Re: PIRANHA-III Power control? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 18 Dec 2006 10:27:17 -0700
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: PIRANHA-III Power control? (fwd)




Try running it with a MOT using a small climbing arc on the output of the 
MOT and see what happens.  That's how we are doing our testing at present.

Dr. Resonance



>
> Just a few weeks ago I built a kiln for melting aluminum and various other
> things.. And had a similar problem about how to control the power. My
> solution was to modify an existing 600W lamp dimmer circuit which had a
> triac inside. If you take apart the case its easy to just desolder the
> existing TO-220 case triac and connect something larger.. In my case a
> recycled microwave oven triac, I also replaced the small inductor that was
> on the PCB with something larger and none of the high current travels
> through the PCB anymore. I know the circuit is very simple and you can put
> one together from scratch, but for me it was easier to just take apart the
> lamp dimmer as they are readily available and cheap.. Oh and mine is
> switching an 1800 Watt resistive load at 120Volts..
>
> One question I have is whether these simple trigger DIAC based circuits 
> will
> work with reactive loads?
>
> Here are a few pics
> Just the power controller:
> http://hilo90mhz.hungrychild.org/projects/furnace/DSC07702.jpg
> Power controller and furnace:
> http://hilo90mhz.hungrychild.org/projects/furnace/DSC07705.jpg
>
>
> Chester
>
> On 12/16/06, Tesla list <tesla@xxxxxxxxxx> wrote:
>>
>> Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>
>>
>>
>>
>> ---------- Forwarded message ----------
>> Date: Sat, 16 Dec 2006 19:08:32 -0700
>> From: Terrell Fritz <terrellfone@xxxxxxxxxxxxxxxxxxxxxxx>
>> To: Tesla list <tesla@xxxxxxxxxx>
>> Subject: PIRANHA-III  Power control?
>>
>> Hi,
>>
>> I am working on PIRANHA III issues today.  A dual MOT system that runs 
>> off
>> a 120VAC 20A circuit with ease.  It is in the 8 foot arc to ground
>> range...  About 2kW input at ~90% efficiency.
>>
>> These coils like to run with the MOT input voltage at about 95-105 volts
>> to
>> stay out of the MOT saturation range which just waists precious
>> current.  Normally that is done with a 15 -20 amp variac...
>>
>> http://drsstc.com/~piranha/PIRANHA/PIRANHA-3/PIRANHA-III-001.gif
>>
>> Variacs are very nice, but they are real heavy and not real "modern" or
>> solid state.  The charging circuit (MOT / Primary Cap loop) is resonant
>> too
>> to drive up to a 15000 volt firing voltage...  But the waveforms are
>> pretty
>> "tame" and the power factor is excellent without any fiddling.
>>
>> http://drsstc.com/~piranha/PIRANHA/PIRANHA-3/PIRANHA-III-002.gif
>>
>> It would be super cool to use a beefy lamp dimmer circuit or some similar
>> cheap but very reliable solid state thing to control power other than the
>> variac.  The PIRANHA input section is very forgiving of sloppy input wave
>> forms and all so no big deal there.  Ceiling fans are made for inductive
>> loads...
>>
>> I don't know much about dimmer circuits and such so I can't guess at what
>> to do and feed the computer models well.  0:-|
>>
>> If anyone knows what to do to make a cheap hardy dimmer type circuit that
>> could run two MOTs (~2kW)  I am all ears ;-))
>>
>> Cheers,
>>
>>         Terry
>>
>>
>>
>>
>>
>
>
>