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ArcticMyst Security by Avery

Halo Style 2 stage COILGUN

millirad

millirad

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Well, I worked fast but couldn't quite get to the testing phase until tomorrow. I installed the "trigger" leads for the 2nd stage into the barrel. Then I ohmed the leads using my .25 inch mild steel rod inserted into the barrel and found continuity for both leads. ^^ Then I checked to make sure the contacts were not shorted with the DVM and it looks good. :) Getting close to the 2 stage, first test.

Edit: OT, but would anyone try this circuit to energize their brain. ;-)
http://www.redcircuits.com/Page19.htm
 
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Leodahsan

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good, millirad!! I'm planning to get the charger for my CG this week.
:drool:
 
AnselmoFanZero

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Leo: Will you make one yourself? "Get one" sounds more like buying....
If you want serious power, you could buy a car-inverter. 12VDC -> 230VAC...a few diodes...250W and more.
 
AnselmoFanZero

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You will get 230VAC.......you can use a transformer...you could use a fitting one and wire it output-in.

Wont get easier than that man. Try learn some stuff about transformers...
 
Leodahsan

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Oh yeah, right! I forgot about the transformer.
Anyways, a 60W car inverter costs about $60 here, and a full ZVS would cost around $3 (except mosfets and PCB, that I already have). Dunno what to do :thinking:
 
AnselmoFanZero

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Depends on you.
Always easier to buy. Some ZVS wont work right away...some parts might be not right or damaged...to weak...whatever...so....your decision.

EDIT: My advice? Start simpler....lower wattage...400W is too dangerous anyway. You cant fire one shot per sec, no matter what, so why so much output?
100W would be just right...trust me.
 
AnselmoFanZero

AnselmoFanZero

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No matter what you do in the end, keep it simple.
You will have same power in the end, so why increase effort when it comes to charging?
 
Leodahsan

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Because some day I could change the caps for bigger ones and have more power :eg: but with the same charger.


S
O
M
E
D
A
Y
!
 
AnselmoFanZero

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BS²!
You would have to make new coils and might have to increase the size of the projectile as well. So....dont worry about what COULD be SOMEDAY!
 
millirad

millirad

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Well, I wanted to test the 2 stage to see if it even worked at all. I haven't made a video though because it needed to work repeatedly first. So I fired the shot into a cushion and it apparently had much more energy than just a single stage from the incredibly strong impact and bounce. Unfortunately there was a beautiful spark that came out of the barrel with the projectile. So when I charged the second time and fired again, the 2nd stage didn't discharge. This of course is because my wire leads inside the barrel burned off. ^^ So I'm looking for some ideas on how I can have the leads survive the discharge. ;-)
 
AnselmoFanZero

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Well.....I HOPE I know what happend:

Please tell me you didnt push the pulse throught the projectile!? Did you use the projectile as a switch between coil and cap??

You have to connect the gate of the 2. SCR to the first contact, and the other to the charged cap-bank (stage 2) using an 270R resistor!
 
millirad

millirad

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Yes, you are correct! I used the projectile as a switch between the coil and cap. I was in a hurry to get results. Apparently the only damage is the destroyed wire contacts inside the barrel. I'll get a couple of SCR's tomorrow and try again. It was incredibly powerful, but of course a very risky way to achieve a 2nd stage, now that I know what to do. :)

Edit: Besides a reduced capacitance in the second stage to get a shorter pulse, I wound a shorter 5/8" coil with only 4 layers so I also reduced inductance to shorten the pulse. That was a powerful short pulse and should work well with the SCR.
 
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AnselmoFanZero

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xD oh my god....I hate when things just explode. Could tear apart your barrel as well.
Speaking of barrels...what material do you use? Metal wouldnt work...with metal contacts reaching into ;-) know what I mean?

Get some SCRs...usually they can take alot of current. I like using more than I need to be on the save side.
 
millirad

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I used an epoxy barrel ~6mm ID and ~8mm OD. I wish I created a video of the firing of this incorrectly implemented design. I think it was an even more powerful projectile because of the burning wire contacts. Possibly expanding gas? ;-)

Edit: do you have a minimum rating for the SCR and some part numbers?
 
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