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Old 20th December 2012, 04:15 PM   #61
Philfr is offline Philfr  France
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Hi JM,
At this time, I think build TA2050 in single rail..
You think it's better in dual in my case ?
Recharge it with one gel charger, batteries in parallel.
This system is not to listen to music all the day but for about ten hours per week.
Digital music : I use pc like a drive cause I'am working under ramdisk.
So I need a dac asynchronous usb with upsampling.
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Old 20th December 2012, 07:00 PM   #62
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Philfr View Post
Mooly,
Many people often ask me this question ..
Gelified battery are not missy, no liquid, no odors when charging.
I use "gel" batteries all the time (but not for audio). I was thinking messy as in having two or three separate batteries and the charging arrangements needed.

I see "TA2050" has crept in above Don't confuse me... do you mean TDA2050's or the Tripath TA2050 Class D amp.
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Old 20th December 2012, 07:21 PM   #63
Philfr is offline Philfr  France
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Sorry "D" is stuck in the keyboard
TDA2050, TDA2050, TDA2050, I'll write a hundred times..
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Old 20th December 2012, 07:31 PM   #64
Mooly is offline Mooly  United Kingdom
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So are we going with single rail as in the application note for the TDA2050. Its easier and safer on the speakers.
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Old 20th December 2012, 07:53 PM   #65
Philfr is offline Philfr  France
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Yes
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Old 21st December 2012, 07:16 AM   #66
Mooly is offline Mooly  United Kingdom
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That's good. If your not sure of anything just ask.
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Old 21st December 2012, 08:21 AM   #67
Philfr is offline Philfr  France
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Hi,
Below the schematic..
R3 is input impedance, I chose 27 Ko, but after if I want 10 or 47 just change value of R3..
Gain is 33, I read that it was 10 to 100, so 33 seems good for me..
C1 is Fc of input that mean about 3 Hz with 27 Ko and 2,2 uF..

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Old 21st December 2012, 09:13 AM   #68
Mooly is offline Mooly  United Kingdom
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That looks fine...

C7 could usefully be larger for extended bass response. I would suggest at least a 4700uf/35 volt cap and preferably 6800uf (particularly if the speaker impedance is low). Modern radial caps are small so there is no real problem. A 25 volt working voltage would be OK on 24 volt rails. The cap will see a steady no signal DC voltage of 24/2 (12 volts) and under signal conditions the amp output will stop a little bit short of the rails. C4 I would make at least 47uf.

To save keep working out cutoff frequencies try an on-line calculator,
calculators for electronic circuit design
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Old 21st December 2012, 12:59 PM   #69
Philfr is offline Philfr  France
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Thank's for link..
In fact formula for input and output is the same..
I had not observed this, so I keep 6800 uF for C7.
For input (C1), I would take 3,3 uF if I change impedance later.
I note C4=47 uF
What is R6/C6 ? In other schematic I observe different value for R6 (1 Ohm for ex).
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Old 21st December 2012, 06:04 PM   #70
Mooly is offline Mooly  United Kingdom
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R6 and C6 are commonly known as a "Zobel" network.
Scroll down to the bottom of the page where it says "Zobel networks and loudspeaker drivers".

Zobel network - Wikipedia, the free encyclopedia

Almost all solid state amps have this network connected to the output and that brings a practical point up. The speaker ground return and the zobel return should really go back directly to the power supply main ground and not via the other components that also connect to ground. Thats because relatively high currents flow here and they can interfere and modulate the other points if they are all just connected "along the same piece of wire or PCB".

Values vary although I would stick to the recommended parts. They make no difference to the sonics of the amp and in practice its not that critical as long as they are there. 10 ohm and 0.1 uf are very common values for many discrete power amps. Without them many amps just oscillate wildy and destructively.
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