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PostPosted: 30 Nov 2011, 06:43 
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Grega: That looks tops.You make me feel so last millennia. I'm still hooking wire-2-wire. Keep us informed. I see you are expanding your carbon foot print. Carbon's good as blockers on thre grid but I would move to metal on the others. Still some like the sound of carbon.

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PostPosted: 30 Nov 2011, 13:28 
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Some of my projects: TDA2050 Chip Amp, the LM3886 Gainclone Thread and the Szekeres Headamp Thread.


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PostPosted: 30 Nov 2011, 13:46 
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heres the top side :)
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i couldn't sleep to save me so, yeah now designing the PSU circuit mark :)
i made one major change to the layout in that the ground which goes around the outside was too close to the POT connections - as you will see in the above pic. also i had to bridge a bit of solder on the GND rail as i left this one etching a little too long ;)

noted : re teh carbon vs the metal. thanks for that. i tend to use carbon for most - although didn't when i did the unbalanced-balanced LM833.

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PostPosted: 30 Nov 2011, 13:47 
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ps: thanks tom for the emoticons :)

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PostPosted: 30 Nov 2011, 19:56 
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Grega;

I see something on your PC board that has me a little concerned. It appears that you have a signal line passing directly between pins 4 and 5 of the socket. If the filament wires are fed in from the component side of the board then that signal line will be passing directly through the filament current loop. In effect the signal line will be inductively coupled to the filament circuit.

If the filament is fed with dc this should not be much of a problem. However, if the filament is fed with AC then you'll be pumping 50Hz directly into the signal line. On a future modification of the board, I would suggest you change this.

However, the board does look wicked good. :twisted: Where can I get one?

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PostPosted: 30 Nov 2011, 23:43 
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Matt - thank you for the feedback. Yes pins 4 & 5 will get 12vdc from the psu circuit, the wires that will go there will be twisted and not actually run on the cct board at all, however their proximity to pins 3 and 7 concerned me also - but will give it a run and see how we go

I have finished the PSU board which I will show you in a tic also

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PostPosted: 01 Dec 2011, 01:57 
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topside
Image

bottomside
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enjoy
oh matt - if you want a board - i will etch one for you next time i am etching :) let me know, will etch and put in the snail mail

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PostPosted: 01 Dec 2011, 05:36 
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Suncalc wrote:
Grega;

I see something on your PC board that has me a little concerned. It appears that you have a signal line passing directly between pins 4 and 5 of the socket. If the filament wires are fed in from the component side of the board then that signal line will be passing directly through the filament current loop. In effect the signal line will be inductively coupled to the filament circuit.

If the filament is fed with dc this should not be much of a problem. However, if the filament is fed with AC then you'll be pumping 50Hz directly into the signal line. On a future modification of the board, I would suggest you change this.

However, the board does look wicked good. :twisted: Where can I get one?

The eye of the Owl. You've been served.

I wouldn't get to upset about it. And that's the difference between a technician and an engineer. Of course Matt is right. No silly techy would dispute that. We may oppose a change but would I change it? No. This is also an Australian talking where our credos is "she'll be right mate". Try it as is. If it sinks make the changes Matt has suggested, if it floats leave it as is. But as with all audio gear it can be improved and that is what Matt was suggesting, an improvement.

Nice brd. but.

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PostPosted: 01 Dec 2011, 06:25 
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or, from an IT Architects perspective Mark, its a change in the requirements --> which means a PCR is needed :)

all good - will try as is - see how we go :)
like you say - if it sinks - v2 will come along :)

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PostPosted: 01 Dec 2011, 06:30 
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Grega wrote:
or, from an IT Architects perspective Mark, its a change in the requirements --> which means a PCR is needed :)

all good - will try as is - see how we go :)
like you say - if it sinks - v2 will come along :)

That's my boy.

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