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Messages - ritaismyconscience

Pages: [1] 2 3 ... 8
1
Voltage Multipliers / Re: E-Bay Marx generator
« on: June 30, 2020, 09:14:06 PM »
http://www.newtonscientificinc.com/high-voltage-power-supplies/

It's likely a CW multiplier (voltage is apparently constant instead of being pulses)

2
Please explain in simple English what you are trying to do.

You are trying to heat up a piece of ceramic then use it to vape right?

3
Electronic Circuits / Re: induction heater troubleshooting help
« on: June 30, 2020, 09:01:55 PM »
Try checking for shorts
It's really easy for a solder bridge to form between two parts with bare copper boards

4
You seem to be using a wirewound resistor.
Ceramic resistors use a thin nichrome wire wrapped around a ceramic cylinder. This adds a significant amount of resistance to the resistor. Try using other types of resistors and that should help fix your problem.

5
That GDT doesn't seem to have insulation between the two wires, just lacquer. I've seen people make GDTs with magnet wire but I probably wouldn't risk the wires shorting and blowing up the IGBTs

6
Electronic Circuits / Datasheet Question
« on: June 03, 2020, 08:10:27 AM »
Many datasheets have Ilm (Clamped Inductive Load Current). This number is higher than Icm, which should be the maximum current you can put through the transistor right?

For example, this transistor has an Ilm of 480A but Icm of 360A. Would it be safe to put 480A through the transistor?
https://www.infineon.com/dgdl/irgps4067dpbf.pdf?fileId=5546d462533600a401535656fe252499


Here's what I found on the internet: https://www.infineon.com/dgdl/Infineon-IGBT_Characteristics-AN-v01_00-EN.pdf?fileId=5546d462533600a40153559f8d921224

I still don't understand what Ilm means, is it Icm + reverse current flowing through diode when the transistor switches?

7
I searched it up and I found this:
http://www.aosmd.com/res/application_notes/package/AN101_TO220_Guidelines.pdf

On page 4, there is a graph showing thermal resistance vs torque on screw, and it seems like 0.5Nm is sufficient. Also, overtightening the screw seems to make the thermal resistance worse for some reason.

8
Solid State Tesla Coils (SSTC) / Re: Proper Grounding in an Apartment
« on: June 03, 2020, 12:50:28 AM »
You want the extra resistor so you don't get shocked when unplugging it

9


Here's my plan: I basically cut out 7 wires of the same length to connect to all of the emitters, and I added 7 1n5819 diodes and 7 10 ohm resistors to each gate. I'm going to connect one output of my GDT to these wires.

Will this work? I'm worried about the emitters being at different voltage levels because of the high current.

Edit: Can I use a quarter watt 10 ohm resistor?

10
Transformer (Iron Core) / Re: Neon transformer
« on: June 01, 2020, 07:58:20 PM »
It should work, but you might want to consider putting them in series for 10000V 50mA instead.

11
I made sure there was >2mm insulation around the diodes, so the weak point is probably the edge of the board.

12
Voltage Multipliers / Re: Russian voltage multiplicator stacking
« on: May 31, 2020, 09:25:26 PM »
Once the capacitor charges fully no more current flows through it

13
Voltage Multipliers / Re: Russian voltage multiplicator stacking
« on: May 31, 2020, 09:12:09 PM »
You can test your circuits using the simulator here: http://falstad.com/circuit/

14
Voltage Multipliers / Re: Russian voltage multiplicator stacking
« on: May 31, 2020, 08:57:42 PM »
Yes, its an issue because you'll short out the power supply. Also, the other caps wont be charged because the AC voltage is shorted by the diode

On the negative cycle, the AC input is at lower voltage than ground. This means the diode would conduct and cause large current to flow through it

15
Voltage Multipliers / Re: Russian voltage multiplicator stacking
« on: May 31, 2020, 08:40:02 PM »
Here's what happens if you conenct them:

16
Voltage Multipliers / Re: Russian voltage multiplicator stacking
« on: May 31, 2020, 08:20:07 PM »
if they connect capacitor between V and GND, it's basically a single diode rectifier that charges the capacitor every negative half wave.

if you short V and GND, it'll look like this:

17
Line voltage is 110V (my previous DRSSTC had a doubler too)

18
Voltage Multipliers / Re: Russian voltage multiplicator stacking
« on: May 31, 2020, 07:05:04 PM »
No, if you look at the diagram on the EEVblog video you can see there's no diode between the AC terminals. If you short V and gnd, that's basically conencting a diode between the 2 AC terminals

19
Voltage Multipliers / Re: Russian voltage multiplicator stacking
« on: May 31, 2020, 07:09:09 AM »
I think it could power the focus, which takes a couple kV.

20
Would coating it in nail polish help? I read somewhere that coating the PCB can increase breakdown voltage.

Also I'm going to use a doubler to power it.



I'm using 8x 2700uF 200V

Pages: [1] 2 3 ... 8

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