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Topics - Zipdox
1
« on: July 01, 2021, 09:15:41 PM »
How stupid of an idea would it be to connect the MIDI output from multiplayerpiano.com to a tesla coil? Just thinking. If I can get my tesla coil reliable enough maybe I could do a livestream or something and let people play on it. If I feel like it I could even make a custom website for it. It reminds me of the David Blaine event with arcattack, although that was a bit different. Obviously there's the risk of people playing black MIDI or something to try and destroy the coil. Would have to try and mitigate that and do some testing. Let me know your thoughts.
2
« on: November 14, 2020, 12:02:14 AM »
I am kind of a music/recording guy and I'm interested in building my own multichannel (4 or more) ADC. I've looked online and I found a hackaday post of a high end stereo DAC, but not much about ADCs, let alone multichannel ones. I was hoping there's a single USB chipset with more than 2 analog inputs but I wasn't able to find one. All chipsets with builtin ADCs feature 2 inputs at most. I looked up some internal photos of professional equipment and all of them use separate ADC chips and USB chips. After some googling I came to the conclusion that the only viable chips for multichannel ADCs are those from Cirrus Logic (considering CS5368), which are priced around 18$ per chip for an 8 channel one. Then I still need to find a USB interface chip. The ADCs are also controlled (or programmed, I don't know) through I2C or SPI which makes life more difficult. I have no idea how to approach this. Does anyone have any experience or advice with this kind of thing?
3
« on: October 25, 2020, 11:25:26 PM »
It also fried both MOSFET drivers (somehow through the GDT) and charred one of the gate resistors. I guess I'll add a few turns to the primary to increase reactance. I'll also add those gate resistor bypass diodes.
4
« on: October 13, 2020, 11:56:39 PM »
So I was browsing loneoceans.com and noticed that some schematics for SSTC bridges had diodes across the gate resistor to make the gate discharge faster. I've built a variant of the KaizerSSTC3 and I was wondering if I could add these diodes, (1N5819) to decrease switching times. I'm worried that while this would decrease switching-off time it will increase switching-on time because of the load it puts on the gate driver. This would in turn cause a decrease in efficiency in the MOSFETs and increase heat production. Is this correct? Can someone shed some light on my theory and perhaps give me a recommendation?
5
« on: September 27, 2020, 11:43:14 PM »
I wrote a polyphonic interrupter for the Bluepill. It uses the STM32duino core for programming. Here's the code: #include <MIDI.h>
MIDI_CREATE_DEFAULT_INSTANCE();
#define sampling_rate 96000 #define max_playing_notes 8
float note_numerator = sampling_rate/440.0; int notePeriod(float pitch){ return note_numerator/pow(2, (pitch-69)/12.0); }
typedef struct { byte pitch; int on_time; int off_time; int been_on; } Note;
Note playing_notes[max_playing_notes];
void handleNoteOn(byte channel, byte pitch, byte velocity){ for(int i = 0; i < max_playing_notes; i++){ if(playing_notes[i].on_time == 0){ int period = notePeriod(pitch); playing_notes[i] = {pitch, 10, period-10, 0}; break; } } digitalWrite(LED_BUILTIN, LOW); }
