TDA8920 TDA8924 By Connexelectronic, Opinions Please. - Page 2 - diyAudio
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Old 17th September 2009, 02:41 PM   #11
zog666 is offline zog666  Australia
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Hi,

I got 2 of these modules (purchased with Col) and just wired one up into an enclosure (a cheap "makeup" case from a discount shop) a few days ago.

I'm using it right now mainly with an Alien DAC (or the TV) and an passive attenuator/input switcher (Wanfai Lau ebay kit).. so no op amps, pre amps etc between the PCM2702 DAC and the TDA8920 power amp. Speakers are Alesis Monitor Ones., - also tried with JPW Sonatas (entry level English bookshelf speakers).

So far it sounds great, and I like how it runs cool with low power use compared to my ART SLA-1 Class B power amp.
There is definately a different sound between the 2 amps but I'm hard pressed to say which is better.

Using the Alien Dac there is a bit of noise(sizzle), but only noticable if I put my head next to the speakers when silent, its not audible away from the speakers. Using a NAD 5420 cd player (and some other sources) this low noise goes away, I guess its as I am using a fairly quiet source powered from PC straight into an all passive, non buffering "pre-amp", which also has other noisy devices (plasma TV, cheap DVD player) plugged into the other inputs.

So far this is a win.. due to the low power usage. My Jaycar power meter shows it using 0 watts when silent and 5 watts at medium volume.. compared to the ART SLA-1which is more silent electrically but has a cooling fan (noise) and uses 25W when silent.

Once I get a good pic I'll put a pic of my cheapster enclosure in the Class D picture thread.
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Old 20th September 2009, 03:56 AM   #12
zog666 is offline zog666  Australia
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Quote:
Originally Posted by zog666 View Post
Hi,

Once I get a good pic I'll put a pic of my cheapster enclosure in the Class D picture thread.
done.. pictures added.
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Old 14th October 2009, 12:41 PM   #13
zog666 is offline zog666  Australia
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just a further update, after various experiments with different grounding schemes with my Connex TDA8920, I found it was dead quiet disconnecting mains ground. Of course this is not safe long term so I have implemented the ground loop breaker circuit as described here: on Cols suggestion and now the amp is VERY quiet.

On continued listening (still using Alesis Monitor One speakers) I'll class this now as audiophile grade for sure.
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Old 14th October 2009, 09:55 PM   #14
col is offline col  Australia
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Default TDA892x Amp V2

I recently received a V2 board, quite a bit smaller. Iv'e got it into an temporary enclosure made from a PC PSU. It's also dead quite and sounds great.

TDA892x Amp V2

col.
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Old 11th January 2010, 07:42 AM   #15
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Default 8950th

I have bought 10 pcs of 8950TH v2 boards. I will use 2 boards for my main setup, and probably 2 a second setup.

The rest will be bought from other. The project will be posted on HIFI4ALL.DK | Magasin om HiFi, Hi-Fi, Surround Sound og Audio Video but thats in danish. I will also give feedback here.
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Old 11th January 2010, 10:46 AM   #16
authlxl is offline authlxl  China
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I also made amp and SMPS module for TDA8950.schematic here ,If anybody like ,please do it youself.If you have any question please ask me by mail.I have made lots of modules use tda8922 tda8920BTH TDA8950B,now NXP new class d chip TDA8953.TDA8954,high power out.but I still no time try it.
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Last edited by authlxl; 11th January 2010 at 11:05 AM.
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Old 11th January 2010, 11:31 AM   #17
authlxl is offline authlxl  China
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Default Tda8950 pcb photo

Upload pic here,I have compare many time,tda8920/50 fit for bass,TI TAS5630 fit for full rage.
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Last edited by authlxl; 11th January 2010 at 11:46 AM.
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Old 13th January 2010, 05:16 AM   #18
authlxl is offline authlxl  China
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I have compare many times,tda8920BJ sound better than tda8920bth,but tda8920bj difficult fit together.
Must careful if you add smps and tda8920 in one board,there always have hiss noise background.you must separate AGND and PGND .
few years ago ,I use TOP261YN and tda8920BTH design one module for combo powered mixer,it waste me lots of time to deal with this problem。I design 4 version PCB ,I work this out at last.
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Old 14th January 2010, 12:29 AM   #19
authlxl is offline authlxl  China
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Now I get TDA8954 ,It's more powerful,TI TAS5630 deliver out 2*300W/4Ω,this chip can deliver out 2*210w/4Ω.
Specification:
SE 2 210 W, RL = 4 Ω (VDD = 41 V; VSS = −41 V)
SE 2 235 W, RL = 3 Ω (VDD = 39 V; VSS = −39 V)
SE 2 150 W, RL = 6 Ω (VDD = 41 V; VSS = −41 V)
BTL 1 420 W, RL = 8 Ω (VDD = 41 V; VSS = −41 V)

High output power in typical applications:
Symmetrical operating supply voltage range from
Stereo full differential inputs, can be used
as stereo SE or mono BTL amplifier
Low noise
Smooth pop noise-free start-up and switch off
2-pin diagnostics for protection circuits
Fixed frequency internal or external clock
High efficiency 93 %
Zero dead time switching
Low quiescent current
Advanced protection strategy: voltage protection and output current limiting
Thermal FoldBack (TFB) with disable functionality
Fixed gain of 30dB in SE and 36dB in BTL applications
Fully short-circuit proof across load
BD modulation in BTL configuration
Clock protection
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Old 14th January 2010, 12:52 AM   #20
authlxl is offline authlxl  China
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Default tda8954 module debugging

I have finished PCB,now debuging,It can deliver out 200W indeed,but I alway use it for BTL mode,it can deliver out 400W/8Ω.
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