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PostPosted: 16 Oct 2009, 12:10 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
I like the Blue Velvets as well and use them all the time.
Cheers

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 25 Oct 2009, 23:28 
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Joined: 06 Jun 2008, 20:12
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Location: Houston, TX
I am going to suggest, with a warning, to remove C2. C2 stops DC from coming through and being amplified. Amplified DC is all sorts of suicide for your speakers. However, you might have no DC to amplify. So simply bypass C2 with your input signal and try it out. Watch your speakers cone when you turn on the amp. If it goes into excursion then you have a lot of DC and simply shut down the amp. Your speakers can handle this for a short time. If your cones do not go into excursion then measure with your DMM the DC offset at the speaker outputs from your amp. Of course, you could do this step first. If you have less than 100mV then feel free to listen to the new and improved sound. The C2 cap is very very important to sound quality. The best quality sound will be with it removed but its slightly dangerous. Its not dangerous enough to not try. If you like the sound best this way then leave it or if you like it a lot but are worried about DC then buy a very good cap for this position. I will bet a lot that this is your 'veiled' sound.
Uriah

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PostPosted: 26 Oct 2009, 05:57 
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Joined: 08 May 2009, 08:20
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Location: Duesseldorf, Germany
Hi folks,

this weekend, i received a feedback from an other amp builder, who used the original "ST Layout"

That "ST layout" is shown on the datasheet:
Figure 1: Split Supply Typical Application Circuit
Figure 2: P.C. Board and Components Layout of the Circuit of Figure 1 (1:1)
Attachment:
IMG_3353 copy 38.JPG
You can clearly see the etched pcbs. It is a very clean and fine build. It also can be viewed on: Thai DIY Audio.

Many thanks to Frank - that's great!


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Tom.

Some of my projects: TDA2050 Chip Amp, the LM3886 Gainclone Thread and the Szekeres Headamp Thread.


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PostPosted: 26 Oct 2009, 07:11 
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Very nice DIY amp!
Look at all that power supply for that tiny chip. Amazing.
Ri

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PostPosted: 26 Oct 2009, 18:58 
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Indeed, that is a very nice clean build.

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PostPosted: 27 Oct 2009, 08:54 
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Hi i'm building a TDA2050 x 4 audio power amplifier
See http://blog-j.homelinux.com/index.php/2 ... o-tda2050/ for pictures and diagram.


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PostPosted: 29 Oct 2009, 20:18 
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Hi Jose ;-)

Thanks a lot for sharing your project. It is a very interesting version. Also thanks for the schematic / circuit.

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Tom.

Some of my projects: TDA2050 Chip Amp, the LM3886 Gainclone Thread and the Szekeres Headamp Thread.


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PostPosted: 04 Nov 2009, 10:42 
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Joined: 04 Nov 2009, 01:45
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Hi Tom,
I'm very inspired by your project and is now about to build one myself!
Though I do have some questions for you:
Will the GBPC2510W diode bridge work for the PSU?
And would you prefer a 25k or 50k potentiometer?

Thanks in advance!

Love you project, really good instructions and nice finish :D


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PostPosted: 04 Nov 2009, 11:13 
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25k will probably be fine but I will let someone else answer that for sure.
The bridge is way over spec but is great and will do the job well.
Uriah

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PostPosted: 04 Nov 2009, 12:05 
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RiGuy wrote:
25k will probably be fine but I will let someone else answer that for sure.
The bridge is way over spec but is great and will do the job well.

Hi again, thanks for the quick answer. I'm thinking can't I build my own diode bridge? Just take 4 diodes and put them into a square, solder it up and you're done? Or that won't work?
If it does I'd be happy if know any fitting diodes?

Thanks in advance :)


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