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is this circuit right for fan control?
Is this circuit right for fan control? It has the dimmer in a different location than has been discussed in PopperyII threads here.

Here's the circuit schematic:

I see someone over at Coffee Geeks expressed a similar concern on this design:

"I am in my second year of studying electrical engineering and some of the stuff people discuss still confuses me. I had a question on the frakenformer which I would like to ask and hopefully rather then hijack your thread it would add to it.

PJK Said:
A good illustration of this transformer / dimmer setup by the "frankenformer" guy himself is here:

I checked out that circuit and would love if someone could help explain it to me. I have never seen a transformer wired like that. It looks like it is wired to somehow give it self feedback. Why is it wired like this instead of how you would normally wire a transformer. I googled and checked my textbooks but have not been able to find any info on this method of wiring a transformer.

I'd appreciate comments as I'm beginning my MODS having sourced all the parts today.

Edited by jsutton on 12/30/2010 6:18 PM
I think you need the secondary reversed as it will have reverse polarity. Also, I don't know the benefit of having the dimmer on the higher voltage side of the transformer. I'd prefer to have it before the transformer, but it probably doesn't electrically matter much.

Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
Danger, Will Robinson -- that circuit is to boost an AC fan even higher than 120 volts by adding the secondary to the primary. The headline says "0 to 145 volts"
I thought I remember someone trying to boost the voltage on a P2 fan, and not having success. They either burned it out, or didn't gain speed, I don't remember which, or where I read this.

Also, the P2 has a DC fan, the circuit you so does not rectify, so I don't think it will work. P2's have a diode bridge before the fan.

There is a P2 schematic at the bottom of this page

I know a P1 or the original 1400 watt popcorn pumper, which has a 115V fan, will work fine with a voltage boost to the fan.

maybe it will work. This guy did it.

Edited by randytsuch on 12/31/2010 1:09 PM
Oh, SHOOT! Is this a PII or a Cafe Rosto?... Randy (and Bill) are right, you'll blow a DC motor up giving her AC voltage.

Are you going to boost voltage to the whole roaster entirely?

Edited by seedlings on 01/01/2011 9:21 AM
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
The circuit Jim is showing is for a Cafe Rosto which, if it's like the Rosto I had a couple of years ago, it does have a 120 volt "universal" AC motor.

The circuit is unlike anything I've ever come across having incoming 120 across both primary and secondary.

It definitely won't work with a P2 with DC 20 volt motor. Instant vaporization when the dimmer is cranked!

It's unfortunate that there are so many variations of circuits for AC and DC fan poppers that folks can easily get stuff crossed up if not extremely careful to triple check their design.

1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
Basically, the secondary is in series with the primary adding 25VAC, and it should work as long as the current limit on the secondary isn't reached.

Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
Trying to boost the heat with such a setup would not work -- the tranny is only rated for 2 amps and the popper will draw maybe 12 amps?
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