void handleNoteOff(byte channel, byte pitch, byte velocity){ for(int i = 0; i < max_playing_notes; i++){ if(playing_notes[i].pitch == pitch) playing_notes[i].on_time = 0; } digitalWrite(LED_BUILTIN, HIGH); }
void sample(void){ for(int i = 0; i < max_playing_notes; i++){ if(playing_notes[i].on_time != 0) playing_notes[i].been_on++; } }
void setup() { pinMode(PB9, OUTPUT); digitalWrite(PB9, LOW); pinMode(LED_BUILTIN, OUTPUT); digitalWrite(LED_BUILTIN, HIGH);
for(int i = 0; i<(sizeof(playing_notes)/sizeof(playing_notes[0])); i++){ playing_notes[i] = {0,0,0,0}; }
MIDI.setHandleNoteOn(handleNoteOn); MIDI.setHandleNoteOff(handleNoteOff); MIDI.begin(MIDI_CHANNEL_OMNI);
HardwareTimer *MyTim = new HardwareTimer(TIM2); MyTim->setOverflow(sampling_rate, HERTZ_FORMAT); MyTim->attachInterrupt(sample); MyTim->resume(); }
void loop() { MIDI.read(); bool play = false; for(int i = 0; i < max_playing_notes; i++){ if(playing_notes[i].on_time == 0) continue; if(playing_notes[i].been_on > playing_notes[i].on_time) playing_notes[i].been_on = -playing_notes[i].off_time; if(playing_notes[i].been_on >= 0) play = true; } if(play){ digitalWrite(PB9, HIGH); }else{ digitalWrite(PB9, LOW); } }
License: GPL-3
6
« on: September 16, 2020, 10:36:08 PM »
Has anyone ever built a solid state coil with gallium nitride transistors? I would assume that using more efficient transistors would reduce the need for cooling and risk of damaging them. I've looked at a company that makes them called Transphorm and their FETs are only about 3x as expensive as regular silicon FETs for the same current rating (compared to IRFP460), at a slightly higher voltage. What's interesting is that they can cram a lot of current capability into small packages because of the high efficiency. Let me know what you think.
7
« on: September 07, 2020, 11:34:37 AM »
I've built the kaizer SSTC III and I've tested it at 85V. I've chosen a larger secondary and top load, meaning the resonant frequency is quite a bit lower. This leads me to speculate that I might need larger caps in the capacitive divider or risk discharging them before a full resonant period completes.
So how do I calculate the required capacitance? I know that resonant frequency, primary current and perhaps bus voltage are relevant parameters in the equation.
8
« on: September 01, 2020, 10:12:28 PM »
Tested the bridge at 30V It produces a small amount of breakout but it's a comfortable sound level.
9
« on: August 21, 2020, 11:22:24 PM »
What the title says. More specifically, computer PSUs. Is it OK if I just test their capacitance or something?
10
« on: June 15, 2020, 12:53:04 AM »
11
« on: June 11, 2020, 11:29:42 PM »
Should the driver circuit GND be connected to earth?
12
« on: March 27, 2020, 11:58:01 PM »
For some reason I can't compile this code for Arduino.
#include <MIDI.h>
#define samplingRate 62500 #define maxPlayingNotes 2
MIDI_CREATE_DEFAULT_INSTANCE();
float midiFrequency(float note){ return 440*(pow(2, (note-69)/12)); }
typedef struct { byte pitch; int onTime; int offTime; int hasBeenOn; } Note;
Note getNoteTimes(byte pitch, float dutyCycle){ float period = samplingRate/midiFrequency(pitch); Note finalNote = {pitch, round(dutyCycle*period), round((1-dutyCycle)*period), 0}; return finalNote; }
volatile Note playingNotes[maxPlayingNotes];
