The thing about MOTs is they are built to a price and have some quirks, e.g.
one end of the secondary is connected to the core/ground. If cascading MOTs,
generally you would disconnect the wire from the core and daisy-chain the
secondaries but that then means that there is suddenly 2000V (or a
I have done a 2X2 series/parallel and a 4 in series. I used mineral oil.
There are better oils but I could get 5 gallon buckets of mineral oil
from a local feed store.
You also usually need to add some current limiting.
A small Tesla coil won't hurt anything. :-0
Jonathan
On 5/13/2016 3:28
>
> > Plus, series/parallel 'em under oil for a VERY nasty HV power supply.
>
[...]
Curious how many you've cascaded, and what kind of oil you use.
I've been tempted to build a Tesla coil for many years, but we live too
close to an airport so I'm concerned about the RFI impact on comm &
Ya beat me to it. Plus, series/parallel 'em under oil for a VERY nasty
HV power supply. I've run Tesla coils on them and other silly things.
But they are QUITE lethal.
I grab every big older MOT i see. The new ones, meh.
Jonathan
A MOT actually IS currently limited using the same stray flux
On 05/13/2016 01:57 PM, gregebert wrote:
> NEVER use a microwave oven transformer; they are deadly because there is no
> current-limiting, and their voltage is probably too low anyways.
A MOT actually IS currently limited using the same stray flux technology
as neon transformers. If you look
Transformers specifically designed for neon signs are perfect because they
are intentionally current-limited, and the exact voltage isn't critical.
I've lit all sorts of neon tubes with my 5kV sign transformer.
I've had mine for 40+ years and never got shocked (only slight tingle). I
don't
You are right on the level shifters -- I didn't pick up on the VCC in an
earlier post.
However, regarding the schematic -- every designer has his/her own purposes
in drawing a schematic. If I am drawing a schematic for my own use, I will
do it differently than when I am drawing one for my
Shipping is indeed sporadic.
I just received a shipment of tubes from Russia that took 2 ½ weeks from
shipment to arrival at my door. The package had a lot of stamps on it (about
20). I was expecting a much longer wait. These entered through New York
customs direct to Minneapolis.
On Fri, 13 May 2016 09:02:52 +1000, you wrote:
>Sorry if this is the wrong group. I have been offered a large quantity of
>vintage neon tubes from old signs, "burgers", "restaurant" "cafe", that
>sort of thing, together with straight & curved lines. How do I find out the
>value? I can test them.
"It's not even a schematic error."
I disagree:
- you want your schematic to be consistent, in this case it's clearly not as
most parts display their ground/power pins connected, except the MAX232A.
- you want it to be unambiguous: obviously, it's not.
- if you work with multiple voltage levels
On Thursday, May 12, 2016 at 11:11:59 PM UTC-7, jf...@my-deja.com wrote:
>
> They finally arrived after 12 weeks. Based on the tracking information,
> it took about 11 weeks to get to New Jersey, and another week for the USPS
> to get it to California. The package was marked "Air Mail" and
On Wednesday, March 30, 2016 at 12:10:00 PM UTC-7, jf...@my-deja.com wrote:
>
> I am not sure who is to blame, but after almost two months, I am still
> waiting for some 13-pin dekatron sockets being sent from Russia.
>
They finally arrived after 12 weeks. Based on the tracking information,
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