Petn1933
Hazard to Others
Posts: 106
Registered: 16-9-2019
Member Is Offline
|
|
My new blasting machine
This is my electronic blasting machine
Weight:650 g
Max voltage:300v - 13.5j
2AA battery 3v as input voltage source
I use camera flash circuit - aluminum box and...
Of course, there is still a lot of work to be done Like sticking labels and signs.
  
|
|
|
XeonTheMGPony
International Hazard
Posts: 1640
Registered: 5-1-2016
Member Is Offline
Mood: No Mood
|
|
Nice, any more info on the internals?
Wish I could find those circuits still here, going to have to make one at this point
|
|
|
Syn the Sizer
National Hazard
Posts: 600
Registered: 12-11-2019
Location: Canada
Member Is Offline
|
|
I am sure we could still find camera flashes here. Check out a professional photographer store. Or do they still sell disposable cameras?
I will try building one with what I have here, I imagine its a boost converter and if its working off 2 AA's it's not drawing too much current from
the source, you could probably mod it to us good high discharge rechargeable 18650s like the SAMSUNG INR 18650 3000 mAh with a 20 A peak discharge and
get better life out of it.
Edit:
I guess you would still need a cap network to hold the charge.
[Edited on 29-5-2020 by Syn the Sizer]
|
|
|
Petn1933
Hazard to Others
Posts: 106
Registered: 16-9-2019
Member Is Offline
|
|
https://www.ebay.com/i/383561293363?rt=nc&_trkparms=aid%...
|
|
|
Petn1933
Hazard to Others
Posts: 106
Registered: 16-9-2019
Member Is Offline
|
|
I use an old nikon camera.
removed the camera parts. Then I used a higher quality capacitor. And to show that the voltage level was sufficient, I designed and built a separate
circuit (because I changed the capacitor The voltage level didn't work anymore).
|
|
|
underground
National Hazard
Posts: 704
Registered: 10-10-2013
Location: Europe
Member Is Offline
|
|
I started an EBW circuit but i have abandoned it for now. I have already built it and everything was working fine, except for some reason, while the
Caps was charged, there was no wire explosion. I was thinking that maybe my caps were problematic (x2 microwave oven caps in series) or the LM
regulator did not allow much current to flow through the circuit in order to charge the caps properly. I was planning to add another LM Vregulator in
parallel or just completely remove it and test it again but i have not done it yet and i really dont know when i will do it.
The LM circuit regulates the input voltage for the desired output voltage ( around 4kv).
IR2153 Circuit to invert DC to full-wave AC
For voltage divider, i used R1 40Mohm R2 678Kohm for 1/100 since my vmeter got 1Mohn internal resistance. I added a small variable resistor to R2 and
checked the vdivider with a 12v battery in milivolt scale until i got 120milivolt. At this point, i was sure that my vdivider was at 1/100
The voltage multiplier circuit was made with UF 4007 diodes and 2kv 10nf caps
The circuit with the brown square was made with 3 relays and made so when the EBW fires, the whole circuit will stop operating to prevent the caps
from charging after firing.
If you have any other questions feel free to ask
[Edited on 29-5-2020 by underground]
|
|
|
Brightthermite
Hazard to Others
Posts: 133
Registered: 26-6-2019
Member Is Offline
|
|
What kind of button is that? I have built things similar to this and my switches always get welded shut after a few uses.
|
|
|
underground
National Hazard
Posts: 704
Registered: 10-10-2013
Location: Europe
Member Is Offline
|
|
Do you mean the trigatron ? I used 2 brass rods in few mm distance and a TV transformer to send an arc in order to close the circuit.
|
|
|
Petn1933
Hazard to Others
Posts: 106
Registered: 16-9-2019
Member Is Offline
|
|
I used an industrial electric switch.(650v, 25amp)
|
|
|
Brightthermite
Hazard to Others
Posts: 133
Registered: 26-6-2019
Member Is Offline
|
|
Quote: Originally posted by underground  |
Do you mean the trigatron ? I used 2 brass rods in few mm distance and a TV transformer to send an arc in order to close the circuit.
|
I was talking about the button on the original post. Id love to see a schematic of your trigatron tho, I have yet to find a good design for a homemade
one!
@Petn1933 What is the total capacitance of your camera flash circuit? Using that switch to discharge a capacitor should spike well above the rated
amps. It would be great if you could keep us updated on if they switch ever fails.
|
|
|
Petn1933
Hazard to Others
Posts: 106
Registered: 16-9-2019
Member Is Offline
|
|
@Petn1933 What is the total capacitance of your camera flash circuit? Using that switch to discharge a capacitor should spike well above the rated
amps. It would be great if you could keep us updated on if they switch ever fails.[/rquote]
My capacitor: 350 micro, max voltage 400v
When charged near 300v >> u:0.5*c*v*v=15.75j
My electric key (600v -20 amp)
|
|
|
Petn1933
Hazard to Others
Posts: 106
Registered: 16-9-2019
Member Is Offline
|
|
In your opinion, in blasting machine Is voltage more important or current intensity?
|
|
|
Belowzero
Hazard to Others
Posts: 173
Registered: 6-5-2020
Location: Member Is Offline
Member Is Offline
|
|
Bit of a vague question but voltage is required to overcome wire resistance, the longer your wire the higher the voltage you need.
[Edited on 31-5-2020 by Belowzero]
|
|
|
Brightthermite
Hazard to Others
Posts: 133
Registered: 26-6-2019
Member Is Offline
|
|
Since capacitors are being used and the energy is voltage squared, I would say voltage is more important. The great thing about capacitors is they act
as ideal voltage sources for some short time, so within a time constant (R*C) they can provide quite a lot of current. And as already stated the
further away you want to get the more voltage you will need.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
