Whole thread and schematics here: http://www.diyaudio.com/forums/showthread.php?s=&threadid=72361&highlight="low+power+SE+amp"
So assuming I use a fixed bias, i smooth the + terminal to be pure DC, then I short it to the ground? then I connect the - terminal to the four cathodes, right?
That original link I posted has the diodes incorrectly drawn. Here is the correct version. Ground is connected to the + side for the diodes and caps, with the bias taken from the - side.
Sheldon
http://www.diyaudio.com/forums/showthread.php?postid=824221#post824221
Sheldon
http://www.diyaudio.com/forums/showthread.php?postid=824221#post824221
alexmoose said:
The output of the transformer is about 140vac. Gotta make that DC. The schottky diodes produce less noise than regular diodes, and are not expensive. You could probably substitute regular diodes with good results, as the current is pretty low.
If you are using a center tapped mains transformer and can afford to lose a few B+ volts, you can also do something like shown in the link below to make a - supply. This was for a CCS, so you'd need more filtering to make it quiet enough for a bias supply. The amp in this example draws about 180mA, so 0.18A*150R/2=13.5V at the junction of the two 75R resistors. This one actually is somewhat fail-safe, in that as the output tubes conduct more, the neg. bias voltage increases, in turn reducing the bias current. http://www.diyaudio.com/forums/attachment.php?s=&postid=622719&stamp=1113901355
Sheldon
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