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[DPRG] PWM circuit question

Subject: [DPRG] PWM circuit question
From: Tony Ennis tony.ennis at twc.com
Date: Thu Dec 12 09:15:55 CST 2013

Hello, first time poster.

I found a PWM circuit on the DPRG site:

http://www.dprg.org/tutorials/2005-11a/

I am a perma-newb with electronics, and I like to at least try to 
understand how things work.

My question is with this statement:

"When the output (pin 3) goes LOW, capacitor C1 starts to discharge 
through the left side of R1 and D1."

C1 discharges... to where? how?  I'd expect a ground.  If pin 2 or pin 6 
of the 555 is the place, then current doesn't have to flow through D1.  
So that makes no sense.  Help please!


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