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Old 16th September 2009, 01:06 AM   #4871
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Quote:
Originally Posted by Nelson Pass View Post

I usually correct in halves. In the case you cite, I would
set the cold offset to -20 mV

aaahhhhaaaa said Mr. Moto. "Kimono go up little bit at a time...keep client interested."
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Old 16th September 2009, 06:11 AM   #4872
sangram is offline sangram  India
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Thanks again, Mr. Pass. I will be building this winter for sure - we are currently seeing room temps of 35 degrees C, so a Class A is kind of out of the question!
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Old 16th September 2009, 02:14 PM   #4873
jazz is offline jazz  Netherlands
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Default another one alive

Hi,

last weekend I fired the f5 proto. The first to use the proto testbed, getting a cheap trannie made this go in to higher gear. I'll be mounting some fans to the heatsinks to allow higher dissipation and thus try stuff like the alephJ and other First watt designs. Guess I'll be working backwards.

I really like the uniform psu and cooling format used by mr Pass. This way I can use whatever I have already and try out different designs rather easy and inexpensive. Something I really like!

below some pic's

regards,
Joris
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Old 16th September 2009, 02:45 PM   #4874
AndrewT is offline AndrewT  Scotland
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try rotating the amp PCBs to the vertical and fit the output devices direct to the back of the heatsink without needing the intervening clamp plate.
The devices will run cooler and the sink will run slightly hotter.
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Old 16th September 2009, 03:12 PM   #4875
jazz is offline jazz  Netherlands
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Hi Andrew,

Thanks for the suggestion. I know the thermal resistance will decrease when using your method. However, this way I can still mount other designs above the F5 using a similar construction. This makes it easier to compare designs (the main reason I used faston clips and such). Just switch off, swap leads and switch on again...

The testbed is not meant for ultimate sound quality or perfect cicuit parameters. Just to get to grips with a design (adjustment etc) and an initial impression of the sound. Cooling just needs to be sufficient to not blow the fets/transistors most of the time.

Anyway, thanks and I'll remember when building the final design of choice.

regards,
Joris

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Old 17th September 2009, 03:36 PM   #4876
sekess is offline sekess  United States
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Default Power Supply Caps

Has anyone had any experience with these power supply caps?

http://www.bgmicro.com/index.asp?Pag...D&ProdID=12875

That's a lot of capacitance for $10.

Thanks,
Steve
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Old 17th September 2009, 04:15 PM   #4877
AndrewT is offline AndrewT  Scotland
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it's worth spending $40 just to find out.
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Old 17th September 2009, 04:23 PM   #4878
sekess is offline sekess  United States
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Default Power Supply Caps

$40 bucks is ok. But, I usually do eveything in dual mono. So, it would be $80. But then, that is one hell of a lot of capacitance for these amps.
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Old 17th September 2009, 05:53 PM   #4879
sekess is offline sekess  United States
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Default Power Supply

2 questions (one specifically for Andrew T):

1. Hey Andrew, if I built a power supply with a 600VA transformer and used 4 of the above mentioned caps to give 272,000 uF total (136,000 per rail), I would assume that you would recommend using a thermistor in the primary as well as the secondary of the transformer -- as per your post 3008. If that is in fact the case, what resistance would you suggest for the thermistor in the secondary of the transformer?

2. I like the idea of having the power supply seperate so that I can easily try out future amps without building up power supplies each time. It is for that reason that I'm thinking of placing the power supply in its own enclosure seperate from the amplifier modules. Is there any particular length of the umbilical that I sould not exceed?

Thanks,
Steve
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Old 17th September 2009, 06:12 PM   #4880
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Looks like they are all gone now.
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