“I built this small coil in about 1 day of work. Its small and relatively safe.” Up to 7 in of spark, limited by the heatsinks. Dropping the primary to four turns cured the MOSFET heating; the toroid came off in favour of a bare wire. The page kept being revised for three years.
Schematics and photos
Mini SSTC · Base 3 
Mini SSTC · Base 4 
Mini SSTC · Base 6 
Mini SSTC · Base 7 
Mini SSTC · Mini SSTCfnlsch 
Mini SSTC · Mini SSTCsch 
Mini SSTC · Mini SSTCsch 3 
Mini SSTC · Spark 1 
Mini SSTC · Spark 10 
Mini SSTC · Spark 11 
Mini SSTC · Spark 12 
Mini SSTC · Spark 13 
Mini SSTC · Spark 14 
Mini SSTC · Spark 2 
Mini SSTC · Spark 3 
Mini SSTC · Spark 4 
Mini SSTC · Spark 5 
Mini SSTC · Spark 6 
Mini SSTC · Spark 7 
Mini SSTC · Spark 8
Sources
This is the card from the driver tree, written from what the builder published. Send corrections through the forum.