Hello gentlemen,
some 20 years ago I made some experiments with a DC-controlled
adjustable inductor like that, we called it a varactor. Three of them
were used in a large stabilized three-phase mains supply powered by
giant vacuum tubes (50 to 100 kW or so). Those varactors were three
legged ir
Wow.. If you look closely it appears he has at least a couple of
different taps on that transformer also!
Dave
On 11/22/2010 10:31 PM, Kirk Wallace wrote:
>> Perhaps you have a bad welding lead connection/bad ground or the voltage
>> output is too low?
>>
>> Thanks,
>>
>> Dave
>>
> I don
> Perhaps you have a bad welding lead connection/bad ground or the voltage
> output is too low?
>
> Thanks,
>
> Dave
I don't know what's wrong, it just not working quite right:
http://www.bunkerofdoom.com/00_misc/welder/index.html
(My hat's off to them, they're making do with what they have a
>>A single turn, or rather 3/4 turn, is fine.
Good to know.. I will swap it out for a single turn.
>>One problem I have had recently is that I can start an arc easily,
but I get a shower of small arcs and no heat. On the third or
>>fourth start, I finally get a coherent hot spark.
Sounds lik
On Mon, 2010-11-22 at 13:07 -0500, Dave wrote:
> Is a single turn pot ok or does it really need to be a ten turn or
> whatever it is?
A single turn, or rather 3/4 turn, is fine. I just put the ten turn knob
on the replacement to keep from losing it. This potentiometer sets the
range that the remo
Is a single turn pot ok or does it really need to be a ten turn or
whatever it is?
Most of the welder I know are very "seat of the pants type" of guys. I
seriously doubt if they ever look at the meters.
Not hot enough turn it up. Too hot.. turn it down. Can't get it hot
enough.. get a dif
On Mon, 2010-11-22 at 10:57 -0500, Dave wrote:
... snip
> I have a Hobart Cyber-TIG also. It works but the current control pot
> on the front needs to be replaced as it is flaky.
I replaced mine with a temporary single turn potentiometer. The original
was intermittent so I took it apart:
http:/
I've seen something similar in Mig welders also.. although they are
suppose to be constant voltage while TIG and stick is suppose to be
constant current.
I have a Hobart Cyber-TIG also. It works but the current control pot
on the front needs to be replaced as it is flaky.
I have the single
On 22 November 2010 11:57, Erik Christiansen wrote:
> > there should be a market for wireless temperature/humidity
>> sensors for managing piles.
>
> I see it now, a colour bar graph, ending with a flashing red "PILE CRITICAL"
> display when it's about to catch fire. :-)
> It's a good thing I'm
On Sun, Nov 21, 2010 at 07:40:25PM -0800, Kirk Wallace wrote:
>
> This is like another idea I have had. I have large compost piles that I
> use to process garden and kitchen waste. The piles can be controlled by
> monitoring temperature and adding green material, water and turning the
> pile. I sh
On Mon, 2010-11-22 at 13:22 +1100, Erik Christiansen wrote:
... snip
> Though I've only heard of them in whispers from prehistory, SX1 looks a
> lot like a magnetic amplifier.
... snip
Gene mentioned magnetic amplifiers. I'll need to check this out. Thanks.
> > One of my problems is that I can't
On Sun, Nov 21, 2010 at 02:14:05PM -0800, Kirk Wallace wrote:
> On Sun, 2010-11-21 at 21:27 +, Leslie Newell wrote:
> > Yes it does sound like a variable reactor setup. The control signal is
> > DC and pushes the core into saturation, reducing it's inductance. The
> > early BOSS Bridgeport C
On Sun, 2010-11-21 at 21:27 +, Leslie Newell wrote:
> Yes it does sound like a variable reactor setup. The control signal is
> DC and pushes the core into saturation, reducing it's inductance. The
> early BOSS Bridgeport CNC mills used this sort of setup to reduce the
> idle current on the
Yes it does sound like a variable reactor setup. The control signal is
DC and pushes the core into saturation, reducing it's inductance. The
early BOSS Bridgeport CNC mills used this sort of setup to reduce the
idle current on the stepper motors. It also used to be quite commonly
used on TIG w
I have what appears to be a transformer with a reactor in series with
the secondary. The reactor is used to control the transformer output
current. I can imagine the reactor will act like a normal inductor and
impede the AC current, but the reactor has another coil on it. I assume
this coil is used
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