Sigma-delta fully digital musical Tesla Coil
RoV IW3IPD, Sun Jul 19 2020, 09:03AMHi,
this is my 4th Tesla Coil, but it's the first time that I post on 4HV.
What I have built is a small musical Tesla but, if I'm not wrong, containing some innovation.
Generation of CW waveform is quite standard, with a MOSFET half bridge and doubly resonant architecture, but modulation scheme is based on a variation of sigma-delta modulation, which is carried on in software inside an ESP32 embedded module, with output on the I2S device. Sigma-delta modulation is used to drop driving cycles and hence get modulation of the output.
I have just posted an article here to describe the project: *
The ESP32 firmware doing the coding is stored here: *
Here is a video in operation:
Roberto
IW3IPD
Re: Sigma-delta fully digital musical Tesla Coil
Patrick, Sun Jul 19 2020, 08:30PM
this is amazing. first rate effort. im trying to use that same WiFi module but dont know how.
Patrick, Sun Jul 19 2020, 08:30PM
this is amazing. first rate effort. im trying to use that same WiFi module but dont know how.
Re: Sigma-delta fully digital musical Tesla Coil
RoV IW3IPD, Sun Jul 19 2020, 09:13PM
Patrick, the ESP32 is quite easy to use with Arduino IDE and libraries, particularly for Wi-Fi.
For this project I had to use the Expressif SDK, which is a bit more complex, because I needed more flexibility for I2S and because there was a demo for Bluetooth to start with.
Roberto
RoV IW3IPD, Sun Jul 19 2020, 09:13PM
Patrick wrote ...
im trying to use that same WiFi module but dont know how.
im trying to use that same WiFi module but dont know how.
Patrick, the ESP32 is quite easy to use with Arduino IDE and libraries, particularly for Wi-Fi.
For this project I had to use the Expressif SDK, which is a bit more complex, because I needed more flexibility for I2S and because there was a demo for Bluetooth to start with.
Roberto
Re: Sigma-delta fully digital musical Tesla Coil
Patrick, Tue Jul 21 2020, 08:26PM
Is it possible to use the device as a "pin-to-pin-bridge" between two uC ?
Patrick, Tue Jul 21 2020, 08:26PM
Is it possible to use the device as a "pin-to-pin-bridge" between two uC ?
Re: Sigma-delta fully digital musical Tesla Coil
RoV IW3IPD, Tue Jul 21 2020, 09:30PM
Patrick, I think this is a bit OT... there are many forums on ESP32. However, if I understand well your question, yes you can use it as a Wi-Fi or Bluetooth extender for another uC: you just need to code an intermediate protocol and drive I/O lines as you want.
RoV IW3IPD, Tue Jul 21 2020, 09:30PM
Patrick, I think this is a bit OT... there are many forums on ESP32. However, if I understand well your question, yes you can use it as a Wi-Fi or Bluetooth extender for another uC: you just need to code an intermediate protocol and drive I/O lines as you want.
Re: Sigma-delta fully digital musical Tesla Coil
Patrick, Wed Jul 22 2020, 01:00AM
i have the esp-12 / esp8266. it looks like a 28 pin dip board.
Patrick, Wed Jul 22 2020, 01:00AM
i have the esp-12 / esp8266. it looks like a 28 pin dip board.
Re: Sigma-delta fully digital musical Tesla Coil
Terry Fritz, Wed Jul 22 2020, 05:25AM
In my day, I used a Basic Stamp to control my DRSSTC...
But now, the chips are super powerful!!!
Also had to use fiber optic cables... But Bluetooth is super "noise" immune.
Born too early :D
Great work you are doing there!
Terry
Terry Fritz, Wed Jul 22 2020, 05:25AM
In my day, I used a Basic Stamp to control my DRSSTC...
But now, the chips are super powerful!!!
Also had to use fiber optic cables... But Bluetooth is super "noise" immune.
Born too early :D
Great work you are doing there!
Terry
Re: Sigma-delta fully digital musical Tesla Coil
Terry Fritz, Thu Nov 12 2020, 04:04AM
You need to turn off the sound from the phone and only play the coil's music...
Terry Fritz, Thu Nov 12 2020, 04:04AM
You need to turn off the sound from the phone and only play the coil's music...
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