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Old 16th August 2011, 03:35 AM   #821
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Default My F4

Just finished over the weekend. Back to enjoying the music...

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(Copy of post in the F4 thread: hope that's not breaking the rules...)
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Old 16th August 2011, 05:34 AM   #822
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Sweet! Are your transistors staying cool?
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Old 16th August 2011, 01:31 PM   #823
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Sweet! Are your transistors staying cool?
Not as cool as I'd like: with about 205mV across the .47 ohm resistors, the heatsink is getting pretty hot: I have to be a bit determined to keep my fingers on for 5 seconds . I will do another round of adjustments now everything is wired up and I may take the bias down a fraction.

I used all the heatsink I had...

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Old 16th August 2011, 06:09 PM   #824
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Tim, also keep a close eye on those in-rush limiters (thermistors). Depending on your amps operating condition, they can run very hot--and it looks as though you have them mounted on/near wood.....

Unless you're into the aromatherapy of burnt pine, this might be a problem....

Ken
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Old 16th August 2011, 06:13 PM   #825
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Quote:
Originally Posted by timbarnes View Post
Not as cool as I'd like: with about 205mV across the .47 ohm resistors, the heatsink is getting pretty hot: I have to be a bit determined to keep my fingers on for 5 seconds
You have 6 devices so the chip temperature is not likely to get too hot.

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Old 16th August 2011, 07:47 PM   #826
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one of my Aleph2 monoblocks almost done. it is up and running.
and running some how cool about 18-20C above ambient
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Old 16th August 2011, 07:50 PM   #827
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Tim, also keep a close eye on those in-rush limiters (thermistors). Depending on your amps operating condition, they can run very hot--and it looks as though you have them mounted on/near wood.....

Unless you're into the aromatherapy of burnt pine, this might be a problem....

Ken
I agree that this is very naughty!
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Old 17th August 2011, 12:04 AM   #828
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one of my Aleph2 monoblocks almost done. it is up and running.
and running some how cool about 18-20C above ambient
Very, very nice. Those large heat sinks are performing rather well, it seems.
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Old 17th August 2011, 01:20 AM   #829
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thanks yes they are. it takes well over 2 hours to warm up
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Old 17th August 2011, 06:09 AM   #830
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Quote:
Originally Posted by CanAm Man View Post
Tim, also keep a close eye on those in-rush limiters (thermistors). Depending on your amps operating condition, they can run very hot--and it looks as though you have them mounted on/near wood.....

Unless you're into the aromatherapy of burnt pine, this might be a problem....

Ken
Thanks: there's no sign of heat on the top: I didn't want to put my finger on them seeing as they are part of the power supply...
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