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Old 20th March 2013, 10:39 AM   #1631
buzzforb is offline buzzforb  United States
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/Is PSUD an easy way to check this out?
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Old 20th March 2013, 10:43 AM   #1632
AndrewT is offline AndrewT  Scotland
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measure the effectiveness.
Don't try to simulate the ultra complex interactions of temperatures and Starting Transformer with varying resistances and varying emfs with varying capacitor charge.
Look at some of Gootee's simulations for the steady state PSU capacitance AFTER the added resistor has been bypassed to get an inkling to the complexity involved.
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Old 20th March 2013, 01:14 PM   #1633
Rixsta is offline Rixsta  United Kingdom
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F5 Turbo Builders Thread
Hey, the F5 turbo V1 im trying to find out how much more heatsink is needed ?
i was going to use the 4U case here for the Standard F5
modushop.biz

How would that do do you think ?
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Old 20th March 2013, 01:33 PM   #1634
AndrewT is offline AndrewT  Scotland
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That page does not state the heatsink Rth s-a
Do you have that figure?
Do you know at what delta s-a that the Rth s-a applies?
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Old 20th March 2013, 01:44 PM   #1635
Itsmee is offline Itsmee  England
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A 4U is OK for the standard F5, but I would use a 5U for the F5T.
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Old 20th March 2013, 02:08 PM   #1636
nrg2009 is offline nrg2009  United States
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Quote:
Originally Posted by AndrewT View Post
measure the effectiveness.
Don't try to simulate the ultra complex interactions of temperatures and Starting Transformer with varying resistances and varying emfs with varying capacitor charge.
Look at some of Gootee's simulations for the steady state PSU capacitance AFTER the added resistor has been bypassed to get an inkling to the complexity involved.
Andrew, you are saying measure Amps running through the primary using a softstart? I would like to measure it if I can. Do I need anything more than a digital Multi Meter? You are saying that a CL30 on the primary is not that effective, and should be on the secondary?
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Old 20th March 2013, 02:42 PM   #1637
henryve is offline henryve  South Africa
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Quote:
Originally Posted by Itsmee View Post
A 4U is OK for the standard F5, but I would use a 5U for the F5T.
Also make sure you use at least the 400mm model. The 300mm will not have enough disappation because the fins on their heatsinks are just not long enough to handle all the heat.
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Old 20th March 2013, 02:43 PM   #1638
AudioSan is offline AudioSan  Norway
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C/W rating pr side of the 4U chassis is: 0.31C/W for 300mm. and 0.19C/W for 400mm
5U is: 0.20C/W for 300mm, 0.14C/W for 400mm and 0.115C/W for 500mm.
this numbers i guess is at about 75-80C above ambient.
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Old 20th March 2013, 02:48 PM   #1639
henryve is offline henryve  South Africa
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To give a comparison: on my KSA50 clone I use heatsinks on each side that are 200mm tall and are 510mm deep. The extrusions has a solid area that is 16mm thick and fins that are 60mm, and are spaced 13mm apart. Each fin taper from a root of 5mm to tip of 1mm. The KSA50 is biased at the moment to deliver 55W into an 8R load and I can keep my hand on the sink for only 15secs.
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Old 20th March 2013, 02:56 PM   #1640
AudioSan is offline AudioSan  Norway
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that is not a good comparison. whats the total dissipation of the amp? and howe did you arange the outputs? that is the key(s).
and of course, Your ambient temp will have alot to say.

Last edited by AudioSan; 20th March 2013 at 03:01 PM.
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