HomeRoast Digest


Topic: homeroast digest, Vol 1 #4417 - 26 msgs (4 msgs / 78 lines)
1) From: David Lang
Instead of a small variac, I'm using a light dimmer and small 
transformer wired up as a voltage booster for fan control of a P1.  Cheaper.
Described here on Mike Mckoffee's site http://mdmint.home.comcast.net/coffee/fancontrolproto.htmThe same 25 volt transformer and dimmer switch can be used to control 
the low voltage fan of a poppery 2  or similar popper.  That's what I 
bought it for until the motor burnt out eventually and I switched to a 
P1.  Using a transformer rather than the secondary heating element to 
drop the voltage for the motor has the advantage that the fan can be 
used for initial cooling
I used only the main element for heat and the dimmer/transformer for fan 
control.  Didn't connect the smaller heating coil at all.  That combo 
slowed down the roast nicely.  For crude temperature control I just 
switched off the heat for a few seconds several times during the roast.
Dave
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2) From: Ed Needham
Some have found that the dimmer steals too much energy for the fan or 
heater, even at it's full on setting.  Is that your experience?
*********************
Ed Needham®
"to absurdity and beyond!"
ed at homeroaster dot com
(include [FRIEND] in subject line to get through my SPAM filters)
*********************

3) From: Michael Wascher
The 25V transformer is wired as an autotransformer, it boost the voltage to
about 145 volts (assuming 120 volts from the outlet). Then you can afford
some losses from the dimmer. The site shows a measured maximum voltage
138.3V, measureed under actual operation.
--MikeW
On 5/6/06, Ed Needham  wrote:
<Snip>
--
"Life is just one damned thing after another."
  - Elbert Hubbard

4) From: Bill Morgan
I have seen that the dimmer "full on" still doesn't give full voltage.
 I'm planning to add a switch to bypass the dimmer when I want all the
fan I can get.  (This is because I have only full voltage or -5 V on
the heater, so most of my control is the fan.  Some day my variac will
appear...)
Bill
On 5/6/06, Ed Needham  wrote:
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