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Topic: variable transformers (17 msgs / 423 lines)
1) From: DeCambre.Peter
I will be out of the office starting  11/26/2002 and will not return
until 12/02/2002.
I will respond to your message when I return.
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2) From: peter zulkowski
Hi Folks,
Recently I read on this list that someone was using slide dimmers ?? for
voltage control. I want to manually control a split wired popcorn popper so
I need something that will handle the 1400 watts it uses.
Does anyone have any suggestions as to what I need and where I can get it
cheaply?  Is it possible to use a lamp dimmer and have it control circuitry
that will do the job? Do light dimmers handle this much alone?
If I had a schematic I bet I could build something that would not be as
heavy as a Variac.
Thank you very much for your consideration,
Peter Z
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3) From: Dean
hi Peter,
Before I retired my Rostos I tried using a solid-state router speed 
control (plug-in gadget) that I got from harbor freight
It worked, but it got kinda hot.  watch the specs, won't work with 
induction motors, only universals, YMMV etc.
On 2/24/2012 3:59 PM, peter zulkowski wrote:
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4) From: Michael Mccandless
Hello Peter,
I've seen a few of these but this one caught my eye:
Controller
Simple but looks to be effective.
Mike Mc
On Fri, Feb 24, 2012 at 2:59 PM, peter zulkowski wrote:
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5) From: John Stewart
Most dimmers aren't capable of controlling the power demands for an entire =
popcorn/coffee roaster.  Many dimmers are capable of handling the fan cir=
cuit in popcorn corn popper roaster.  My air popper/roaster has a variac =
on the heating circuit and a dimmer on the fan circuit.  However, I've ru=
n roasts without changing the heat controls at all.  If your fan is power=
ful enough to overrun the heat output of the coils and can be slowed so the=
 heat builds up in the coils faster than the air takes it away - then you c=
an have good temperature in the roast chamber with fan controls only.
Variacs can be expensive and hard to source.  I lucked out and was gifted=
 one by a friend.  It needed a little work, but now it works fine.  Fan=
 controls for a typical popper can be sourced with a trip to home depot and=
 radio shack or similar stores.  You can find many sites that provide gui=
des for the process.  I get a lot of good tips from homeroasters.org
John
 From: Michael Mccandless 
To: "A list to discuss home coffee roasting. There are rules for this list,=
 available athttp://www.sweetmarias.com/maillistinfo.html" =
Sent: Friday, February 24, 2012 8:03 PM
Subject: Re: [Homeroast] variable transformers
 =
Hello Peter,
I've seen a few of these but this one caught my eye:
Controller
Simple but looks to be effective.
Mike Mc
On Fri, Feb 24, 2012 at 2:59 PM, peter zulkowski wrot=
e:
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so
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itry
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mariascoffee.com
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a>
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6) From: peter zulkowski
Hi Mike,
              Thank you for the site and that looks fairly easy to build :)
It is good to be able to over speed fans when roasting I think.
For the heater coil I am going to try this option:http://www.amazon.com/gp/product/B001NIK6PC/ref=oh_o00_s00_i00_detailsIf it will work with a router it should work with a heater, no?
Best,
PeterZ
On Fri, Feb 24, 2012 at 11:03 PM, Michael Mccandless Sweet Maria's Forum
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7) From: Martin Maney
On Sat, Feb 25, 2012 at 03:24:56PM -0500, peter zulkowski wrote:
<Snip>
Yes, although there are other options.  Amazon has recently been
carrying a Leviton lamp dimmer rated at 1500W which several folks have
reported on favorably in the forums.http://www.sweetmariascoffee.com/forum/viewtopic.php?f&t&62-- 
In software as well as in modern art,
the distinction between intentional and accidental omissions
is often difficult to make.  -- Andrew Hunt & David Thomas
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8) From: g paris p
you can also check with most large greenhouse supply companies or grainger
for heavy duty fan/light controllers.
