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Old 9th February 2009, 09:17 PM   #71
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TDA8924 & TDA8920 amplifiers

Please, would anyone who has got one one of these amplifiers and tried them out care to comment on how they found them and what was the quality of the sound like?

Many thanks
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Old 9th February 2009, 10:19 PM   #72
Cristi is offline Cristi  Europe
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cirrus,

to answer to your question, i will quote from the amplifier module datasheets few charcteristics:
" TDA8920: Output Power: 2x70W at 4[, or 35W at 8[, with max. 0.1% THD+N, at +/- 27V Supply Voltage.
TDA8924: Output Power: 2x70W at 4[, or 35W at 8[, with max. 0.1% THD+N, at +/-27V Supply Voltage.
Output Power in Bridge mode: 160W at 4[, +/-24V or 135W at 8[, +/-27V Supply Voltage.
Audiophile sound Quality: 0.02% THD+N at 36W at 4[ or 20W at 8[.
Very good efficiency: Up to 90% at 2x35W at 8[ or up to 87% at 2x70W at 4[.
"
i consider them audiophile quality, and i also built my own system whic i use for listening with this amplifiers.

please send me an email request and i will send you the datasheets for them.
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Old 10th February 2009, 09:55 AM   #73
col is offline col  Australia
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Default TA3020 damaged 3300uF cap

Hi Cristi,

Is it possible to bypass the Nippon Chemi Con 3300uF 100v electrolytic Caps? I already have 20000uF per rail in my power supply, I think that should be enough.

I accidentally slipped and drilled through the side of one of the ones on the PCB


cheers,
col.
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Old 10th February 2009, 10:37 AM   #74
xaudiox is offline xaudiox  Philippines
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Talking Its Working!!

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Old 10th February 2009, 11:08 AM   #75
col is offline col  Australia
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Hi xaudiox,

Congratulations! nice case. How does it sound? Did you have any grounding issues? Mine sounded great when it was powering a fullrange set of speakers on it's own but as soon as I hooked it up to my crossover in my tri-amped system I had huge ground loop problem.

Now I have made another problem drilling a hole in one of the bulk storage caps when I was modifying the case

col.
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Old 10th February 2009, 01:03 PM   #76
Cristi is offline Cristi  Europe
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some manuals and schematics can be downloaded from the following links. as soon as write more documents i will upload them there.
http://www.connexelectronic.com/docu...ier_Module.pdf
http://www.connexelectronic.com/docu...ier_Module.pdf
http://www.connexelectronic.com/docu...fier_Board.pdf
http://www.connexelectronic.com/docu...escription.pdf

col, the capacitors can be replaced, prefferably with similar capacity and voltage rating capacitors. i would not advice to use the board without them, even if you have larger capacitors outside the board.
the ground loop problem can be solved by separating the amplifier ground power supply from the other stages ground power supply. also the board has star ground confiuration, and the star is connected to the mounting hole between the output inductors. also try to isolate the other ground connections form the chassis, and keep only the star ground.
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Old 10th February 2009, 07:57 PM   #77
xaudiox is offline xaudiox  Philippines
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Quote:
Originally posted by col
Hi xaudiox,

Congratulations! nice case. How does it sound? Did you have any grounding issues? Mine sounded great when it was powering a fullrange set of speakers on it's own but as soon as I hooked it up to my crossover in my tri-amped system I had huge ground loop problem.

Hi

Thanks. I've just finished putting it together and only managed to test it with my speakers for few minutes.. So far, impressions are very good.. They sound sweet, no hum, no thump..

I'm using 2x40Vac 500VA toroid, PS10K80 psu (upgrade caps to 18mF x 6pcs) and TA3020 amp..

Will test it thoroughly tomorrow morning..

thanks
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Old 10th February 2009, 08:19 PM   #78
valo is offline valo  Norway
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Default question about the LM4702 BPL kit

I see that you are using the Toshiba 2SC5200 transistor in the kit, so iam wondering if its the real transistor on the board or a fake
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Old 11th February 2009, 07:24 AM   #79
col is offline col  Australia
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Default TA3020 caps: 100v 3300uF Nippon Chemi-Con KMG series non-existant

Somebody please correct me if I'm wrong but according to this chemi-con list of the KMG series capacitors there doesn't exist a 100v 3300uf cap.

http://www.chemi-con.co.jp/e/catalog...g-e-080829.pdf

Also the KMG series is not snap in, It's standard radial.


Iv'e ordered some Nichcon replacements from rscomponents.

col.
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Old 11th February 2009, 08:33 AM   #80
Cristi is offline Cristi  Europe
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i bought about 100 pcs of that capacitors, so if i have them, i think they exist. there are many parts from diferent manufactures which are not listed in datasheets or other places. i also test them when i buy, just in case. some components can be discontinued after a wile or can be made for some special order, for a specific customer and they are not listed, and extra stock they sell.

i used for the boards only geniune parts, and i tested them before use, and they are according with the parameters stated in the datasheet
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