void handleNoteOn(byte channel, byte pitch, byte velocity){ for(int i = 0; i < maxPlayingNotes; i++){ if(playingNotes[i].onTime == 0){ // 0 onTime means this note isn't in use playingNotes[i] = getNoteTimes(pitch, 0.1); break; } } digitalWrite(13, HIGH); }
void handleNoteOff(byte channel, byte pitch, byte velocity){ for(int i = 0; i < maxPlayingNotes; i++){ if(playingNotes[i].pitch == pitch){ playingNotes[i] = {0,0,0,0}; // 0 onTime means it doesn't play } } digitalWrite(13, LOW); }
//void handlePitchBend(byte channel, int bend){ // float bendfactor = (1+ (float) bend/8190); // float dutyCycle = 0.1; // for(int i = 0; i < maxPlayingNotes; i++){ // if(playingNotes[i].onTime == 0) continue; // float period = samplingRate/(bendfactor * midiNotes[playingNotes[i].pitch]); // playingNotes[i].onTime = round(dutyCycle*period); // playingNotes[i].offTime = round((1-dutyCycle)*period); // } //}
void setup(){ for(int i = 0; i<(sizeof(playingNotes)/sizeof(playingNotes[0])); i++){ playingNotes[i] = {0,0,0,0}; } // playingNotes[0] = getNoteTimes(261.6, 0.1); // playingNotes[1] = getNoteTimes(329.6, 0.1); // playingNotes[2] = getNoteTimes(392.0, 0.1); pinMode(9, OUTPUT); pinMode(13, OUTPUT);
cli(); //stop interrupts // TCCR2A = 0; // set Timer/Counter Control Registers (TCCR2A/B) to 0 TCCR2B = 0; OCR2A = 0; // = 16000000 / (freq*prescaler) - 1 (must be <256) // turn on CTC mode TCCR2A |= (1 << WGM21); // Set CS01 and CS00 bits for 64 prescaler TCCR2B |= (1 << CS20); // enable timer compare interrupt TIMSK2 |= (1 << OCIE2A); sei(); //allow interrupts
MIDI.setHandleNoteOn(handleNoteOn); MIDI.setHandleNoteOff(handleNoteOff); // MIDI.setHandlePitchBend(handlePitchBend); MIDI.begin(MIDI_CHANNEL_OMNI); }
void loop(){ MIDI.read(); }
volatile bool shouldPlay; ISR(TIMER2_COMPA_vect){
shouldPlay = false; for(int i = 0; i < maxPlayingNotes; i++){ if(playingNotes[i].onTime == 0) continue; playingNotes[i].hasBeenOn++; if(playingNotes[i].hasBeenOn > playingNotes[i].onTime){ playingNotes[i].hasBeenOn = -playingNotes[i].offTime; } if(playingNotes[i].hasBeenOn >= 0){ shouldPlay = true; } }
if(shouldPlay){ PORTB |= 1 << 1; }else{ PORTB &= ~(1 << 1); }
// byte ^= 1 << bit_to_flip; // byte &= ~(1 << bit_to_clear); // byte |= 1 << bit_to_set; }
polyphonic_midi_interrupter_pitchbend:19:1: error: 'Note' does not name a type; did you mean 'tone'? Note getNoteTimes(byte pitch, float dutyCycle){ ^~~~ tone exit status 1 'Note' does not name a type; did you mean 'tone'?
13
« on: March 25, 2020, 10:55:21 PM »
Give me a list of things that could've gone wrong?
14
« on: March 24, 2020, 05:06:18 PM »
#include <MIDI.h>
#define samplingRate 62500 #define maxPlayingNotes 2
MIDI_CREATE_DEFAULT_INSTANCE();
float midiNotes[] = {8.18, 8.66, 9.18, 9.72, 10.3, 10.91, 11.56, 12.25, 12.98, 13.75, 14.57, 15.43, 16.35, 17.32, 18.35, 19.45, 20.6, 21.83, 23.12, 24.5, 25.96, 27.5, 29.14, 30.87, 32.7, 34.65, 36.71, 38.89, 41.2, 43.65, 46.25, 49, 51.91, 55, 58.27, 61.74, 65.41, 69.3, 73.42, 77.78, 82.41, 87.31, 92.5, 98, 103.83, 110, 116.54, 123.47, 130.81, 138.59, 146.83, 155.56, 164.81, 174.61, 185, 196, 207.65, 220, 233.08, 246.94, 261.63, 277.18, 293.66, 311.13, 329.63, 349.23, 369.99, 392, 415.3, 440, 466.16, 493.88, 523.25, 554.37, 587.33, 622.25, 659.26, 698.46, 739.99, 783.99, 830.61, 880, 932.33, 987.77, 1046.5, 1108.73, 1174.66, 1244.51, 1318.51, 1396.91, 1479.98, 1567.98, 1661.22, 1760, 1864.66, 1975.53, 2093, 2217.46, 2349.32, 2489.02, 2637.02, 2793.83, 2959.96, 3135.96, 3322.44, 3520, 3729.31, 3951.07, 4186.01, 4434.92, 4698.64, 4978.03, 5274.04, 5587.65, 5919.91, 6271.93, 6644.88, 7040, 7458.62, 7902.13, 8372.02, 8869.84, 9397.27, 9956.06, 10548.08, 11175.3, 11839.82, 12543.85};
