/09/01/simple-electret-microphone-circuit/
Here's a link to a great post on the eevblog forums on how to set up Bode Plot on the siglent
https://www.eevblog.com/forum/testgear/siglent-sds1x04x-e-bodeplot-ii-(sfra)-features-and-testing-(coming)/
...
https://www.youtube.com/watch?v=unRe5Pc66-g
https://github.com/thaaraak/Tinypico-Radio/tree/master/kicad/Microphone%20Amp
More details on the use of electret mics can be found here:
https://mynixworld.info/2017/09/01/simple-electret-microphone-circuit/
Here's a link to a great post on the eevblog forums on how to set up Bode Plot on the siglent
https://www.eevblog.com/forum/testgear/siglent-sds1x04x-e-bodeplot-ii-(sfra)-features-and-testing-(coming)/
...
https://www.youtube.com/watch?v=unRe5Pc66-g
Author
Content Type
Unspecified
video/mp4
Language
Unspecified
More from the publisher
Controlling
VIDEO
QCX T
qcx-transceiver-part-3-phase-shift
In this video the Phase Shift network is installed. Then a simulated upper side band signal (I leading Q by 90 degrees) and lower side band signals are injected. The results are displayed on the oscilloscope
I decided to go ahead and install the 500 ohm IQ Balance pot which also completes the audio path and the simulated upper and lower sideband signals can be heard.
The book Experimental methods in RF design devotes a whole chapter to Phasing radios (Chapter 9). The phase shifter in the QCX is derived from the one in the Norcal NC2030
http://www.norcalqrp.org/nc2030.htm
...
https://www.youtube.com/watch?v=ospWB-Cj2fc
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
QCX T
qcx-transceiver-part-4-the-bandpass
In this video I wind transformer T1 and install the bandpass filter. After that I inject a signal into the primary and examine the results at the splitter
...
https://www.youtube.com/watch?v=KYSUznerpZM
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
NORCA
norcal-sierra-part-7-receive-mixer
In this video we complete the receive circuitry and get the radio on the air
LC Resonance Calculator: https://www.daycounter.com/Calculators/LC-Resonance-Calculator.phtml
...
https://www.youtube.com/watch?v=rHNwuYBfW7Y
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
SDR T
sdr-transceiver-part-1-overview-and
In this series I will combine the Receiver and Transmitter into a single transceiver with transmit/receive switching
Here's the schematic (incomplete as of posting - will continue to build on it)
https://github.com/thaaraak/SDR-Transceiver
Here's the datasheet for the FST3257
https://www.onsemi.com/download/data-sheet/pdf/fst3257-d.pdf
Here's the relays
https://www.ebay.com/itm/291762418219
0:00 Walkthrough of transceiver block diagram
1:53 RF Switch and Audio Switch highlights
2:41 Receive Path
4:45 Transmit Path
6:28 Audio Switch Details
7:41 FST3257 Datasheet walkthrough
8:58 Audio Switch implementation
10:18 Audio Switch testing
11:07 Audio Switch on the breadboard
15:43 RF Switch schematic
17:51 Relays that will be used
18:34 Wrapup and next steps
...
https://www.youtube.com/watch?v=d4cmGwFpQcw
Transaction
Created
1 year ago
Content Type
Language
video/mp4
English
Controlling
VIDEO
YET A
yet-another-amplifier-20m-5w-irf510-ssb
In this quick video I walk through a 5W amplifier I built up based on this one from QRPGuys
https://qrpguys.com/wp-content/uploads/2019/08/miniboots_assy_052919.pdf
The github repo with the kicad and ltspice files is here
https://github.com/thaaraak/IRF510-Amplifier-v2
The schematic is here:
https://github.com/thaaraak/IRF510-Amplifier-v2/blob/main/IRF510-Amplifier.pdf
Gerber files here
https://github.com/thaaraak/IRF510-Amplifier-v2/tree/main/gerber
A technical article on Harmonic Trap filters is here:
https://www.internationaljournalssrg.org/IJEEE/2016/Volume3-Issue9/IJEEE-V3I9P102.pdf
0:00 Intro
0:33 Circuit walkthrough
2:49 Simulation of Filter in LTSpice
3:49 Pre-amp walkthrough
4:52 Walkthrough of Board
6:35 Some simple testing
7:57 Having a look at linearity with an AM signal
9:45 Wrap up
...
