Welcome to the coil-winding club, David!
The controller schematic you provided is the absolute basic triac-based phase angle power controller - it should work with most sewing machine motors - the circuit is electrically noisy as it's not a "zero-crossing" controller, i.e. it switches current mid-phase creating EMI.
I would use a micrometer to measure the diameter of the wire, then work out how much you need of that diameter for 2Kohms, and the weight of that.
A useful table can be found at http://www.engineeringtoolbox.com/wire-g...d_419.html. If you look at the diameter on the Brocott's site (http://www.brocott.co.uk, that'll give you numbers you need to calculate the weight for a given gauge and length.
Measuring the length that you are winding is nigh on impossible, so do it by weight - if you have a set of digital kitchen scales, these are accurate to 1/10 gramme, so stick the spool on the scales and watch the weight drop...
One thing I've found when doing the DAC90A output xfrmr etc is that the feed spool must be extremely free-running, preferable on good bearings as any "jerk" at all will snap the wire. I have known people to use the bearings from the read/write head of an old VCR for this - works very well...
The controller schematic you provided is the absolute basic triac-based phase angle power controller - it should work with most sewing machine motors - the circuit is electrically noisy as it's not a "zero-crossing" controller, i.e. it switches current mid-phase creating EMI.
I would use a micrometer to measure the diameter of the wire, then work out how much you need of that diameter for 2Kohms, and the weight of that.
A useful table can be found at http://www.engineeringtoolbox.com/wire-g...d_419.html. If you look at the diameter on the Brocott's site (http://www.brocott.co.uk, that'll give you numbers you need to calculate the weight for a given gauge and length.
Measuring the length that you are winding is nigh on impossible, so do it by weight - if you have a set of digital kitchen scales, these are accurate to 1/10 gramme, so stick the spool on the scales and watch the weight drop...
One thing I've found when doing the DAC90A output xfrmr etc is that the feed spool must be extremely free-running, preferable on good bearings as any "jerk" at all will snap the wire. I have known people to use the bearings from the read/write head of an old VCR for this - works very well...
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