What are the reverse voltages here ?

MikeML

Joined Oct 2, 2009
5,444
Not clear if you mean 20Vrms or 20Vp-p?

If 20Vp-p, then here are all the relevant Voltages and Currents. Note that there is never any reverse voltage across the LEDs, so your reverse diode is redundant.

339.gif

Same without the capacitor...

339nc.gif
 

Thread Starter

Externet

Joined Nov 29, 2005
1,517
Thanks.
20 VRMS supply. The LEDs are rated for a maximum of 5 Vr. Are they safe to operate this way considering the negative excursions of the AC ?
 

MikeML

Joined Oct 2, 2009
5,444
Did you miss this sentence:

Note that there is never any reverse voltage across the LEDs, so your reverse diode is redundant.
 

Sinus23

Joined Sep 7, 2013
246
You already have a half wave rectifier with a smoothing capacitor. The voltage that the led are experiencing is only positive.
 
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