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Old 21st January 2012, 03:47 PM   #4671
MiiB is online now MiiB  Denmark
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as always.. simple circuits sound best, but they may require good household to do so....
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Old 21st January 2012, 04:09 PM   #4672
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Yes, keep it simple AND clean.
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Old 21st January 2012, 04:34 PM   #4673
MiiB is online now MiiB  Denmark
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how is the mounting coming along....will you soon power it up..??
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Old 21st January 2012, 04:42 PM   #4674
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Quote:
Originally Posted by Joachim Gerhard View Post
Ok, now we have a clue that can even being done by children. Pick the circuit with the least component count. Bingo.... that is the holy grail.
Maybe I hear some sarcasm in there? But I cleared (by the people of ATL) to help you identify the current 'best' circuit, itís the attached one (circuit M in the file).
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File Type: png Area 51 - Circuit M.PNG (57.4 KB, 219 views)
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Old 21st January 2012, 04:47 PM   #4675
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Quote:
Originally Posted by FdW View Post
I would like a dual sided board, when home brew (single sided) you would do the bottom layer only and have one or two jumpers; otherwise they would go on the top side. Having two sides you would use the topside as a ground plane. How would that be?

The MKP's would be fine with me, but my say on capacitors should not be definite
Back from Saturday shopping
New Coldplay CD on the spinner.

I have increased the track size to 2mm
Still using the 5 mm foot print for 100nF Caps
I have added the top layer Ground plane
(This can be tied up to proper ground on any of the pins

For clarity I have removed the bottom layer cooper poor area
And added a few pads for the output capacitors

The only concern I have is the length of the (highlighted) darker track.

Edit time was about a couple of minutes if that so no problems in any changes

On the caps the 5 mm size may be a limit to what is available
If this was 22.5 there are 4 or 5 types of MKP caps available from the like of
Farnell.

Is not trouble at all to make any changes as I said before it is an honour to be here.

PS I could not use color as PDF size is 160Kb If you need any DXF Gerbers or such I will email
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File Type: pdf Paradise 2mm and ground plane.PDF (167.0 KB, 101 views)
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Old 21st January 2012, 05:01 PM   #4676
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Bksabath View Post
Back from Saturday shopping
New Coldplay CD on the spinner.

I have increased the track size to 2mm
Still using the 5 mm foot print for 100nF Caps
I have added the top layer Ground plane
(This can be tied up to proper ground on any of the pins

For clarity I have removed the bottom layer cooper poor area
And added a few pads for the output capacitors

The only concern I have is the length of the (highlighted) darker track.

Edit time was about a couple of minutes if that so no problems in any changes

On the caps the 5 mm size may be a limit to what is available
If this was 22.5 there are 4 or 5 types of MKP caps available from the like of
Farnell.

Is not trouble at all to make any changes as I said before it is an honour to be here.

PS I could not use color as PDF size is 160Kb If you need any DXF Gerbers or such I will email
Yes that is cool, all high frequency artifacts immediately shunted to the ground plane I am gone order lots of them
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Old 21st January 2012, 05:33 PM   #4677
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I like the layout better and better too. And all done by hand. For me it can be the bigger sized caps. You get them in PP quality.
No Frans, i had a gut feeling that it should be simple. I have nothing against children, quite the contrary, they have a lot of that we have lost and they are honest.
MiiB, i am running out of well matched transistors. The ones from Frans where very good but the ones from Reichelt did not match at all. I have now ordered some from Fairchild.
They invented the modern planar epitaxial transistor so i hope they have some pride left.
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Old 21st January 2012, 06:14 PM   #4678
RCruz is offline RCruz  Switzerland
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What can happen if I use 27r instead of 33r for the input emitter transistors ?
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Old 21st January 2012, 06:21 PM   #4679
RCruz is offline RCruz  Switzerland
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Another "noob" question.... In the central area of the pcb we have the leds that set voltage for the opamp.

The leds are identified by a small circle with two triangles in one of the legs... are these markings pointing to the anode (+) ?
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File Type: png LEDS.png (41.0 KB, 206 views)
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Old 21st January 2012, 06:31 PM   #4680
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The marking is the long leg.
27 Ohm is fine. Noise goes down, distortion goes up VERY little.
We had 20 Ohm in the beginning and that worked too.
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