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Old 2nd October 2012, 11:26 AM   #1011
Salas is offline Salas  Greece
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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.
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Old 2nd October 2012, 11:32 AM   #1012
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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
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Old 2nd October 2012, 11:47 AM   #1013
Salas is offline Salas  Greece
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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.
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Old 2nd October 2012, 12:10 PM   #1014
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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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Old 2nd October 2012, 12:18 PM   #1015
Salas is offline Salas  Greece
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Let us know in due time in the builds thread then.
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Old 2nd October 2012, 04:18 PM   #1016
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@Salas,
sorry, my english is not the best and i understood not all.

I think i must use the BJT package with your explanation or i am wrong (appendixes 1 part b)?
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Old 2nd October 2012, 04:38 PM   #1017
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Quote:
Originally Posted by carsten.witt View Post
@Salas,
sorry, my english is not the best and i understood not all.

I think i must use the BJT package with your explanation or i am wrong (appendixes 1 part b)?
Carsten, I can ask my friend Gerd to translate for you in Private message between us.
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Old 2nd October 2012, 04:41 PM   #1018
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Thanks, that would be fine!
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Old 3rd October 2012, 09:27 AM   #1019
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@gerd,
thanks for your help.
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Old 3rd October 2012, 10:56 AM   #1020
Stixx is offline Stixx  Germany
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I am happy to help as well since I just finished a 5V Mosfet SSLV ( and have it working to power JP's ES9023 DAC).

Just shoot me a PM (schreib' mir einfach eine PM )...
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