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How simple can an audio computer be? |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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Linear power supplies are wasteful of power to start with, but because the EU voltage range goes from 207V to 253V and I have to meet with CE and UKCA (soon), then everything must be overrated. Overrated = costly = big/hot/both = non-stock voltage transformers. On that last item, my transformer manufacturer grew and grew, and with it, lead-times. 35 years loyalty only paid dividends until the owner retired. Samples must now be paid for, usually in three figures, and delivery takes 8 - 16 weeks!
Another problem is the legality, that a single output voltage linear PSU is not legal (in the UK, EU and certain American states). It must have at least two different output voltages available for use at the same time - further complicating design. Kits must also comply!
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Sylvain
Senior Member Joined: 18 Jan 2010 Status: Offline Points: 481 |
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Is the venerable Transformer at fault or it's effect in the domestic power supply together with wasteful use of energy. Can ' switch mode' be better designed to produce Linear output without noise or a combination of the transformer and inductors but UNLESS the market shows a DEMAND worthy of investment the '' brains of Britain '' will chose 'SILENCE'' and Swithmode' readily available from Shenguang...and fa warehouse stock full for bitcoin.
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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No. More than a century of British blindness! I shall not detail any of it here, save to say that I've witnessed, mostly first hand, our technological design and manufacturing being gradually but severely trashed for the past 40 years. We became the opposite of successful - order takers instead of order makers. |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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Any users of the Pi2AES here? Any good?
I just made an impulsive purchase of the Pi2AES Lite, to try with the DAK 5V 3A supply and my Pi3B+. Shall compare it to the Pink Faun soundcard.
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We do not see things as they are. We see things as we are.
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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The hat takes the I2S from the pi (parallel audio data) and using a WM8804 outputs S/PDIF (serial audio data) via coax or optical. The "magic smoke" is contained within the WM8804 (R.I.P.)
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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Parallel audio data = data and clock signals are on separate lines?
Serial audio data = data and clock signals are on the same line? I think this is a safer choice than the Digione Signature. Low risk; if it sucks, sell it on.
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We do not see things as they are. We see things as we are.
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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System clock, bit clock, LR clock, data, so I call it parallel. The WM8804 encodes it to one wire for coax or optical transmission. At the other end there is a decoder which splits it back. The WM8804 was particularly good at doing both - a codec - but Cirrus Logic swallowed Wolfson. Both Cirrus and Wolfson are/were fabless "manufacturers" so when things get/got difficult, chips disappear. The 4 PCM lines are then applied to a DAC. The WM8741 is also gone for good. So it's a case of looking at what proper manufacturers (Texas/Analog Devices) do to fill the gap, if they can be bothered. |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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