typedef struct { byte pitch; int onTime; int offTime; int hasBeenOn; } Note;
Note getNoteTimes(byte pitch, float dutyCycle){ float period = samplingRate/midiNotes[pitch]; Note finalNote = {pitch, round(dutyCycle*period), round((1-dutyCycle)*period), 0}; return finalNote; }
volatile Note playingNotes[maxPlayingNotes];
void handleNoteOn(byte channel, byte pitch, byte velocity){ for(int i = 0; i < maxPlayingNotes; i++){ if(playingNotes[i].onTime == 0){ // 0 onTime means this note isn't in use playingNotes[i] = getNoteTimes(pitch, 0.1); break; } } digitalWrite(13, HIGH); }
void handleNoteOff(byte channel, byte pitch, byte velocity){ for(int i = 0; i < maxPlayingNotes; i++){ if(playingNotes[i].pitch == pitch){ playingNotes[i] = {0,0,0,0}; // 0 onTime means it doesn't play } } digitalWrite(13, LOW); }
void handlePitchBend(byte channel, int bend){ float bendfactor = (1+ (float) bend/8190); float dutyCycle = 0.1; for(int i = 0; i < maxPlayingNotes; i++){ if(playingNotes[i].onTime == 0) continue; float period = samplingRate/(bendfactor * midiNotes[playingNotes[i].pitch]); playingNotes[i].onTime = round(dutyCycle*period); playingNotes[i].offTime = round((1-dutyCycle)*period); } }
void setup(){ for(int i = 0; i<(sizeof(playingNotes)/sizeof(playingNotes[0])); i++){ playingNotes[i] = {0,0,0,0}; }
pinMode(9, OUTPUT); pinMode(13, OUTPUT);
cli(); //stop interrupts // set Timer/Counter Control Register to 0 TCCR2B = 0; OCR2A = 0; // = 16000000 / (freq*prescaler) - 1 (must be <256) // turn on CTC mode TCCR2A |= (1 << WGM21); // Set CS01 and CS00 bits for 64 prescaler TCCR2B |= (1 << CS20); // enable timer compare interrupt TIMSK2 |= (1 << OCIE2A); sei(); //allow interrupts
MIDI.setHandleNoteOn(handleNoteOn); MIDI.setHandleNoteOff(handleNoteOff); MIDI.setHandlePitchBend(handlePitchBend); MIDI.begin(MIDI_CHANNEL_OMNI); }
void loop(){ MIDI.read(); }
volatile bool shouldPlay; ISR(TIMER2_COMPA_vect){
shouldPlay = false; for(int i = 0; i < maxPlayingNotes; i++){ if(playingNotes[i].onTime == 0) continue; playingNotes[i].hasBeenOn++; if(playingNotes[i].hasBeenOn > playingNotes[i].onTime){ playingNotes[i].hasBeenOn = -playingNotes[i].offTime; } if(playingNotes[i].hasBeenOn >= 0){ shouldPlay = true; } }
if(shouldPlay){ PORTB |= 1 << 1; }else{ PORTB &= ~(1 << 1); }
}
Currently it can only play 2 notes at the same time or else it gets stuck unable to receiver MIDI commands to turn off. I'm nut sure why but I'm guessing because the lack of CPU time to process Serial data because of interrupts.
15
« on: March 21, 2020, 11:23:59 PM »
I'm figuring out how to use toslink to connect my interrupter to my SSTC and the transmitting end works fine but I'm having trouble with the receiving end.
Sometimes the receiver is normally-high and other times it's normally-low. I have no idea if there's any sort of consistency or if I'm doing something wrong. I found a toslink product guide online that says the receiver contains an inverter but that doesn't help at all. Anyone have any experience with toslink?
