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Old 27th December 2010, 03:21 PM   #551
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Sorry to go on about the power supply but is there a reason for the four 1ohm resistors being placed in parallel between the two capacitors? Does one get the same affect using a single resistor say 0.25 ohm at 25W?
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Chris
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Old 27th December 2010, 03:40 PM   #552
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You get the same filtering effect. Watch the derating factor if you don't mount the 25W resistor to a proper heat sink, though. For example, a Vishay Dale RH025 must be derated by at least 50% if you don't mount it. Mounting it to a reasonably thick chassis is enough, but you still must derate it slightly.

With 4 x 3W resistors, you spend a dollar instead of 6 and don't need to drill and tap mounting holes, etc. I'm cheap and lazy, you know which way I'd go.
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Old 27th December 2010, 04:17 PM   #553
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Nothing wrong with minding the pennies.
When you talk of 'derated' do you mean you have to reduce its rated resistance or power?
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Chris
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Old 27th December 2010, 04:41 PM   #554
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Derating refers to power handling. For example see http://www.mouser.com/catalog/specsheets/rhnh.pdf A 25W resistor would be good for unmounted operation.
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Old 10th January 2011, 04:08 PM   #555
Forsman is offline Forsman  Sweden
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Default BA PCBs

Does any one have an update on how things are going with the new batch of BA boards?

Kind regards
/Forsman
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Old 10th January 2011, 06:55 PM   #556
Variac is offline Variac  United States
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They will be in the store in about a week, maybe less, plus lots more cool boards.
At the moment they are sitting in my living room, so they DO exist!

Mark
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Old 10th January 2011, 07:01 PM   #557
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Old 10th January 2011, 08:06 PM   #558
Forsman is offline Forsman  Sweden
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Quote:
Originally Posted by Variac View Post
They will be in the store in about a week, maybe less, plus lots more cool boards.
At the moment they are sitting in my living room, so they DO exist!

Mark
lovley, I will keep sharp look out at the store.

/Forsman
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Old 11th January 2011, 09:57 PM   #559
Forsman is offline Forsman  Sweden
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Default Heat sinking

Ive found a couple of nice heat sinks for a reasonable price but Im not sure they will suffice. What is your take on a pair of these, are they sufficient or do I probably need larger ones?

12*4*1.56 in

Click the image to open in full size.

Click the image to open in full size.

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kind regards
/Forsman
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Old 11th January 2011, 10:10 PM   #560
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I dont think so. If you could stack another set on stop you may be talking. Thermal epoxy could be used for that.
Alternatively, you could just bias lower and use 1 or 2 outputs pairs.
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