https://www.youtube.com/watch?v=D4UhOmum_oU
Transaction
Created
1 year ago
Content Type
Language
video/mp4
English
Controlling
VIDEO
ESP32
esp32-iot-radio-part-3-web-interface
In this video I build up the web interface to the radio which controls the si5351 Frequency Synthesizer:
Code for the ESP32 is here
https://github.com/thaaraak/ESP32-WebServer
The React.js UI code is here
https://github.com/thaaraak/ESP32-Radio-js
The previous video I did explaining the si5351 is here
https://www.youtube.com/watch?v=2cb1LLoeT-Y
The ESP-IDF WiFi and web server example code is here
https://github.com/espressif/esp-idf/tree/c13afea635adec735435961270d0894ff46eef85/examples/wifi/getting_started/station
https://github.com/espressif/esp-idf/tree/c13afea635adec735435961270d0894ff46eef85/examples/protocols/http_server/file_serving
SPIFFS and Partition table Description
https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/storage/spiffs.html
https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/partition-tables.html
The React.js tutorial is here
https://reactjs.org/tutorial/tutorial.html
0:00 Intro
0:25 High level design
1:45 Demo using URI
3:55 Demo using React.js UI
6:30 Same code running on the phone
7:47 Recap on si5351 (see videos above for more detail)
9:48 ESP-IDF Wifi and Hostname setup
12:20 ESP-IDF Web server setup
16:30 Using SPIFFS for static content store on the ESP32
17:47 Partition setup for SPIFFS
20:05 React.js for the user interface (see tutorial above)
23:23 Wrap up
...
https://www.youtube.com/watch?v=vWI5CHoxLDo
Transaction
Created
1 year ago
Content Type
Language
video/mp4
English
Controlling
VIDEO
ENSEM
ensemble-rxtx-build-4-quadrature
A great explanation of the D-type flip flops configured for quadrature
https://www.youtube.com/watch?v=OL52f-k3iIE&t=435s
The binocular core
https://toroids.info/BN-43-2402.php
The D-type flip flop 74AC74 datasheet
http://www.mouser.com/ds/2/149/74AC74-17555.pdf
...
https://www.youtube.com/watch?v=XTijnwyi5CI
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
DSP W
dsp-with-nucleo-144-f767-part-1
In this video I do some nuts and bolts I2S, DMA and ultimately DSP on the Nucleo-144 F767 board.
Huge thank you to "YetAnotherElectronicsChannel" series of DSP videos:
https://www.youtube.com/channel/UCwOkALY6oQbOL1zU7ApaPHg
This is the board I am using:
https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-mpu-eval-tools/stm32-mcu-mpu-eval-tools/stm32-nucleo-boards/nucleo-f767zi.html
The PMod I2S2 board:
https://store.digilentinc.com/pmod-i2s2-stereo-audio-input-and-output/
SMTCubeIde link (free download)
https://www.st.com/en/development-tools/stm32cubeide.html
CMSIS Library (look for the ""pack" file):
https://github.com/ARM-software/CMSIS_5/releases
The code
https://github.com/thaaraak/F7-DSP
A link to the microphone amplifier circuit I built up
https://www.youtube.com/watch?v=unRe5Pc66-g&t=1s
Timecodes:
0:00 Intro
4:40 I2S background
6:54 PMod I2S2 Audio Board
9:15 Connections between PMod and Nucleo
13:27 STMCube
23:06 The code
31:11 Double Buffering
42:37 The Passthru Test
...
https://www.youtube.com/watch?v=jvmejxsQzn4
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
SHERI
sheridan-on-the-vive
...
https://www.youtube.com/watch?v=mytY82_vtRI
Transaction
Created
1 year ago
Content Type
Language
video/mp4