[Re: Power source]

[Paul Perry]

At 09:52 PM 11/03/99 EST, Harry Bissell  wrote:
> The
>half-wave wall wart solution is not as good as the Full Wave Center Tap. The
>FWCT has a ripple frequency of 120Hz (not 60Hz) which means the filter caps
>are replenished with current more often, and the same size cap will give more
>filtering. 

There is no problem whatever with the 'two half wave rectifier' solution
if the voltage on the primary filter cap never goes 
below (regulator voltage + headroom).
 
Of course, I agree with everything about the decoupling caps.
And, it doesn't hurt to read the National Semi app notes and data sheets.
Finally,if your earth isn't a proper 'star' layout, that's asking for trouble, 
half, double or whatever rectifier.

paul perry melbourne australia