Discharge a huge voltage
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From: George Herold on 4 Mar 2010 20:22 On Mar 3, 8:16 pm, lerameur <leram...(a)yahoo.com> wrote: > hello, > > I have a very simple circuit here, I am charging a 900uF capacitor to > 600v. (900v max capacity) > I want to discharge this at 0.01seconds interval. I have 30 ohm > resistance, without so from my calculation I should have 20 amp max. > All this element are in series with each other, I want to add a > transistor (or mosfet) to make and break the intervals I need. > DO I need to get a 600v and a 20 amp rated transistor ? > > Thanks about 1mF and 30 ohms gives me a 30ms TC, so 0.01s isn't going to work... But since I'm the 21st reply I assume that's been said. George H.
From: Sjouke Burry on 4 Mar 2010 21:36 lerameur wrote: > On Mar 4, 6:25 pm, sparky <sparky...(a)yahoo.com> wrote: >> On Mar 4, 3:20 pm, lerameur <leram...(a)yahoo.com> wrote: >> >> >> >>> On 4 mar, 14:27, Ecnerwal >>> <MyNameForw...(a)ReplaceWithMyVices.Com.invalid> wrote: >>>> In article <K-OdneKLsMMhmQ3WnZ2dnUVZ_tCdn...(a)web-ster.com>, >>>> Tim Wescott <t...(a)seemywebsite.now> wrote: >>>>> Turn-off becomes an issue. I know that there are ways to turn off an >>>>> SCR on a DC supply, but it's some wacky thing involving an auxiliary >>>>> inductor that snaps the current off briefly so the SCR can turn off -- >>>>> it all looks pretty smoky to me. >>>> It's definitely getting into the realm of tubes (mostly thyratrons) >>>> ruling, though at high amperage the tubes are available, but do tend to >>>> cost a few thousand dollars. At the lower amperage ranges, if you stick >>>> to those tubes that are still commonly available they can cost a lot >>>> less than silicon to do the same job. >>>> On the third hand, the application becomes highly suspect as I can think >>>> of a number of nefarious uses this might be aiming towards I wouldn't >>>> care to help with. Not quite as blatant as the person a few months ago >>>> that was evidently looking for help in designing a roadside bomb, but a >>>> spark gap creates an infernal amount of RF noise... >>>> -- >>>> Cats, coffee, chocolate...vices to live by >>> I am looking to make a unidirectional spark. I also thought of using >>> like the old days a rotary spark gap, but with a 3600 rpm motor, even >>> with 10 contacts around I get 3600rpm/60 =600rps with 10 contacts = >>> 6000hz. I guess 6000hz is good enough. >>> Also with a higher voltage, could I increase the resistance.? >>> JP- Hide quoted text - >>> - Show quoted text - >> You could go higher. >> >> 600 volts is certainly not a HUGE voltage. > > Ok here is the circuit I am trying to replicate. Some of you will say > it is not possible, it is not concrete, but hey I am just trying it > out. > Like I said , I just want to make a simple circuit with a capacitor > discharging through a spark gap for now, nothing else. > http://www.energeticforum.com/renewable-energy/3235-gray-tube-replication-2.html&usg=__iSdcL6jpOkRkqf7S8vhO8UyJzew=&h=711&w=831&sz=132&hl=en&start=6&sig2=-iiXL_uogSvS1uj0DcYeXw&um=1&itbs=1&tbnid=ZeLwLSgYlT4p6M:&tbnh=123&tbnw=144&prev=/images%3Fq%3Dgrey%2Btube%2Bbedini%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26sa%3DN%26rls%3Dorg.mozilla:en-US:official%26tbs%3Disch:1&ei=bDGQS7j0N8_I_gbih4nVDA > > Also, in the schematic shown, there is a diode that seems to be on > backwards, but some dud on the web site says it is not.. I still think > it is on backward, can somebody has an explanation for that. The > circuit is doable, the effect well not so much I think > thanks > JP. You should try to get a hydrogen thyratron tube, I used one in 1967 to discharge 20KV through a 75 ohm resistor, that was 266 amperes, or a peak power of 266*226*75=5.3 mega watt..... Used to make cosmic rays visible. Lots of fun(and problems, and fireworks).
From: whit3rd on 5 Mar 2010 17:22 On Mar 4, 7:37 pm, Sjouke Burry <burrynulnulf...(a)ppllaanneett.nnll> wrote: > lerameur wrote: > >>>>>> It's definitely getting into the realm of tubes (mostly thyratrons) > > and where do you get a hydrogen thyratron tube? > Form the university storage :) I dont even know the type anymore, > but it was big,(15 cm high) and the ingnition voltage was 500 volt. The easiest thyratron to find would be a photographic strobe light (usually xenon filled); they are intended for a millisecond or two of high current with long recovery time, though.
From: John Fields on 5 Mar 2010 18:07
On Thu, 4 Mar 2010 18:45:22 -0800 (PST), lerameur <lerameur(a)yahoo.com> wrote: >Only that if I reduce the carbon cube or eliminate I will basically >get almost next to zero resistance, but I do want to add a little bit >of a resistance in the circuit, how much ?? I do not know yet. >and where do you get a hydrogen thyratron tube? --- http://www.rell.com/Pages/Product-End-Category.aspx?productCategory=10268 JF |