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PostPosted: 09 Nov 2009, 13:59 
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tombethe wrote:


Hm..the last one doesn't look some complicated. Is there any alternatives to the transistors, since I got everything except them in my box?

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PostPosted: 09 Nov 2009, 17:56 
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Location: Duesseldorf, Germany
Hej Olof,

there are some alternatives (standard small-signal transistors) that could be used:
2N5551 // 2N3904 // 2N5401 // BC337-40 // MPSA06.
I think that this 2N5551 should be a good choice. It works very good on the Baxandall t-stack from A. Collins (Zen UK).
I couldn't measure the circuit until now, but i have the good feeling that they are fine.

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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: 10 Nov 2009, 13:33 
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Cheers,
I'm gonna finish the amp and psu circuits then I'll see how I do with the eq!

Here is a little sneak peek on amp circuit, my mom had to adjust the toner tranfer paper which messed up the TDA2050, that's why it's a little bit crooked. :P

Otherwise I think it looks OK for a first time etching!

Cheers,
Olof

Image
Image


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PostPosted: 10 Nov 2009, 15:34 
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Joined: 06 Jun 2008, 20:12
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Location: Houston, TX
Olof,
Your Mom even does the ironing on your boards!! :D
Love it.
Ri

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PostPosted: 10 Nov 2009, 17:48 
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Hej Olof,

congrats :up: It doesn't look bad! I just remembered that my first diy boards went totally wrong. Don't despair - the next boards are like paintings ;-)

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Cheers,
Tom.

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


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PostPosted: 10 Nov 2009, 18:24 
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Good stuff, way to get mom involved. DIY Audio is for everyone! ;)

Yep, don't forget you will need to attach the chip to a heat sink. So if you can get the chip near the edge of the PCB it will be easier to mount.
Cheers

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PostPosted: 10 Nov 2009, 19:00 
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Just an other way to mount coolers if you can't mount them close to the ICs. Just use a U-shaped piece of aluminium, large enough to connect it to the IC and the cooler... Don't forget to isolate the chip fom the cooler / alu bar..
Attachment:
cooler_conn.GIF


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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: 10 Nov 2009, 19:26 
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Nice trick :)

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PostPosted: 11 Nov 2009, 11:06 
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Cheers guys,
I made a new one without moms help :P and I'm very pleased with the result!

Image

Image

Alright, she did the ironing, nothing else :blush:

All I need to do is to add C7 then I suppose it's done? or is there any faults?


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PostPosted: 11 Nov 2009, 16:29 
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Hi again,

I just finished building the power supply and it did not explode ;) but the thing is that when I measure between V- and GND my multimeter says 0,00V. But when I measure between V+ and GND I get +26V!

Why is it like this?

Thanks in advance,
Olof

PS! I use 4x4700uF caps. 2 in parallell.


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