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Old 13th February 2013, 06:29 PM   #2691
Salas is online now Salas  Greece
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Faked American Fets for K170 usually have some symbol in there that the dodgy fellas leave there and only grind and change the face print. That is why I asked you to check. Another subtle clue is at the pins where they enter the plastic. If genuine Toshiba you can see a hint of copper color that is not completely tinned.
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Old 13th February 2013, 06:40 PM   #2692
stajo is offline stajo  Sweden
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My son just asked me why I'm taking pictures of stupid electrical stuff. "Who want to look at those?" I had to confess that I'm a nerd
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Old 13th February 2013, 06:43 PM   #2693
Salas is online now Salas  Greece
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Tell him you teleport silicon souls to Greece for a holiday.
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Old 13th February 2013, 06:48 PM   #2694
stajo is offline stajo  Sweden
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Funny I just helped him construct a teleport glyph in Minecraft. I wish it had lead to Greece tho. Sorry for the OT.
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Old 15th February 2013, 07:38 AM   #2695
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Anyone ever try feeding one of these with laptop power supply bricks? Most are 19v which might be a little low, but perhaps less losses since you could skip the rectifiers. Just a thought since I have a couple lying around.
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Old 15th February 2013, 11:57 AM   #2696
Salas is online now Salas  Greece
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Capacitors coupled B1 takes monopole, this one takes bipolar PSU. Better avoid switching PSUs anyway unless it is essentially practical to use one. And better filter it further. Even DC to DC converter regs produce traces of their inner works along their DC output.
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Old 15th February 2013, 05:09 PM   #2697
Salas is online now Salas  Greece
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...And here is an output noise example from some LM2596 buck regulator PCB I had around. Has the datasheet output filtering configuration. 10V input 5V output -no load- in this take. High efficiency step down switcher yes, steady DC output yes, much current capability yes, clean enough for hi-res audio PSU use rather no.
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File Type: png LM2596S_Noise.png (76.0 KB, 191 views)
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Old 17th February 2013, 10:35 AM   #2698
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That's pretty nasty looking. Thanks for sharing.
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Old 17th February 2013, 10:40 AM   #2699
Salas is online now Salas  Greece
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That ripple goes to 60mV peak to peak when it gives 1A. It receives linearly regulated DC input in the test, I don't know if it adds even more stuff if fed from just bridge and capacitor. Typical laptop bricks can be worse or bit better but that's the deal more or less. Silent SMPS are costly and sophisticated. Like those for Hypex Ncore amps.
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Old 17th February 2013, 10:52 AM   #2700
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I have been following the nCore thread for some time (a future project). The consensus is that the nCore SMPS is as good as a linear PS. Expensive, but it proves that a SMPS can be made well enough for audiophile applications.
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