[sdiy] TB303 / Polysix VCO current mirror thingy.

[rburnett at richieburnett.co.uk]

> ...but when they switched them off with the switch upstairs the hall 
> light would - after a few minutes - begin to flash about every
> 30 seconds.  Blink... Blink... Blink...

Apparently even the capacitance in long cable runs to switches was 
enough to make some early CFL units blink!  I think modern ones 
sacrifice a bit of efficiency with a bleeder resistor to prevent this 
behaviour.