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Old 2nd March 2013, 07:54 PM   #1601
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by FdW View Post
No, I do not but in this (and exactly this) situations, it may be that a higher Cob is more preventative towards oscillation, and then again, it may be the other way around. That is why I am happy to someone using high Ft low Cob transistors in the PSU (as I told Salas (at the least tried to tell (o.k. now I am over-explaining things (I got to stop (now ))))). My initial guestimate was, use medium Ft medium Cob transistors, given the fact that this would not lead (ever) to oscillation into the 100's of MHz's, that would be bad, most people would not be able to spot those. As you can see (I hope) a lot of thought goes into these things, and still one is not able to mate the 'perfect' choice

P.s. Please make next a long question, for a short and easy answer
Way cool answer..... I like it
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Old 2nd March 2013, 08:09 PM   #1602
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Salas View Post
P.S. You guys did you specify the local terminating 10uF lytics ESR by any chance? That can be a variant between types to give instability if its not indifferent by design.
Maybe a small resistor in series.... EL Zobel
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Old 2nd March 2013, 08:34 PM   #1603
FdW is offline FdW  Netherlands
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This was a mistake, next time I would specify a (greater than) 500mOhm ESR or series resistance (this is more specific ).
Yes, that is what I was saying, the 500mOhms external (from the capacitor) resistor (having it's own set of holes in the PCB)
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Old 2nd March 2013, 08:47 PM   #1604
Salas is offline Salas  Greece
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Think tantalum also.
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Old 2nd March 2013, 08:49 PM   #1605
Nick77 is offline Nick77  United States
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Sorry these aren't lite up, i dont have a lab supply or test equipment. They are being shipped off to a buddy to lend a hand, unless someone in Austin Tx can help me out.

Cant wait to hear these, thanks to all.......

Click the image to open in full size.
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Old 2nd March 2013, 08:53 PM   #1606
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Nice build, i hope it works.
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Old 2nd March 2013, 08:56 PM   #1607
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Nick77 View Post
Sorry these aren't lite up, i dont have a lab supply or test equipment. They are being shipped off to a buddy to lend a hand, unless someone in Austin Tx can help me out.

Cant wait to hear these, thanks to all.......

Click the image to open in full size.
Looks nice and clean, we will see what happens next (good chance it just works).
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Old 3rd March 2013, 01:20 PM   #1608
Salas is offline Salas  Greece
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Default PSU test

Made a PSU unit with 2SA1930/2SC5171 TOSHIBA VAS grade BJTs. PMOS IRF9610 NMOS IRF610. 10uF caps = Nippon KMQ 100V 105C. 100uF caps = Nippon KY 25V 105C. Vin-Vout for reaching 140mA CCS (load demand will be 70mA per rail) = 7V. Rise above ambient on sink behind the power semis = 26C (48C with 22C room temp). Drift = -90mV over settling time = 20 minutes. No parasitic oscillations whatsoever. I.e. this PSU build is stable on its own before connected to its target load.

Click the image to open in full size.

Notes: 1. Preparing and aligning the sink is a royal PITA. 2. Its sinking capacity is borderline. I would stay +6V to +7V Vin at most. I.e. 2X18VAC should do.
3. Is there statistical info about using the several 1uF film caps on the phono rails or not when oscillations happened?
4. Use short path to ground when probing for oscillations.

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Old 3rd March 2013, 01:24 PM   #1609
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I want some of those fancy new LED's. The sinks work great on a certain other shunt regulator. Its about time for me to start pulling mine together. Thanks for all the folks trying hard to make the build easier for us noobs. I have heard great things about it.
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Old 3rd March 2013, 01:40 PM   #1610
Salas is offline Salas  Greece
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The fancy LEDs are my drawer NOS and the last ones go to the other channel almost magically self counted for it. Bit on the low side also, I will kick the 330R up a bit.
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