Olin,

I think what you meant to say originally was that the CATHODE should be
moved to the other side of the resistor.

Foster

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Olin Lathrop
> Sent: Tuesday, October 02, 2001 7:21 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Powering LEDs from AC power line.
>
>
> > But if you move the anode side, without moving the
> > cathode, the diode is no longer in reverse parallel
> > with the LED.  For tat matter, it wouldn't be parallel
> > with the LED at all.  Wouldn't that defeat the purpose
> > of putting it in the circuit?
>
> The diode is still reversed accross the LED with a resistor in between.
> With the diode directly accross the LED, the cap charges/discharges both
> ways thru the resistor.  With the diode accross the resistor and
> LED instead
> of just the LED, the cap charges without the resistor on the
> negative slope.
> The cap current then goes thru the resistor and LED on the positive slope.
> This is a little more efficient because the current only goes thru the
> resistor once.
>
>
> ********************************************************************
> Olin Lathrop, embedded systems consultant in Littleton Massachusetts
> (978) 742-9014, olin@embedinc.com, http://www.embedinc.com
>
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