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Chip Amps Amplifiers based on integrated circuits

LM3886 Power Supply
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Old 14th September 2018, 08:04 AM   #11
00940 is online now 00940  Belgium
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JM Fahey is very generous, at more than 1VA per audio watt. I wouldn't call that penny pinching. 2/3 of a VA per watt is suggested per Dan Fraser for AB amps and 1/2 for class D amps. That's BTW in line with Hypex suggesting a 160va transformer for a stereo ucd180.

Edit: but if indeed the goal is to reproduce sinewaves forever, then the rules change.
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Old 14th September 2018, 01:05 PM   #12
Mark Johnson is offline Mark Johnson  United States
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I just realized that some members may not know, Antek now sells to individuals through an eBay storefront. (And to businesses through their website). Everything is "Buy It Now" and at least for me, in the US, it's free shipping.
100VA toroid, $29


200 VA toroid, $44


300 VA toroid, $53


400VA toroid, $62


500VA toroid, $55
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Old 14th September 2018, 01:11 PM   #13
FauxFrench is online now FauxFrench  France
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Very decent prices. If no transportation costs, super. 500VA is cheaper than 400VA and almost the same as 300VA?
For EU: Transportation costs? Import (customs) fees? TVA?
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Old 14th September 2018, 01:22 PM   #14
00940 is online now 00940  Belgium
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I would stick to toroidy.pl in Europe. The prices of the antek are similar to toroidy audio grade line and shipping/taxes aren't a problem.
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Old 14th September 2018, 01:59 PM   #15
FauxFrench is online now FauxFrench  France
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I wasn't aware of this supplier. Seems good with a huge choice and prices similar to Antek. Unfortunately transportation costs in the order of 50% on top.
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Old 14th September 2018, 02:23 PM   #16
bandol83 is offline bandol83  France
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I buy regularly Transformers from Toroidy, either directly for special version (very nice) or from TME ( Transfer Multisort Elektronik - Composants electroniques ) and shipment prices are very reasonable

Marc
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Old 14th September 2018, 02:57 PM   #17
FauxFrench is online now FauxFrench  France
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Quote:
Originally Posted by bandol83 View Post
I buy regularly Transformers from Toroidy, either directly for special version (very nice) or from TME ( Transfer Multisort Elektronik - Composants electroniques ) and shipment prices are very reasonable
Marc
You are indeed right about TME, more reasonable shipping costs. I also appreciate prices in EUR and not Zloty. For long I only knew of Conrad and RS-online.
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Old 14th September 2018, 03:50 PM   #18
isbrunobarbato is offline isbrunobarbato  Brazil
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Quote:
Originally Posted by Mark Johnson View Post
I just realized that some members may not know, Antek now sells to individuals through an eBay storefront. (And to businesses through their website). Everything is "Buy It Now" and at least for me, in the US, it's free shipping.
100VA toroid, $29


200 VA toroid, $44


300 VA toroid, $53


400VA toroid, $62


500VA toroid, $55
For me it is not possible to buy things outside of Brazil, the transformer freight of 200VA for example, would cost me $ 69.50 and when I arrive in Brazil, I have to pay 60% of the value of it in taxes.
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Old 14th September 2018, 03:55 PM   #19
Mark Johnson is offline Mark Johnson  United States
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Then you need the advice of an experienced diyAudio builder, who also lives in Brazil.
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Old 14th September 2018, 03:56 PM   #20
isbrunobarbato is offline isbrunobarbato  Brazil
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Quote:
Originally Posted by Mark Johnson View Post
Here in the US where a gigantic variety of transformers are easily purchased, and shipping is cheap, and taxes/customs are negligible,

sure, hobbyists routinely buy transformers that are bigger than necessary. This means we don't need to include Thermal CutOuts in our circuits, and we don't need to perform intimidating calculations, and we don't need to worry about what happens if somebody connects a lower-than-expected-impedance loudspeaker.

In other locales, perhaps the proletarian wisdom of penchpenny tightwads like JM Fahey might be worth paying attention to. Every unnecessary VA that you don't buy, is money back in your pocket. Maybe a significant amount of money.
I can understand that excess power is wasteful, I will choose to use a 250VA transformer, the price difference between a 200VA and a 250VA is insignificant.
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