-g
On Sun, Feb 26, 2012 at 8:07 PM, Martin Maney  wrote:
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9) From: Zev Rieser
I am in the middle of research for this as well. Saw this and wondered what
people thought.... definately cheaper than a variac...
 MLCS 9400 Standard Duty Router Speed Controlhttp://www.amazon.com/gp/aw/d/B001JHQ3G8/ref=aw_cr_d_hiThanks
Zev
On Sun, Feb 26, 2012 at 10:07 PM, Martin Maney  wrote:
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10) From: peter zulkowski
Hey Zey :)
The larger one (20A) that I ordered will be here on Wednesday Feb 29. I
will update this thread on how it works with a Poppery. Can hardly wait!
Peter Z
On Mon, Feb 27, 2012 at 10:50 AM, Zev Rieser  wrote:
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11) From: Zev Rieser
Peter,
Please do!! I just upgraded from a Popcorn popper to the  Stir Crazy/Turbo
oven, and would like to set it up so I can have full control over heat for
profiles.... the variac route just is very expensive, so would love to have
an alternate method.
Zev
On Mon, Feb 27, 2012 at 1:38 PM, peter zulkowski wrote:
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12) From: peter zulkowski
While rummaging through the things that I DID bring, I am becoming
very upset with myself here.
When I left AZ I left my 25 amp Variac behind (too heavy) figuring I could
replace it for what I spent to get it.
Forgot I bought it 12 years ago! I guess I paid about $45 + shipping from
ebay at that time.
Now they are untouchable.
Need a business to justify it!
I left too much stuff there that I was planning to replace cheap. Oh well.
So sad that it all went in the dumpster.
Now even the Chinese junk is way beyond my means :(
BUT,
almost forgot this part:
While in AZ I did pick up a red Chinese Variac knock-off at a yard sale...
free.
It did not work, and the guy wanted it hauled away.
It was heavy.
I like free :)
I took it all apart...  figuring I could fix it.....
you do not want to *buy* one of them.
My guess to what had happened to it was: it had fallen because all the
bearings and plastic inside was destroyed.
It didn't look bad on the outside though.
Looked to be in good shape.
Buyer beware. Free is okay if you have time to tinker.
Please do not buy Chinese Variacs.
From my limited experience with then, they are throw away's.
Best,
Peter Z
On Mon, Feb 27, 2012 at 1:53 PM, Zev Rieser  wrote:
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13) From: Ira
At 10:53 AM 2/27/2012, you wrote:
<Snip>
An SSR and some way to control it would also be a reasonable 
solution.  I intend to control mine with RT one of these days.
Ira
www.roasterthing.com
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14) From: g paris p
Peter;
do you still want a variac? I may have a second, like new one, in the
basement.
-
On Mon, Feb 27, 2012 at 2:45 PM, peter zulkowski wrote:
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15) From: raymanowen
KISS- Do Not, rpt, NOT control temperature of a heat process by varying the
power applied to the electric heater. Skipping all the details, just run
the heating device at Full Power- 100%, or whatever you can get with the
available power.
Instead of trying to control temperature by varying the line potential and
heater current, just control the low power drawn by the air mover.(fan
motor)  Low air flow through a heating device or Corvair engine causes the
air stream to get hotter and the engine to cook a couple dozen O-ring oil
seals after the fan belt flips.
SCR, Triac/ diac dimmers are extremely non-linear devices and resistive
heaters respond exponentially to applied potential changes. Kiss
temperature control goodbye.
-- 
Persist in old ways; expect new results - suborn Insanity...
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16) From: Rich
Ray, now you have gone and spoiled all the fun. ;)
On 02/28/2012 07:24 PM, raymanowen wrote:
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17) From: peter zulkowski
Thanks for your support Mike,; Sorry to hear about your mis-placed beans.
They just gotta be somewhere huh? Hopefully they will be found soon.. and
delivered.
PeterZ
On Tue, Feb 28, 2012 at 9:51 PM, miKe mcKoffee  wrote:
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