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Old 30th June 2020, 07:54 PM   #3251
grataku is offline grataku  United States
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Ain't nobody got time for flimsy enclosures ;-)
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Old 30th June 2020, 07:58 PM   #3252
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The diyAudio First Watt M2x
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Ain't nobody got time for flimsy enclosures ;-)

I'm feeling a bit of inadequacy when admiring that fine piece of metal.
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Old 30th June 2020, 08:13 PM   #3253
TungstenAudio is online now TungstenAudio  United States
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Given the proximity of the Edcor transformers to the middle of the case, you will definitely need to use a well shielded power transformer. The Antek AS-4218 has a steel outer case available for it. Place it as far forward as possible. The store PSU boards are a good start for a decent supply. Your choice of rectification will yield about 22V to 23V on the rails.
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Old 30th June 2020, 09:04 PM   #3254
grataku is offline grataku  United States
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@Tungsten,
the case maybe wider than it appears. Here is a shot with the trafo and the butta' board.
I went for the mosfet position being centered onto the heatsink for optimal cooling. I can build something arounf the trafo if it needs it.
I am used to transformers outputting more Vs than needed and being undersized in Cu meaning they wind a whole bunch of extra coils so that the voltage settles to the rated V under full load. Historically, I always upsized my transformer chasing that deeper bass...
I decided to not do that this time.
I am using an antec 200VA 18+18 which looks plenty big enough to support the system. We'll see how that goes.
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Last edited by grataku; 30th June 2020 at 09:08 PM.
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Old 30th June 2020, 09:50 PM   #3255
TungstenAudio is online now TungstenAudio  United States
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Unfortunately a single Antek AS-2218 will not be sufficient for that build. A pair would work if you were willing to go with a dual mono configuration, without the SLB CapMx boards. Due to the voltage dropout of the capacitance multiplier, you would need transformers with 20V secondary windings to get the preferred voltage on the rails.
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Old 30th June 2020, 10:00 PM   #3256
grataku is offline grataku  United States
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We'll see. I don't plan to use the cap multiplier for now. Worse2worst I will get a new trafo but I will make this work.
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Old 30th June 2020, 10:09 PM   #3257
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We'll see. I don't plan to use the cap multiplier for now. Worse2worst I will get a new trafo but I will make this work.



I have a 3218 sitting on my bench, if ya need it, lemme know.
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Old 30th June 2020, 10:29 PM   #3258
grataku is offline grataku  United States
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Thanks for the offer!
3218 is only 300VA and power is not the limiting factor here. IMO anything above 200VA is a complete waste for this amp. If I go with regulator I may need to notch it up to 20 or 22V.
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Old 30th June 2020, 10:35 PM   #3259
thompsontechs is offline thompsontechs  United States
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Thanks for the offer!
3218 is only 300VA and power is not the limiting factor here. IMO anything above 200VA is a complete waste for this amp. If I go with regulator I may need to notch it up to 20 or 22V.

Well, in that case, I have 2x22 sitting on the bench.
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Old 30th June 2020, 11:38 PM   #3260
grataku is offline grataku  United States
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You 'goldy locks' it? 18 too little, 22 too big 20 just right? :-D
 

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