HomeRoast Digest


Topic: fan control w/heater protection update (32 lines)
1) From: Mike McGinness
Picked up a cheapo $3.95 600w light dimmer to test with the diode jump.
Works fine. First wired without diode, could trim fan speed to nothing and
zero measured volts. With diode wired in and dimmer turned off, fan received
about 78v, enough to turn the fan no problem though I wouldn't want to run
it that slow too long me thinks. Turned on dimmer, at lowest get 90v to fan,
max about the same as without diode. Ran fan at 140v for 2min. to see how
circuitry would handle the load, no problem. Looks like a viable solution if
seeking to have heater enabled only with power to fan enabled. Oh, I was
using a second 25.2v 2A transformer I picked up for $2.95. (Actually picked
up two more, yeah Deward, an Electronics place that carries new and surplus
stuff...) Figured I'll use it when I build the combined unit, the second
extra just because:-)
Project about ready to assemble. Have all the toggle switches for master on,
fan on, heater on, and to toggle digital ac meter between heater and fan.
Plus indicator lights - green for master, amber for fan, red for heater. And
of course fuse holder and 15A fuses (slightly pushing the rating I know).
The 10A Powerstat variac shipped today so once again patience! Was trying to
figure out what to build it in and think I have the solution. I have a
virtually never used old metal tool box it'll all fit nicely in. So it'll
even have a ready made carry handle! I might be able to rig it so a Rosto
will fit inside for travel...
MM;-) aka Kona Konnaisseur miKe mcKoffee
Dual Variable Transformer Rosto Roasting
Rocky grindin' - Miss Silvia brewin'
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