The Yellow Wire Mod ... Heats Up!
Rhodes- Thanks for Vref output voltage adjustment tip.
I just received and email from Michael and he is a tad concerned with the extra heat generated hooking to the yellow 12V AC tap. I found that while "yes" the aluminum case of the DC-30 does get quite a bit warmer ... it is not "hot" to the touch. (I.E. I can keep holding my finger on the case).
However ... Michael was more concerned with the 1/4 watt resistor's for the TL431 voltage regulators holding up under this current load. There are 2 TL431 and 2 output transistors inside the DC-30, one for 5V output to the receiver board and one 7.55V for the DAC chips. Adjustable via the blue variable resistors, reference Pat's picture on page one. Looking at the PDF it looks like Michael has the DC-30 set up for Shunt Regulation.http://www.fairchildsemi.com/ds/TL%2FTL431.pdf
Damn, there never seems to be a free lunch when it comes to electonic's.
For now I am enjoying the increased bass dynamics and slam of my "Yellow Wire Mod" on the Chameleon. However I am keeping a close eye on those little blue resistors in questions. So far no discoloration or signs of overheating. I will keep everyone posted on what the final fix will be.
Let's just hope in the interim that my Chameleon doesn't turn to a smoke color. But hey, this is the grey area that us modder's are forced to live in. No pain ... no gain!
The important thing is that the Symbiotic relationship between the designer and modder's is hard at work. This on the other hand is "very cool"!!!