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Old 27th September 2010, 03:31 PM   #81
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Quote:
Originally Posted by GuidoR View Post
don't think
400mA times 24V is 9.6W
Means the devices would heat up to >80C + temperature rise of the heatsink. (22.5C ambient)

Keeping the dies under 100C would require a 2C/W heatsink for each output device.
Check for yourself how large the heatsink would be.
(or a 0.33C/W heatsink for 6 devices)
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Old 27th September 2010, 03:36 PM   #82
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Maybe a 12 or 15vac tranny would do well if you don't want a regulated supply. Just a SWAG.
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Old 27th September 2010, 03:40 PM   #83
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Juma, as described in the Serbian forum, used a Fischer SK 56 (30 x 15 x 4 cm) heatsink and reported a temp rise of 21°C.
That heatsink will suffice to dissipate the 9.6W x 6 without becoming too hot (>50-55°C)
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Old 27th September 2010, 03:49 PM   #84
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Means a minimum die temperature of 94C at 25C ambient.
Raise the dissipation to 9.6W and die temperature will reach 110C !
(me head count, do the exact math yourself)
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Old 27th September 2010, 03:51 PM   #85
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Old 27th September 2010, 05:45 PM   #86
juma is offline juma  Serbia
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As Jacco noticed, power dissipation was my primary concern when I decided to use cap multiplers to lower the PS voltage to +/-20V DC (the transformer I used is 2x19V AC). Not that these MOSFETs are that fragile, but I don't like running things on the edge - reliability is my fetish, I drive Japanese cars only... Soon I noticed that amp sounds better with cap multiplers so I kept them.
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Old 27th September 2010, 06:41 PM   #87
GuidoR is offline GuidoR  Italy
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Quote:
Originally Posted by juma View Post
amp sounds better with cap multipliers
Juma, you convinced me, thanks.

Jacco, as you quoted, I don't think, while you've done the math
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Old 28th September 2010, 05:50 AM   #88
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I've checked RS, Farnell and Mouser, but I can't find the output Mosfets. Any idea about their availability? Can they be substituted with K1058 and J162? Thanks.
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Old 28th September 2010, 07:04 AM   #89
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Old 28th September 2010, 08:26 AM   #90
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Quote:
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...Can they be substituted with K1058 and J162?...
It will work, but it won't be the same amp...
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