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Old 9th September 2019, 10:12 AM   #6391
astx is offline astx  Austria
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Originally Posted by smartx21 View Post
Do you mean those torroidal ones? They have another function in digital amplifiers. The output coil is wound around the output resistor, which is an usual approach.

The shown schematic has a fatal error - a short to GND for upper mosfet switch.
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Old 9th September 2019, 11:44 AM   #6392
spookydd is offline spookydd  France
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Originally Posted by kct View Post
Little heads-up, I have a 5 Channel Technics A5 Tribute coming up.

Here an illustration how this will look like when it is done finally, as this is going on for quite a while now.
Is this little fan all there is in there?

Where are the vents located to get air in and out?

With those modules 100% "indoors" in that big case, and with all the heatsinks having their fins aimed at the floor, the airflow is definitely not convective in nature and the only way to cool this off somewhat more efficiently is to heavily ventilate, in a forced manner.

Would cool far better with all the heatsink aimed in a way to have all their fins vertical, to use more natural convection. Having their fins in the "outdoors" would also be better than keeping all that totally enclosed.
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Old 9th September 2019, 12:12 PM   #6393
cumbb is offline cumbb
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Long time ago;-)

Trafo incl. first sieving in an extra case.
A relic of condensers, only 70 % capacity, in the amp-case.

Any simple SE-circuit, one stage only! No pres or further stages;-)
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Old 11th September 2019, 08:34 PM   #6394
kct is offline kct  Canada
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Originally Posted by spookydd View Post
Is this little fan all there is in there?

Where are the vents located to get air in and out?

With those modules 100% "indoors" in that big case, and with all the heatsinks having their fins aimed at the floor, the airflow is definitely not convective in nature and the only way to cool this off somewhat more efficiently is to heavily ventilate, in a forced manner.

Would cool far better with all the heatsink aimed in a way to have all their fins vertical, to use more natural convection. Having their fins in the "outdoors" would also be better than keeping all that totally enclosed.
I totally agree with your observation. Yes, these are little fans running very quietly providing some air currents as relaying on natural convection would not work well. I did extensive testing and IR filming to be sure the design trade-of is not impacting performance negatively. Mind you there is very little idle heat coming of the amplifier modules. Even with a modest load, which turns out to be quite uncomfortably loud, these modules barely reach 30 degrees C. Air vents are on the bottom and top of the case.
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Old 12th September 2019, 10:03 AM   #6395
apexaudio is offline apexaudio  Serbia
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Originally Posted by astx View Post
The shown schematic has a fatal error - a short to GND for upper mosfet switch.
TD1800 schematic corrected
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Old 12th September 2019, 10:46 AM   #6396
AudioSan is offline AudioSan  Norway
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A 5ch Honey Bagder in the making.
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Old 12th September 2019, 10:52 AM   #6397
astx is offline astx  Austria
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Originally Posted by apexaudio View Post
TD1800 schematic corrected
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Old 12th September 2019, 12:05 PM   #6398
bullittstang is offline bullittstang  United States
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A 5ch Honey Bagder in the making.
WOW!
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Old 12th September 2019, 09:56 PM   #6399
kct is offline kct  Canada
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A 5ch Honey Bagder in the making.
Nice !
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Old 17th September 2019, 01:21 PM   #6400
sasmit is offline sasmit  India
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Default an integrated amp with the now obsolete LME49810

Had bought some of the last LME49810's on sale , got around to building an amp a few weeks back. The output stage on 2 pairs of NJW1302/3281 per amp. Transformer's a 25-0-25 500VA. A tight fight in the chasis, locally made sheet metal chasis wiht an aluminium face plate. The aluminium face plate is machined from 10mm aluminium bar stock , needs a bit more finishing on the edges.
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