[Homeroast] variable transformers

peter zulkowski peterz5743 at gmail.com
Thu Mar 1 16:02:12 CST 2012

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


On Tue, Feb 28, 2012 at 9:51 PM, miKe mcKoffee <mckona at comcast.net> wrote:

> Balderdash! Using the proper tool for the job controlling electric heated
> roaster works quite well. However, trying to skimp and use the wrong tool
> for the job indeed can result in meltdown. Variable transformer works quite
> well "combined" with variable air-flow control, especially with boosted
> voltage capability. Used dual variable voltage boosted voltage control
> split
> wired Rosto Roasting for years. Just controlling one or the other is
> extremely limiting in what you can do with your roaster.
> Another method that works well IF you don't need or want additional power
> from boosted voltage is PID (or other method) of pulsing the heater on
> time.
> Or combined with fixed boosted transformer :) Air-flow fan however needs
> linear control rather than pulsed.
> Slave to the Bean miKe mcKoffee
> www.CompassCoffeeRoasting.com
> URL to Rosto mods, FrankenFormer, some recipes etc:
> http://www.mckoffee.com/
> Ultimately the quest for Koffee Nirvana is a solitary path. To know I must
> first not know. And in knowing know I know not. Each Personal enlightenment
> found exploring the many divergent foot steps of Those who have gone
> before.
> Sweet Maria's List - Searchable Archives http://themeyers.org/HomeRoast/
> -----Original Message-----
> From: homeroast-bounces at lists.sweetmariascoffee.com
> [mailto:homeroast-bounces at lists.sweetmariascoffee.com] On Behalf Of
> raymanowen at gmail.com
> Sent: Tuesday, February 28, 2012 5:24 PM
> To: A list to discuss home coffee roasting. There are rules for this
> list,available at http://www.sweetmarias.com/maillistinfo.html
> Subject: Re: [Homeroast] variable transformers
> 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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