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Class D Switching Power Amplifiers and Power D/A conversion

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Old 24th May 2009, 02:17 PM   #61
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I'm sure they are caps, I measured 2.2nF and as they are followed by a 22k resistor to ground after them I think creates a filter?
They are not on the schematic and I don't know what else they could be?
Sounds better without to me!
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Old 24th May 2009, 04:56 PM   #62
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BJ 6CA are TVSs (Transient Voltage Suppressors), something like diodes that clip signals over 6V. BTW it seems that TC2000 can handle only 1,5Vrms... (look at the datasheet)
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Old 25th May 2009, 04:47 AM   #63
swkbkk is offline swkbkk  Thailand
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Thanks, Audio1st and Kingbowser for your suggestions and input.

I know nothing about electronics but if they are there to clip voltage above 6V to protect TC2000 then should I be a little scared about removing them?

But then, can the exact clipping function could be causing *something* to be missing in the sound?

BTW, am I right in thinking that those "BJ 6CA"s are connecting through the supplied RCA sockets (J7 and J8) only therefore if the input signal is provided through the terminal block (J9), then these "BJ 6CA"s won't be in the path and won't be doing their clipping function?
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Old 26th May 2009, 01:51 AM   #64
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Hi,

Has eanyone compared this to the virtue one or the winsome mouse. They should theoretically sound similar.

Thinking of getting the sureelectronics variety and soup it up rather than the built audiophile version.

Oon
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Old 26th May 2009, 07:20 AM   #65
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Quote:
Originally posted by swkbkk

BTW, am I right in thinking that those "BJ 6CA"s are connecting through the supplied RCA sockets (J7 and J8) only therefore if the input signal is provided through the terminal block (J9), then these "BJ 6CA"s won't be in the path and won't be doing their clipping function?

Hi swkbkk,

The TVS's are across the input so affect all inputs.

Thanks kingbowser for the identification..
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Old 26th May 2009, 07:43 AM   #66
swkbkk is offline swkbkk  Thailand
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Thanks Audio1st for confirming.

I will first have to find some time to go out and buy the basic tools like a multimeter, a soldering gun, etc before I can even start contemplating doing any kind of mods and then I will have to gather some courage to heat the solder up. I told you I am a lame newbie

I hope there will be more feedback on this issue by the time I get my tools though.
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Old 27th May 2009, 11:29 PM   #67
ttan98 is offline ttan98  Australia
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Hi,

This project seems to be quite interesting, to take a step further, Danny from GR research came up with a good idea of powering this amp with rechargeable battery cells(24V). He uses Virtue amp which has similar chipsets to the Sure Elect. TP2050/TC2000 combo.

Since this amp has about 85% efficiency it seem quite viable to use battery powered power supply and more importantly the sound quality is improved.

Those you have used this amp so far can you report any deficiencies(if any) in this board as I am thinking of buying one.

Cheers. Happy Listening.
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Old 28th May 2009, 02:11 AM   #68
vaughn is offline vaughn  United States
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Does this seem a good power supply for this amp?


http://cgi.ebay.com/ws/eBayISAPI.dll...lenotsupported
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Old 28th May 2009, 02:31 AM   #69
ttan98 is offline ttan98  Australia
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Quote:
Originally posted by vaughn
Does this seem a good power supply for this amp?


http://cgi.ebay.com/ws/eBayISAPI.dll...lenotsupported
Switching P.S introduces HF spurious signals into the audio circuitry not condusive towards high quality audio reproduction. This is common knowledge among audiophiles.

Go to this GR research for a review, comparing switching PS to battery pack.

http://www.audiocircle.com/index.php?topic=68341.0
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Old 28th May 2009, 02:33 AM   #70
Pano is online now Pano  United States
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It's a switching amp, there is already a ton of noise.
Batteries are OK, but a good switching or linear supply often sounds better - for power amps.
And batteries are not as quiet as you might think....
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