OT: white LEDs (was: Re: Solderless breadboarding (and 68010 vs

[Tony Duell]

> 
> On Fri, Feb 26, 2010 at 2:26 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
> > Ah, TV sets over here rarely had power transformers at all... Every valved
> > monochrome TV Iv'e worked on... had a 300mA series string of valve heaters
> > and got the B+ line by half-wave rectifying the mains.
> 
> Sure, but your mains were twice the voltage of our mains.

I am suprised that voltage doubler PSUs (2 diodes, 2 capacitors) weren't 
used in the States. 

-tony