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GB Thread for Salas SSLV1.1 BiB shunt reg

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#1,010
Hi all together,

i want to power up the WaveIO (USB/I2S) from Lucian with one regulator (ca.500mA).
My question, is it possible with the parts from the GB "IRF (5.5V-45V)" to get/adjust the 5V for WaveIO or should i better use the "BJT (2.5V-5.5V)" package?
For my other components, "BlackCrow" and mojo2, is it clear for me (1 x 12V, 2 x 18V).


Thanks and Regards ........Carsten
 
#1,011
Carsten, use 2 red or green ~1.9V leds and one 1N4007 or alike diode with its cathode mark reverse to the zener's cathode printed in the 'see text' area. Jumper all unused positions in that area, and even the Mosfet will do it. Check with dummy first not to kill any sensitive digital, it should be pretty stable and near 5V.
 
#1,012
Interesting Salas, the BiB guide recommends the two red LED's and a 220 resistor which worked quite well for me. Does changing the resistor for a forward biased diode make it quieter or more stable perhaps? I'm thinking of changing to it. (I'm also supplying circa 500 mA at 5 v)

John
 
#1,013
Hmm, resistor damps it a bit which is a plus for the filtering, I suggested the diode as a quick alternative to Carsten for checking all is well with his Mosfet sample and 5V. With the resistor if the Jfet CCS chances to be a bit happier takes a couple of iterations if not allowed to pass 5V. As for the drift when the 220R contributes only 0.6V the diode's stability gain for warm up will be rudimentary. You can try it if you think you may pick it up subjectively and choose though. The impedance of the ref would change a bit mainly, noise no, the lytic filters hard and the Johnson of a 220R is peanuts.
 
#1,014
Thanks Salas, not a "cut and dried" improvement then but who knows I'll give it a go and see what if anything it does subjectively. I had no difficulty holding the 5 volts steady but I was careful to select the 2SK117's as per the guide. Supplies as Squeezebox Touch quite comfortably and gives an audible improvement on the supplied Switch mode wallwart.

John
 
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