Re: Rob's flyback circuit

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jonathan Peakall by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jpeakall-at-madlabs.info>

Rob,

I have found 20v to be a little high for 3055's. I haven't seen the
robflyback schematic, but you can try the simple one or two transistor
circuits on my page, which seem to be quite reliable and 3055's seem to
survive  ;-).

Where did you get your 3055s? I have found Radio Shacks to be very eratic.
Some blow right away, some tough it out. I use 3055HV's that All Electronics
sells, and have yet to blow one. Except being silly ;-). How many primary
turns are you using? With 1-2 turns and 12v input, I get satisfactory
output. Arcs start around 4cm, lights up a big plasma globe (read large
clear light bulb). The flyback does run a little hot however, I never run it
for more than 5 minutes at a time.


----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, June 20, 2002 10:38 AM
Subject: Rob's flyback circuit


> Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<rob-at-pythonemproject-dot-com>
>
> Well, I can't get my own circuit working (the one in the archive
> robflyback.sch).  Blew up 2 2N3055's.  I have yet to remember the secret
> to getting high output from a cheap transistor.  I did get an NTE328 to
> work, but it had spurious HF oscillations, and didn't give really high
> output.  The really suprising thing was seeing 300V on the collector,
> using a 20V DC supply.
>
> As soon as I figure this out I will update the schematic.  Maybe I need
> to get hypnosis to bring me back to my childhood HV days :)
>
> Rob.
>
>
> --
> -----------------------------
> The Numeric Python EM Project
>
> www.pythonemproject-dot-com
>
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>
>