16
« on: March 19, 2020, 11:53:54 PM »
Is anyone interested in creating a discord server for the forum?
17
« on: March 18, 2020, 10:31:49 PM »
Cringe at the mistakes I'm oblivious to.
18
« on: March 18, 2020, 04:02:40 PM »
I assume the color has some sort of meaning. Videos on youtube suggest to avoid the light green ones. One person also said to avoid ones from computer power supplies, but that's the only source I can find for them really. So which one from the pic should I pick?
19
« on: March 17, 2020, 07:25:45 PM »
So I bought some PU varnish and did the first coat early this afternoon using a rotating LEGO contraption.
Since you're reading this post I just messed up doing the second coat. I should probably have waited longer for the first coat to dry. I also found out that the varnish is meant to be sprayed on...
RIP surface finish.
Tomorrow I'll see how it looks and hopefully a third coat will cover the roughness a bit.
20
« on: March 14, 2020, 04:44:45 PM »
Is it a stupid idea to fill the inside of the secondary with polyurethane spray foam to prevent arcing?
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Mosfet Buffer Stage Questions
[Beginners]
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Egg April 12, 2024, 12:49:02 AM
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Re: UD 2.7 OCD LED stays on, no output during inital test
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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davekni April 12, 2024, 12:41:16 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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davekni April 12, 2024, 12:22:41 AM
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Re: Capacitor Blowout
[Sell / Buy / Trade]
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Michelle_ April 11, 2024, 10:45:53 PM
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Re: UD 2.7 OCD LED stays on, no output during inital test
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Admiral Aaron Ravensdale April 11, 2024, 07:39:30 PM
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Re: UD 2.7 OCD LED stays on, no output during inital test
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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flyingperson23 April 11, 2024, 07:24:52 PM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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sky-guided April 11, 2024, 06:09:30 PM
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UD 2.7 OCD LED stays on, no output during inital test
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Admiral Aaron Ravensdale April 11, 2024, 12:55:16 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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alan sailer April 11, 2024, 03:40:00 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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sky-guided April 11, 2024, 03:05:07 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 11, 2024, 02:57:33 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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alan sailer April 11, 2024, 01:44:32 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 11, 2024, 01:31:40 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 11, 2024, 01:11:00 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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alan sailer April 11, 2024, 12:58:52 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 11, 2024, 12:31:37 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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alan sailer April 11, 2024, 12:30:21 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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alan sailer April 10, 2024, 11:41:46 PM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Mads Barnkob April 10, 2024, 11:33:32 PM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 10, 2024, 10:41:33 PM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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MRMILSTAR April 10, 2024, 10:31:31 PM
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Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 10, 2024, 09:56:35 PM
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Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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unrealcrafter2 April 10, 2024, 08:59:26 PM
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Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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markus April 10, 2024, 06:35:30 PM
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Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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flyingperson23 April 10, 2024, 05:35:14 PM
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Medium Drsstc question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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unrealcrafter2 April 10, 2024, 03:07:02 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
Michelle_ April 10, 2024, 03:42:12 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
Michelle_ April 10, 2024, 03:41:04 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
sky-guided April 10, 2024, 02:50:23 AM
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Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
Unrealeous April 10, 2024, 01:32:17 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
OmGigaTron April 10, 2024, 01:26:29 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
OmGigaTron April 10, 2024, 01:18:35 AM
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Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Mads Barnkob April 09, 2024, 07:34:19 PM
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Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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flyingperson23 April 09, 2024, 06:14:27 PM
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Re: CM400 Induction Heater
[Electronic Circuits]
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markus April 09, 2024, 06:08:53 PM
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Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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markus April 09, 2024, 05:15:19 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
Michelle_ April 09, 2024, 05:11:04 PM
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Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
Benjamin Lockhart April 09, 2024, 06:32:16 AM
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DRSSTC V1 using BSM150
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Unrealeous April 09, 2024, 04:04:47 AM
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